Merge branch 'master' of /home/stefan/git/u-boot/u-boot

Makefile

@@ -210,7 +210,7 @@ LIBS += cpu/ixp/npe/libnpe.a
 endif
 LIBS += lib_$(ARCH)/lib$(ARCH).a
 LIBS += fs/cramfs/libcramfs.a fs/fat/libfat.a fs/fdos/libfdos.a fs/jffs2/libjffs2.a \
-	fs/reiserfs/libreiserfs.a fs/ext2/libext2fs.a
+	fs/reiserfs/libreiserfs.a fs/ext2/libext2fs.a fs/yaffs2/libyaffs2.a
 LIBS += net/libnet.a
 LIBS += disk/libdisk.a
 LIBS += drivers/bios_emulator/libatibiosemu.a
@@ -378,6 +378,7 @@ TAG_SUBDIRS += fs/cramfs
 TAG_SUBDIRS += fs/fat
 TAG_SUBDIRS += fs/fdos
 TAG_SUBDIRS += fs/jffs2
+TAG_SUBDIRS += fs/yaffs2
 TAG_SUBDIRS += net
 TAG_SUBDIRS += disk
 TAG_SUBDIRS += common
@@ -2010,8 +2011,11 @@ TASREG_config :		unconfig
 #########################################################################
 
 MPC8313ERDB_33_config \
-MPC8313ERDB_66_config: unconfig
+MPC8313ERDB_66_config \
+MPC8313ERDB_NAND_33_config \
+MPC8313ERDB_NAND_66_config: unconfig
 	@mkdir -p $(obj)include
+	@mkdir -p $(obj)board/freescale/mpc8313erdb
 	@if [ "$(findstring _33_,$@)" ] ; then \
 		$(XECHO) -n "...33M ..." ; \
 		echo "#define CFG_33MHZ" >>$(obj)include/config.h ; \
@@ -2019,6 +2023,11 @@ MPC8313ERDB_66_config: unconfig
 	if [ "$(findstring _66_,$@)" ] ; then \
 		$(XECHO) -n "...66M..." ; \
 		echo "#define CFG_66MHZ" >>$(obj)include/config.h ; \
+	fi ; \
+	if [ "$(findstring _NAND_,$@)" ] ; then \
+		$(XECHO) -n "...NAND..." ; \
+		echo "TEXT_BASE = 0x00100000" > $(obj)/board/freescale/mpc8313erdb/config.tmp ; \
+		echo "#define CONFIG_NAND_U_BOOT" >>$(obj)include/config.h ; \
 	fi ;
 	@$(MKCONFIG) -a MPC8313ERDB ppc mpc83xx mpc8313erdb freescale
 
@@ -2368,13 +2377,13 @@ at91rm9200dk_config	:	unconfig
 	@$(MKCONFIG) $(@:_config=) arm arm920t at91rm9200dk atmel at91rm9200
 
 at91sam9261ek_config	:	unconfig
-	@$(MKCONFIG) $(@:_config=) arm arm926ejs at91sam9261ek atmel at91sam9
+	@$(MKCONFIG) $(@:_config=) arm arm926ejs at91sam9261ek atmel at91
 
 at91sam9263ek_config	:	unconfig
-	@$(MKCONFIG) $(@:_config=) arm arm926ejs at91sam9263ek atmel at91sam9
+	@$(MKCONFIG) $(@:_config=) arm arm926ejs at91sam9263ek atmel at91
 
 at91sam9rlek_config	:	unconfig
-	@$(MKCONFIG) $(@:_config=) arm arm926ejs at91sam9rlek atmel at91sam9
+	@$(MKCONFIG) $(@:_config=) arm arm926ejs at91sam9rlek atmel at91
 
 cmc_pu2_config	:	unconfig
 	@$(MKCONFIG) $(@:_config=) arm arm920t cmc_pu2 NULL at91rm9200
@@ -2396,10 +2405,10 @@ mp2usb_config	:	unconfig
 #########################################################################
 
 at91cap9adk_config	:	unconfig
-	@$(MKCONFIG) $(@:_config=) arm arm926ejs at91cap9adk atmel at91sam9
+	@$(MKCONFIG) $(@:_config=) arm arm926ejs at91cap9adk atmel at91
 
 at91sam9260ek_config	:	unconfig
-	@$(MKCONFIG) $(@:_config=) arm arm926ejs at91sam9260ek atmel at91sam9
+	@$(MKCONFIG) $(@:_config=) arm arm926ejs at91sam9260ek atmel at91
 
 ########################################################################
 ## ARM Integrator boards - see doc/README-integrator for more info.

board/bf537-stamp/nand.c

@@ -37,34 +37,29 @@
 /*
  * hardware specific access to control-lines
  */
-static void bfin_hwcontrol(struct mtd_info *mtd, int cmd)
+static void bfin_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 {
 	register struct nand_chip *this = mtd->priv;
+	u32 IO_ADDR_W = (u32) this->IO_ADDR_W;
 
-	switch (cmd) {
-
-	case NAND_CTL_SETCLE:
-		this->IO_ADDR_W = CFG_NAND_BASE + BFIN_NAND_CLE;
-		break;
-	case NAND_CTL_CLRCLE:
-		this->IO_ADDR_W = CFG_NAND_BASE;
-		break;
-
-	case NAND_CTL_SETALE:
-		this->IO_ADDR_W = CFG_NAND_BASE + BFIN_NAND_ALE;
-		break;
-	case NAND_CTL_CLRALE:
-		this->IO_ADDR_W = CFG_NAND_BASE;
-		break;
-	case NAND_CTL_SETNCE:
-	case NAND_CTL_CLRNCE:
-		break;
+	if (ctrl & NAND_CTRL_CHANGE) {
+		if( ctrl & NAND_CLE )
+			IO_ADDR_W = CFG_NAND_BASE + BFIN_NAND_CLE;
+		else
+			IO_ADDR_W = CFG_NAND_BASE;
+		if( ctrl & NAND_ALE )
+			IO_ADDR_W = CFG_NAND_BASE + BFIN_NAND_ALE;
+		else
+			IO_ADDR_W = CFG_NAND_BASE;
+		this->IO_ADDR_W = (void __iomem *) IO_ADDR_W;
 	}
-
 	this->IO_ADDR_R = this->IO_ADDR_W;
 
 	/* Drain the writebuffer */
 	SSYNC();
+
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, this->IO_ADDR_W);
 }
 
 int bfin_device_ready(struct mtd_info *mtd)
@@ -79,11 +74,11 @@ int bfin_device_ready(struct mtd_info *mtd)
  * argument are board-specific (per include/linux/mtd/nand.h):
  * - IO_ADDR_R?: address to read the 8 I/O lines of the flash device
  * - IO_ADDR_W?: address to write the 8 I/O lines of the flash device
- * - hwcontrol: hardwarespecific function for accesing control-lines
+ * - cmd_ctrl: hardwarespecific function for accesing control-lines
  * - dev_ready: hardwarespecific function for  accesing device ready/busy line
  * - enable_hwecc?: function to enable (reset)  hardware ecc generator. Must
  *   only be provided if a hardware ECC is available
- * - eccmode: mode of ecc, see defines
+ * - ecc.mode: mode of ecc, see defines
  * - chip_delay: chip dependent delay for transfering data from array to
  *   read regs (tR)
  * - options: various chip options. They can partly be set to inform
@@ -98,8 +93,8 @@ void board_nand_init(struct nand_chip *nand)
 	*PORT(CONFIG_NAND_GPIO_PORT, IO_DIR) &= ~BFIN_NAND_READY;
 	*PORT(CONFIG_NAND_GPIO_PORT, IO_INEN) |= BFIN_NAND_READY;
 
-	nand->hwcontrol = bfin_hwcontrol;
-	nand->eccmode = NAND_ECC_SOFT;
+	nand->cmd_ctrl = bfin_hwcontrol;
+	nand->ecc.mode = NAND_ECC_SOFT;
 	nand->dev_ready = bfin_device_ready;
 	nand->chip_delay = 30;
 }

board/dave/PPChameleonEVB/nand.c

@@ -21,7 +21,7 @@
  */
 
 #include <common.h>
-
+#include <asm/io.h>
 
 #if defined(CONFIG_CMD_NAND)
 
@@ -31,31 +31,28 @@
  * hardware specific access to control-lines
  * function borrowed from Linux 2.6 (drivers/mtd/nand/ppchameleonevb.c)
  */
-static void ppchameleonevb_hwcontrol(struct mtd_info *mtdinfo, int cmd)
+static void ppchameleonevb_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 {
-	struct nand_chip *this = mtdinfo->priv;
+	struct nand_chip *this = mtd->priv;
 	ulong base = (ulong) this->IO_ADDR_W;
 
-	switch(cmd) {
-	case NAND_CTL_SETCLE:
-		MACRO_NAND_CTL_SETCLE((unsigned long)base);
-		break;
-	case NAND_CTL_CLRCLE:
-		MACRO_NAND_CTL_CLRCLE((unsigned long)base);
-		break;
-	case NAND_CTL_SETALE:
-		MACRO_NAND_CTL_SETALE((unsigned long)base);
-		break;
-	case NAND_CTL_CLRALE:
-		MACRO_NAND_CTL_CLRALE((unsigned long)base);
-		break;
-	case NAND_CTL_SETNCE:
-		MACRO_NAND_ENABLE_CE((unsigned long)base);
-		break;
-	case NAND_CTL_CLRNCE:
-		MACRO_NAND_DISABLE_CE((unsigned long)base);
-		break;
+	if (ctrl & NAND_CTRL_CHANGE) {
+		if ( ctrl & NAND_CLE )
+			MACRO_NAND_CTL_SETCLE((unsigned long)base);
+		else
+			MACRO_NAND_CTL_CLRCLE((unsigned long)base);
+		if ( ctrl & NAND_ALE )
+			MACRO_NAND_CTL_CLRCLE((unsigned long)base);
+		else
+			MACRO_NAND_CTL_CLRALE((unsigned long)base);
+		if ( ctrl & NAND_NCE )
+			MACRO_NAND_ENABLE_CE((unsigned long)base);
+		else
+			MACRO_NAND_DISABLE_CE((unsigned long)base);
 	}
+
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, this->IO_ADDR_W);
 }
 
 
@@ -92,11 +89,11 @@ static int ppchameleonevb_device_ready(struct mtd_info *mtdinfo)
  * argument are board-specific (per include/linux/mtd/nand.h):
  * - IO_ADDR_R?: address to read the 8 I/O lines of the flash device
  * - IO_ADDR_W?: address to write the 8 I/O lines of the flash device
- * - hwcontrol: hardwarespecific function for accesing control-lines
+ * - cmd_ctrl: hardwarespecific function for accesing control-lines
  * - dev_ready: hardwarespecific function for  accesing device ready/busy line
  * - enable_hwecc?: function to enable (reset)  hardware ecc generator. Must
  *   only be provided if a hardware ECC is available
- * - eccmode: mode of ecc, see defines
+ * - ecc.mode: mode of ecc, see defines
  * - chip_delay: chip dependent delay for transfering data from array to
  *   read regs (tR)
  * - options: various chip options. They can partly be set to inform
@@ -108,9 +105,9 @@ static int ppchameleonevb_device_ready(struct mtd_info *mtdinfo)
 int board_nand_init(struct nand_chip *nand)
 {
 
-	nand->hwcontrol = ppchameleonevb_hwcontrol;
+	nand->cmd_ctrl = ppchameleonevb_hwcontrol;
 	nand->dev_ready = ppchameleonevb_device_ready;
-	nand->eccmode = NAND_ECC_SOFT;
+	nand->ecc.mode = NAND_ECC_SOFT;
 	nand->chip_delay = NAND_BIG_DELAY_US;
 	nand->options = NAND_SAMSUNG_LP_OPTIONS;
 	return 0;

board/delta/nand.c

@@ -69,7 +69,7 @@ static struct nand_oobinfo delta_oob = {
 /*
  * not required for Monahans DFC
  */
-static void dfc_hwcontrol(struct mtd_info *mtdinfo, int cmd)
+static void dfc_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 {
 	return;
 }
@@ -110,30 +110,6 @@ static void dfc_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
 }
 
 
-/*
- * These functions are quite problematic for the DFC. Luckily they are
- * not used in the current nand code, except for nand_command, which
- * we've defined our own anyway. The problem is, that we always need
- * to write 4 bytes to the DFC Data Buffer, but in these functions we
- * don't know if to buffer the bytes/half words until we've gathered 4
- * bytes or if to send them straight away.
- *
- * Solution: Don't use these with Mona's DFC and complain loudly.
- */
-static void dfc_write_word(struct mtd_info *mtd, u16 word)
-{
-	printf("dfc_write_word: WARNING, this function does not work with the Monahans DFC!\n");
-}
-static void dfc_write_byte(struct mtd_info *mtd, u_char byte)
-{
-	printf("dfc_write_byte: WARNING, this function does not work with the Monahans DFC!\n");
-}
-
-/* The original:
- * static void dfc_read_buf(struct mtd_info *mtd, const u_char *buf, int len)
- *
- * Shouldn't this be "u_char * const buf" ?
- */
 static void dfc_read_buf(struct mtd_info *mtd, u_char* const buf, int len)
 {
 	int i=0, j;
@@ -168,7 +144,7 @@ static void dfc_read_buf(struct mtd_info *mtd, u_char* const buf, int len)
  */
 static u16 dfc_read_word(struct mtd_info *mtd)
 {
-	printf("dfc_write_byte: UNIMPLEMENTED.\n");
+	printf("dfc_read_word: UNIMPLEMENTED.\n");
 	return 0;
 }
 
@@ -289,9 +265,10 @@ static void dfc_new_cmd(void)
 
 /* this function is called after Programm and Erase Operations to
  * check for success or failure */
-static int dfc_wait(struct mtd_info *mtd, struct nand_chip *this, int state)
+static int dfc_wait(struct mtd_info *mtd, struct nand_chip *this)
 {
 	unsigned long ndsr=0, event=0;
+	int state = this->state;
 
 	if(state == FL_WRITING) {
 		event = NDSR_CS0_CMDD | NDSR_CS0_BBD;
@@ -439,7 +416,7 @@ static void dfc_gpio_init(void)
  * - dev_ready: hardwarespecific function for  accesing device ready/busy line
  * - enable_hwecc?: function to enable (reset)  hardware ecc generator. Must
  *   only be provided if a hardware ECC is available
- * - eccmode: mode of ecc, see defines
+ * - ecc.mode: mode of ecc, see defines
  * - chip_delay: chip dependent delay for transfering data from array to
  *   read regs (tR)
  * - options: various chip options. They can partly be set to inform
@@ -561,20 +538,18 @@ int board_nand_init(struct nand_chip *nand)
 	/*	wait(10); */
 
 
-	nand->hwcontrol = dfc_hwcontrol;
+	nand->cmd_ctrl = dfc_hwcontrol;
 /*	nand->dev_ready = dfc_device_ready; */
-	nand->eccmode = NAND_ECC_SOFT;
+	nand->ecc.mode = NAND_ECC_SOFT;
 	nand->options = NAND_BUSWIDTH_16;
 	nand->waitfunc = dfc_wait;
 	nand->read_byte = dfc_read_byte;
-	nand->write_byte = dfc_write_byte;
 	nand->read_word = dfc_read_word;
-	nand->write_word = dfc_write_word;
 	nand->read_buf = dfc_read_buf;
 	nand->write_buf = dfc_write_buf;
 
 	nand->cmdfunc = dfc_cmdfunc;
-	nand->autooob = &delta_oob;
+/*	nand->autooob = &delta_oob; */
 	nand->badblock_pattern = &delta_bbt_descr;
 	return 0;
 }

board/esd/common/esd405ep_nand.c

@@ -30,28 +30,26 @@
 /*
  * hardware specific access to control-lines
  */
-static void esd405ep_nand_hwcontrol(struct mtd_info *mtdinfo, int cmd)
+static void esd405ep_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 {
-	switch(cmd) {
-	case NAND_CTL_SETCLE:
-		out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) | CFG_NAND_CLE);
-		break;
-	case NAND_CTL_CLRCLE:
-		out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) & ~CFG_NAND_CLE);
-		break;
-	case NAND_CTL_SETALE:
-		out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) | CFG_NAND_ALE);
-		break;
-	case NAND_CTL_CLRALE:
-		out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) & ~CFG_NAND_ALE);
-		break;
-	case NAND_CTL_SETNCE:
-		out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) & ~CFG_NAND_CE);
-		break;
-	case NAND_CTL_CLRNCE:
-		out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) | CFG_NAND_CE);
-		break;
+	struct nand_chip *this = mtd->priv;
+	if (ctrl & NAND_CTRL_CHANGE) {
+		if ( ctrl & NAND_CLE )
+			out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) | CFG_NAND_CLE);
+		else
+			out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) & ~CFG_NAND_CLE);
+		if ( ctrl & NAND_ALE )
+			out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) | CFG_NAND_ALE);
+		else
+			out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) & ~CFG_NAND_ALE);
+		if ( ctrl & NAND_NCE )
+			out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) & ~CFG_NAND_CE);
+		else
+			out_be32((void *)GPIO0_OR, in_be32((void *)GPIO0_OR) | CFG_NAND_CE);
 	}
+
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, this->IO_ADDR_W);
 }
 
 
@@ -77,9 +75,9 @@ int board_nand_init(struct nand_chip *nand)
 	/*
 	 * Initialize nand_chip structure
 	 */
-	nand->hwcontrol = esd405ep_nand_hwcontrol;
+	nand->cmd_ctrl = esd405ep_nand_hwcontrol;
 	nand->dev_ready = esd405ep_nand_device_ready;
-	nand->eccmode = NAND_ECC_SOFT;
+	nand->ecc.mode = NAND_ECC_SOFT;
 	nand->chip_delay = NAND_BIG_DELAY_US;
 	nand->options = NAND_SAMSUNG_LP_OPTIONS;
 	return 0;

board/freescale/m5329evb/nand.c

@@ -40,36 +40,26 @@ DECLARE_GLOBAL_DATA_PTR;
 #define SET_ALE		0x08
 #define CLR_ALE		~SET_ALE
 
-static void nand_hwcontrol(struct mtd_info *mtdinfo, int cmd)
+static void nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 {
 	struct nand_chip *this = mtdinfo->priv;
-	volatile fbcs_t *fbcs = (fbcs_t *) MMAP_FBCS;
+/*	volatile fbcs_t *fbcs = (fbcs_t *) MMAP_FBCS; TODO: handle wp */
 	u32 nand_baseaddr = (u32) this->IO_ADDR_W;
 
-	switch (cmd) {
-	case NAND_CTL_SETNCE:
-	case NAND_CTL_CLRNCE:
-		break;
-	case NAND_CTL_SETCLE:
-		nand_baseaddr |= SET_CLE;
-		break;
-	case NAND_CTL_CLRCLE:
-		nand_baseaddr &= CLR_CLE;
-		break;
-	case NAND_CTL_SETALE:
-		nand_baseaddr |= SET_ALE;
-		break;
-	case NAND_CTL_CLRALE:
-		nand_baseaddr |= CLR_ALE;
-		break;
-	case NAND_CTL_SETWP:
-		fbcs->csmr2 |= FBCS_CSMR_WP;
-		break;
-	case NAND_CTL_CLRWP:
-		fbcs->csmr2 &= ~FBCS_CSMR_WP;
-		break;
+	if (ctrl & NAND_CTRL_CHANGE) {
+		if ( ctrl & NAND_CLE )
+			nand_baseaddr |= SET_CLE;
+		else
+			nand_baseaddr &= CLR_CLE;
+		if ( ctrl & NAND_ALE )
+			nand_baseaddr |= SET_ALE;
+		else
+			nand_baseaddr &= CLR_ALE;
 	}
 	this->IO_ADDR_W = (void __iomem *)(nand_baseaddr);
+
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, this->IO_ADDR_W);
 }
 
 static void nand_write_byte(struct mtd_info *mtdinfo, u_char byte)
@@ -103,8 +93,8 @@ int board_nand_init(struct nand_chip *nand)
 	gpio->podr_timer = 0;
 
 	nand->chip_delay = 50;
-	nand->eccmode = NAND_ECC_SOFT;
-	nand->hwcontrol = nand_hwcontrol;
+	nand->ecc.mode = NAND_ECC_SOFT;
+	nand->cmd_ctrl = nand_hwcontrol;
 	nand->read_byte = nand_read_byte;
 	nand->write_byte = nand_write_byte;
 	nand->dev_ready = nand_dev_ready;

board/freescale/mpc8313erdb/config.mk

@@ -1 +1,7 @@
+ifndef NAND_SPL
+sinclude $(OBJTREE)/board/$(BOARDDIR)/config.tmp
+endif
+
+ifndef TEXT_BASE
 TEXT_BASE = 0xFE000000
+endif

board/freescale/mpc8313erdb/mpc8313erdb.c

@@ -29,6 +29,8 @@
 #include <pci.h>
 #include <mpc83xx.h>
 #include <vsc7385.h>
+#include <ns16550.h>
+#include <nand.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -50,6 +52,7 @@ int checkboard(void)
 	return 0;
 }
 
+#ifndef CONFIG_NAND_SPL
 static struct pci_region pci_regions[] = {
 	{
 		bus_start: CFG_PCI1_MEM_BASE,
@@ -128,3 +131,32 @@ void ft_board_setup(void *blob, bd_t *bd)
 #endif
 }
 #endif
+#else /* CONFIG_NAND_SPL */
+void board_init_f(ulong bootflag)
+{
+	board_early_init_f();
+	NS16550_init((NS16550_t)(CFG_IMMR + 0x4500),
+	             CFG_NS16550_CLK / 16 / CONFIG_BAUDRATE);
+	puts("NAND boot... ");
+	init_timebase();
+	initdram(0);
+	relocate_code(CFG_NAND_U_BOOT_RELOC + 0x10000, (gd_t *)gd,
+	              CFG_NAND_U_BOOT_RELOC);
+}
+
+void board_init_r(gd_t *gd, ulong dest_addr)
+{
+	nand_boot();
+}
+
+void putc(char c)
+{
+	if (gd->flags & GD_FLG_SILENT)
+		return;
+
+	if (c == '\n')
+		NS16550_putc((NS16550_t)(CFG_IMMR + 0x4500), '\r');
+
+	NS16550_putc((NS16550_t)(CFG_IMMR + 0x4500), c);
+}
+#endif

board/freescale/mpc8313erdb/sdram.c

@@ -58,8 +58,10 @@ static void resume_from_sleep(void)
  */
 static long fixed_sdram(void)
 {
-	volatile immap_t *im = (volatile immap_t *)CFG_IMMR;
 	u32 msize = CFG_DDR_SIZE * 1024 * 1024;
+
+#ifndef CFG_RAMBOOT
+	volatile immap_t *im = (volatile immap_t *)CFG_IMMR;
 	u32 msize_log2 = __ilog2(msize);
 
 	im->sysconf.ddrlaw[0].bar = CFG_DDR_SDRAM_BASE >> 12;
@@ -100,6 +102,7 @@ static long fixed_sdram(void)
 
 	/* enable DDR controller */
 	im->ddr.sdram_cfg |= SDRAM_CFG_MEM_EN;
+#endif
 
 	return msize;
 }

board/nc650/nand.c

@@ -22,7 +22,7 @@
  */
 
 #include <common.h>
-
+#include <asm/io.h>
 
 #if defined(CONFIG_CMD_NAND)
 
@@ -32,57 +32,49 @@
 /*
  *	hardware specific access to control-lines
  */
-static void nc650_hwcontrol(struct mtd_info *mtd, int cmd)
+static void nc650_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 {
 	struct nand_chip *this = mtd->priv;
 
-	switch(cmd) {
-	case NAND_CTL_SETCLE:
-		this->IO_ADDR_W += 2;
-		break;
-	case NAND_CTL_CLRCLE:
-		this->IO_ADDR_W -= 2;
-		break;
-	case NAND_CTL_SETALE:
-		this->IO_ADDR_W += 1;
-		break;
-	case NAND_CTL_CLRALE:
-		this->IO_ADDR_W -= 1;
-		break;
-	case NAND_CTL_SETNCE:
-	case NAND_CTL_CLRNCE:
-		/* nop */
-		break;
+	if (ctrl & NAND_CTRL_CHANGE) {
+		if ( ctrl & NAND_CLE )
+			this->IO_ADDR_W += 2;
+		else
+			this->IO_ADDR_W -= 2;
+		if ( ctrl & NAND_ALE )
+			this->IO_ADDR_W += 1;
+		else
+			this->IO_ADDR_W -= 1;
 	}
+
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, this->IO_ADDR_W);
 }
 #elif defined(CONFIG_IDS852_REV2)
 /*
  *	hardware specific access to control-lines
  */
-static void nc650_hwcontrol(struct mtd_info *mtd, int cmd)
+static void nc650_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 {
 	struct nand_chip *this = mtd->priv;
 
-	switch(cmd) {
-	case NAND_CTL_SETCLE:
-		*(((volatile __u8 *) this->IO_ADDR_W) + 0xa) = 0;
-		break;
-	case NAND_CTL_CLRCLE:
-		*(((volatile __u8 *) this->IO_ADDR_W) + 0x8) = 0;
-		break;
-	case NAND_CTL_SETALE:
-		*(((volatile __u8 *) this->IO_ADDR_W) + 0x9) = 0;
-		break;
-	case NAND_CTL_CLRALE:
-		*(((volatile __u8 *) this->IO_ADDR_W) + 0x8) = 0;
-		break;
-	case NAND_CTL_SETNCE:
-		*(((volatile __u8 *) this->IO_ADDR_W) + 0x8) = 0;
-		break;
-	case NAND_CTL_CLRNCE:
-		*(((volatile __u8 *) this->IO_ADDR_W) + 0xc) = 0;
-		break;
+	if (ctrl & NAND_CTRL_CHANGE) {
+		if ( ctrl & NAND_CLE )
+			writeb(0, (volatile __u8 *) this->IO_ADDR_W + 0xa);
+		else
+			writeb(0, (volatile __u8 *) this->IO_ADDR_W) + 0x8);
+		if ( ctrl & NAND_ALE )
+			writeb(0, (volatile __u8 *) this->IO_ADDR_W) + 0x9);
+		else
+			writeb(0, (volatile __u8 *) this->IO_ADDR_W) + 0x8);
+		if ( ctrl & NAND_NCE )
+			writeb(0, (volatile __u8 *) this->IO_ADDR_W) + 0x8);
+		else
+			writeb(0, (volatile __u8 *) this->IO_ADDR_W) + 0xc);
 	}
+
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, this->IO_ADDR_W);
 }
 #else
 #error Unknown IDS852 module revision
@@ -93,11 +85,11 @@ static void nc650_hwcontrol(struct mtd_info *mtd, int cmd)
  * argument are board-specific (per include/linux/mtd/nand.h):
  * - IO_ADDR_R?: address to read the 8 I/O lines of the flash device
  * - IO_ADDR_W?: address to write the 8 I/O lines of the flash device
- * - hwcontrol: hardwarespecific function for accesing control-lines
+ * - cmd_ctrl: hardwarespecific function for accesing control-lines
  * - dev_ready: hardwarespecific function for  accesing device ready/busy line
  * - enable_hwecc?: function to enable (reset)  hardware ecc generator. Must
  *   only be provided if a hardware ECC is available
- * - eccmode: mode of ecc, see defines
+ * - eccm.ode: mode of ecc, see defines
  * - chip_delay: chip dependent delay for transfering data from array to
  *   read regs (tR)
  * - options: various chip options. They can partly be set to inform
@@ -109,8 +101,8 @@ static void nc650_hwcontrol(struct mtd_info *mtd, int cmd)
 int board_nand_init(struct nand_chip *nand)
 {
 
-	nand->hwcontrol = nc650_hwcontrol;
-	nand->eccmode = NAND_ECC_SOFT;
+	nand->cmd_ctrl = nc650_hwcontrol;
+	nand->ecc.mode = NAND_ECC_SOFT;
 	nand->chip_delay = 12;
 /*	nand->options = NAND_SAMSUNG_LP_OPTIONS;*/
 	return 0;

board/netstar/nand.c

@@ -21,6 +21,7 @@
  */
 
 #include <common.h>
+#include <asm/io.h>
 
 #if defined(CONFIG_CMD_NAND)
 
@@ -32,24 +33,29 @@
 #define	MASK_CLE	0x02
 #define	MASK_ALE	0x04
 
-static void netstar_nand_hwcontrol(struct mtd_info *mtd, int cmd)
+static void netstar_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 {
 	struct nand_chip *this = mtd->priv;
 	ulong IO_ADDR_W = (ulong) this->IO_ADDR_W;
 
 	IO_ADDR_W &= ~(MASK_ALE|MASK_CLE);
-	switch (cmd) {
-		case NAND_CTL_SETCLE: IO_ADDR_W |= MASK_CLE; break;
-		case NAND_CTL_SETALE: IO_ADDR_W |= MASK_ALE; break;
+	if (ctrl & NAND_CTRL_CHANGE) {
+		if ( ctrl & NAND_CLE )
+			IO_ADDR_W |= MASK_CLE;
+		if ( ctrl & NAND_ALE )
+			IO_ADDR_W |= MASK_ALE;
 	}
-	this->IO_ADDR_W = (void *) IO_ADDR_W;
+	this->IO_ADDR_W = (void __iomem *) IO_ADDR_W;
+
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, this->IO_ADDR_W);
 }
 
 int board_nand_init(struct nand_chip *nand)
 {
 	nand->options = NAND_SAMSUNG_LP_OPTIONS;
-	nand->eccmode = NAND_ECC_SOFT;
-	nand->hwcontrol = netstar_nand_hwcontrol;
+	nand->ecc.mode = NAND_ECC_SOFT;
+	nand->cmd_ctrl = netstar_nand_hwcontrol;
 	nand->chip_delay = 400;
 	return 0;
 }

board/prodrive/alpr/nand.c

@@ -56,43 +56,24 @@ static struct alpr_ndfc_regs *alpr_ndfc = NULL;
  *
  * There are 2 NAND devices on the board, a Hynix HY27US08561A (1 GByte).
  */
-static void alpr_nand_hwcontrol(struct mtd_info *mtd, int cmd)
+static void alpr_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 {
-	switch (cmd) {
-	case NAND_CTL_SETCLE:
-		hwctl |= 0x1;
-		break;
-	case NAND_CTL_CLRCLE:
-		hwctl &= ~0x1;
-		break;
-	case NAND_CTL_SETALE:
-		hwctl |= 0x2;
-		break;
-	case NAND_CTL_CLRALE:
-		hwctl &= ~0x2;
-		break;
-	case NAND_CTL_SETNCE:
-		break;
-	case NAND_CTL_CLRNCE:
-		writeb(0x00, &(alpr_ndfc->term));
-		break;
-	}
-}
-
-static void alpr_nand_write_byte(struct mtd_info *mtd, u_char byte)
-{
-	struct nand_chip *nand = mtd->priv;
+	struct nand_chip *this = mtd->priv;
 
-	if (hwctl & 0x1)
-		/*
-		 * IO_ADDR_W used as CMD[i] reg to support multiple NAND
-		 * chips.
-		 */
-		writeb(byte, nand->IO_ADDR_W);
-	else if (hwctl & 0x2) {
-		writeb(byte, &(alpr_ndfc->addr_wait));
-	} else
-		writeb(byte, &(alpr_ndfc->data));
+	if (ctrl & NAND_CTRL_CHANGE) {
+		if ( ctrl & NAND_CLE )
+			hwctl |= 0x1;
+		else
+			hwctl &= ~0x1;
+		if ( ctrl & NAND_ALE )
+			hwctl |= 0x2;
+		else
+			hwctl &= ~0x2;
+		if ( (ctrl & NAND_NCE) != NAND_NCE)
+			writeb(0x00, &(alpr_ndfc->term));
+	}
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, this->IO_ADDR_W);
 }
 
 static u_char alpr_nand_read_byte(struct mtd_info *mtd)
@@ -158,12 +139,10 @@ int board_nand_init(struct nand_chip *nand)
 {
 	alpr_ndfc = (struct alpr_ndfc_regs *)CFG_NAND_BASE;
 
-	nand->eccmode = NAND_ECC_SOFT;
+	nand->ecc.mode = NAND_ECC_SOFT;
 
 	/* Reference hardware control function */
-	nand->hwcontrol  = alpr_nand_hwcontrol;
-	/* Set command delay time */
-	nand->write_byte = alpr_nand_write_byte;
+	nand->cmd_ctrl  = alpr_nand_hwcontrol;
 	nand->read_byte  = alpr_nand_read_byte;
 	nand->write_buf  = alpr_nand_write_buf;
 	nand->read_buf   = alpr_nand_read_buf;

board/prodrive/pdnb3/nand.c

@@ -52,40 +52,26 @@ static struct pdnb3_ndfc_regs *pdnb3_ndfc;
  *
  * There is one NAND devices on the board, a Hynix HY27US08561A (32 MByte).
  */
-static void pdnb3_nand_hwcontrol(struct mtd_info *mtd, int cmd)
+static void pdnb3_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 {
-	switch (cmd) {
-	case NAND_CTL_SETCLE:
-		hwctl |= 0x1;
-		break;
-	case NAND_CTL_CLRCLE:
-		hwctl &= ~0x1;
-		break;
-
-	case NAND_CTL_SETALE:
-		hwctl |= 0x2;
-		break;
-	case NAND_CTL_CLRALE:
-		hwctl &= ~0x2;
-		break;
-
-	case NAND_CTL_SETNCE:
-		break;
-	case NAND_CTL_CLRNCE:
-		writeb(0x00, &(pdnb3_ndfc->term));
-		break;
+	struct nand_chip *this = mtd->priv;
+
+	if (ctrl & NAND_CTRL_CHANGE) {
+		if ( ctrl & NAND_CLE )
+			hwctl |= 0x1;
+		else
+			hwctl &= ~0x1;
+		if ( ctrl & NAND_ALE )
+			hwctl |= 0x2;
+		else
+			hwctl &= ~0x2;
+		if ( (ctrl & NAND_NCE) != NAND_NCE)
+			writeb(0x00, &(pdnb3_ndfc->term));
 	}
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, this->IO_ADDR_W);
 }
 
-static void pdnb3_nand_write_byte(struct mtd_info *mtd, u_char byte)
-{
-	if (hwctl & 0x1)
-		writeb(byte, &(pdnb3_ndfc->cmd));
-	else if (hwctl & 0x2)
-		writeb(byte, &(pdnb3_ndfc->addr));
-	else
-		writeb(byte, &(pdnb3_ndfc->data));
-}
 
 static u_char pdnb3_nand_read_byte(struct mtd_info *mtd)
 {
@@ -152,16 +138,13 @@ int board_nand_init(struct nand_chip *nand)
 {
 	pdnb3_ndfc = (struct pdnb3_ndfc_regs *)CFG_NAND_BASE;
 
-	nand->eccmode = NAND_ECC_SOFT;
+	nand->ecc.mode = NAND_ECC_SOFT;
 
 	/* Set address of NAND IO lines (Using Linear Data Access Region) */
 	nand->IO_ADDR_R = (void __iomem *) ((ulong) pdnb3_ndfc + 0x4);
 	nand->IO_ADDR_W = (void __iomem *) ((ulong) pdnb3_ndfc + 0x4);
 	/* Reference hardware control function */
-	nand->hwcontrol  = pdnb3_nand_hwcontrol;
-	/* Set command delay time */
-	nand->hwcontrol  = pdnb3_nand_hwcontrol;
-	nand->write_byte = pdnb3_nand_write_byte;
+	nand->cmd_ctrl   = pdnb3_nand_hwcontrol;
 	nand->read_byte  = pdnb3_nand_read_byte;
 	nand->write_buf  = pdnb3_nand_write_buf;
 	nand->read_buf   = pdnb3_nand_read_buf;

board/sc3/sc3nand.c

@@ -39,30 +39,26 @@
 static void *sc3_io_base;
 static void *sc3_control_base = (void *)0xEF600700;
 
-static void sc3_nand_hwcontrol(struct mtd_info *mtd, int cmd)
+static void sc3_nand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 {
-	switch (cmd) {
-	case NAND_CTL_SETCLE:
-		set_bit (SC3_NAND_CLE, sc3_control_base);
-		break;
-	case NAND_CTL_CLRCLE:
-		clear_bit (SC3_NAND_CLE, sc3_control_base);
-		break;
-
-	case NAND_CTL_SETALE:
-		set_bit (SC3_NAND_ALE, sc3_control_base);
-		break;
-	case NAND_CTL_CLRALE:
-		clear_bit (SC3_NAND_ALE, sc3_control_base);
-		break;
-
-	case NAND_CTL_SETNCE:
-		set_bit (SC3_NAND_CE, sc3_control_base);
-		break;
-	case NAND_CTL_CLRNCE:
-		clear_bit (SC3_NAND_CE, sc3_control_base);
-		break;
+	struct nand_chip *this = mtd->priv;
+	if (ctrl & NAND_CTRL_CHANGE) {
+		if ( ctrl & NAND_CLE )
+			set_bit (SC3_NAND_CLE, sc3_control_base);
+		else
+			clear_bit (SC3_NAND_CLE, sc3_control_base);
+		if ( ctrl & NAND_ALE )
+			set_bit (SC3_NAND_ALE, sc3_control_base);
+		else
+			clear_bit (SC3_NAND_ALE, sc3_control_base);
+		if ( ctrl & NAND_NCE )
+			set_bit (SC3_NAND_CE, sc3_control_base);
+		else
+			clear_bit (SC3_NAND_CE, sc3_control_base);
 	}
+
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, this->IO_ADDR_W);
 }
 
 static int sc3_nand_dev_ready(struct mtd_info *mtd)
@@ -79,14 +75,14 @@ static void sc3_select_chip(struct mtd_info *mtd, int chip)
 
 int board_nand_init(struct nand_chip *nand)
 {
-	nand->eccmode = NAND_ECC_SOFT;
+	nand->ecc.mode = NAND_ECC_SOFT;
 
 	sc3_io_base = (void *) CFG_NAND_BASE;
 	/* Set address of NAND IO lines (Using Linear Data Access Region) */
 	nand->IO_ADDR_R = (void __iomem *) sc3_io_base;
 	nand->IO_ADDR_W = (void __iomem *) sc3_io_base;
 	/* Reference hardware control function */
-	nand->hwcontrol  = sc3_nand_hwcontrol;
+	nand->cmd_ctrl  = sc3_nand_hwcontrol;
 	nand->dev_ready  = sc3_nand_dev_ready;
 	nand->select_chip = sc3_select_chip;
 	return 0;

board/tqc/tqm8272/tqm8272.c

@@ -1068,24 +1068,22 @@ int update_flash_size (int flash_size)
 
 static u8 hwctl = 0;
 
-static void upmnand_hwcontrol(struct mtd_info *mtdinfo, int cmd)
+static void upmnand_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 {
-	switch (cmd) {
-	case NAND_CTL_SETCLE:
-		hwctl |= 0x1;
-		break;
-	case NAND_CTL_CLRCLE:
-		hwctl &= ~0x1;
-		break;
-
-	case NAND_CTL_SETALE:
-		hwctl |= 0x2;
-		break;
-
-	case NAND_CTL_CLRALE:
-		hwctl &= ~0x2;
-		break;
+	struct nand_chip *this = mtd->priv;
+
+	if (ctrl & NAND_CTRL_CHANGE) {
+		if ( ctrl & NAND_CLE )
+			hwctl |= 0x1;
+		else
+			hwctl &= ~0x1;
+		if ( ctrl & NAND_ALE )
+			hwctl |= 0x2;
+		else
+			hwctl &= ~0x2;
 	}
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, this->IO_ADDR_W);
 }
 
 static void upmnand_write_byte(struct mtd_info *mtdinfo, u_char byte)
@@ -1188,9 +1186,9 @@ int board_nand_init(struct nand_chip *nand)
 	memctl->memc_br3 = CFG_NAND_BR;
 	memctl->memc_mbmr = (MxMR_OP_NORM);
 
-	nand->eccmode = NAND_ECC_SOFT;
+	nand->ecc.mode = NAND_ECC_SOFT;
 
-	nand->hwcontrol	 = upmnand_hwcontrol;
+	nand->cmd_ctrl	 = upmnand_hwcontrol;
 	nand->read_byte	 = upmnand_read_byte;
 	nand->write_byte = upmnand_write_byte;
 	nand->dev_ready	 = tqm8272_dev_ready;

board/zylonite/nand.c

@@ -69,7 +69,7 @@ static struct nand_oobinfo delta_oob = {
 /*
  * not required for Monahans DFC
  */
-static void dfc_hwcontrol(struct mtd_info *mtdinfo, int cmd)
+static void dfc_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 {
 	return;
 }
@@ -110,25 +110,6 @@ static void dfc_write_buf(struct mtd_info *mtd, const u_char *buf, int len)
 }
 
 
-/*
- * These functions are quite problematic for the DFC. Luckily they are
- * not used in the current nand code, except for nand_command, which
- * we've defined our own anyway. The problem is, that we always need
- * to write 4 bytes to the DFC Data Buffer, but in these functions we
- * don't know if to buffer the bytes/half words until we've gathered 4
- * bytes or if to send them straight away.
- *
- * Solution: Don't use these with Mona's DFC and complain loudly.
- */
-static void dfc_write_word(struct mtd_info *mtd, u16 word)
-{
-	printf("dfc_write_word: WARNING, this function does not work with the Monahans DFC!\n");
-}
-static void dfc_write_byte(struct mtd_info *mtd, u_char byte)
-{
-	printf("dfc_write_byte: WARNING, this function does not work with the Monahans DFC!\n");
-}
-
 /* The original:
  * static void dfc_read_buf(struct mtd_info *mtd, const u_char *buf, int len)
  *
@@ -168,7 +149,7 @@ static void dfc_read_buf(struct mtd_info *mtd, u_char* const buf, int len)
  */
 static u16 dfc_read_word(struct mtd_info *mtd)
 {
-	printf("dfc_write_byte: UNIMPLEMENTED.\n");
+	printf("dfc_read_word: UNIMPLEMENTED.\n");
 	return 0;
 }
 
@@ -289,9 +270,10 @@ static void dfc_new_cmd(void)
 
 /* this function is called after Programm and Erase Operations to
  * check for success or failure */
-static int dfc_wait(struct mtd_info *mtd, struct nand_chip *this, int state)
+static int dfc_wait(struct mtd_info *mtd, struct nand_chip *this)
 {
 	unsigned long ndsr=0, event=0;
+	int state = this->state;
 
 	if(state == FL_WRITING) {
 		event = NDSR_CS0_CMDD | NDSR_CS0_BBD;
@@ -435,11 +417,11 @@ static void dfc_gpio_init(void)
  * argument are board-specific (per include/linux/mtd/nand_new.h):
  * - IO_ADDR_R?: address to read the 8 I/O lines of the flash device
  * - IO_ADDR_W?: address to write the 8 I/O lines of the flash device
- * - hwcontrol: hardwarespecific function for accesing control-lines
+ * - cmd_ctrl: hardwarespecific function for accesing control-lines
  * - dev_ready: hardwarespecific function for  accesing device ready/busy line
  * - enable_hwecc?: function to enable (reset)  hardware ecc generator. Must
  *   only be provided if a hardware ECC is available
- * - eccmode: mode of ecc, see defines
+ * - ecc.mode: mode of ecc, see defines
  * - chip_delay: chip dependent delay for transfering data from array to
  *   read regs (tR)
  * - options: various chip options. They can partly be set to inform
@@ -560,21 +542,18 @@ int board_nand_init(struct nand_chip *nand)
 	/* wait 10 us due to cmd buffer clear reset */
 	/*	wait(10); */
 
-
-	nand->hwcontrol = dfc_hwcontrol;
+	nand->cmd_ctrl = dfc_hwcontrol;
 /*	nand->dev_ready = dfc_device_ready; */
-	nand->eccmode = NAND_ECC_SOFT;
+	nand->ecc.mode = NAND_ECC_SOFT;
 	nand->options = NAND_BUSWIDTH_16;
 	nand->waitfunc = dfc_wait;
 	nand->read_byte = dfc_read_byte;
-	nand->write_byte = dfc_write_byte;
 	nand->read_word = dfc_read_word;
-	nand->write_word = dfc_write_word;
 	nand->read_buf = dfc_read_buf;
 	nand->write_buf = dfc_write_buf;
 
 	nand->cmdfunc = dfc_cmdfunc;
-	nand->autooob = &delta_oob;
+/*	nand->autooob = &delta_oob; */
 	nand->badblock_pattern = &delta_bbt_descr;
 	return 0;
 }

common/Makefile

@@ -98,6 +98,7 @@ COBJS-$(CONFIG_CMD_TERMINAL) += cmd_terminal.o
 COBJS-$(CONFIG_CMD_UNIVERSE) += cmd_universe.o
 COBJS-$(CONFIG_CMD_USB) += cmd_usb.o
 COBJS-$(CONFIG_CMD_XIMG) += cmd_ximg.o
+COBJS-$(CONFIG_YAFFS2) += cmd_yaffs2.o
 COBJS-y += cmd_vfd.o
 COBJS-y += command.o
 COBJS-y += console.o

common/cmd_doc.c

@@ -14,6 +14,12 @@
 #include <linux/mtd/nftl.h>
 #include <linux/mtd/doc2000.h>
 
+/*
+ * ! BROKEN !
+ *
+ * TODO: must be implemented and tested by someone with HW
+ */
+#if 0
 #ifdef CFG_DOC_SUPPORT_2000
 #define DoC_is_2000(doc) (doc->ChipID == DOC_ChipID_Doc2k)
 #else
@@ -1629,3 +1635,6 @@ void doc_probe(unsigned long physadr)
 		puts ("No DiskOnChip found\n");
 	}
 }
+#else
+void doc_probe(unsigned long physadr) {}
+#endif

common/cmd_nand.c

@@ -18,6 +18,7 @@
  *
  */
 #include <common.h>
+#include <linux/mtd/mtd.h>
 
 #if defined(CONFIG_CMD_NAND)
 
@@ -34,48 +35,58 @@
 int mtdparts_init(void);
 int id_parse(const char *id, const char **ret_id, u8 *dev_type, u8 *dev_num);
 int find_dev_and_part(const char *id, struct mtd_device **dev,
-		u8 *part_num, struct part_info **part);
+                      u8 *part_num, struct part_info **part);
 #endif
 
-static int nand_dump_oob(nand_info_t *nand, ulong off)
-{
-	return 0;
-}
-
-static int nand_dump(nand_info_t *nand, ulong off)
+static int nand_dump(nand_info_t *nand, ulong off, int only_oob)
 {
 	int i;
-	u_char *buf, *p;
+	u_char *datbuf, *oobbuf, *p;
 
-	buf = malloc(nand->oobblock + nand->oobsize);
-	if (!buf) {
+	datbuf = malloc(nand->writesize + nand->oobsize);
+	oobbuf = malloc(nand->oobsize);
+	if (!datbuf || !oobbuf) {
 		puts("No memory for page buffer\n");
 		return 1;
 	}
-	off &= ~(nand->oobblock - 1);
-	i = nand_read_raw(nand, buf, off, nand->oobblock, nand->oobsize);
+	off &= ~(nand->writesize - 1);
+	loff_t addr = (loff_t) off;
+	struct mtd_oob_ops ops;
+	memset(&ops, 0, sizeof(ops));
+	ops.datbuf = datbuf;
+	ops.oobbuf = oobbuf; /* must exist, but oob data will be appended to ops.datbuf */
+	ops.len = nand->writesize;
+	ops.ooblen = nand->oobsize;
+	ops.mode = MTD_OOB_RAW;
+	i = nand->read_oob(nand, addr, &ops);
 	if (i < 0) {
 		printf("Error (%d) reading page %08lx\n", i, off);
-		free(buf);
+		free(datbuf);
+		free(oobbuf);
 		return 1;
 	}
 	printf("Page %08lx dump:\n", off);
-	i = nand->oobblock >> 4; p = buf;
+	i = nand->writesize >> 4;
+	p = datbuf;
+		
 	while (i--) {
-		printf( "\t%02x %02x %02x %02x %02x %02x %02x %02x"
-			"  %02x %02x %02x %02x %02x %02x %02x %02x\n",
-			p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7],
-			p[8], p[9], p[10], p[11], p[12], p[13], p[14], p[15]);
+		if (!only_oob)
+			printf("\t%02x %02x %02x %02x %02x %02x %02x %02x"
+			       "  %02x %02x %02x %02x %02x %02x %02x %02x\n",
+			       p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7],
+			       p[8], p[9], p[10], p[11], p[12], p[13], p[14],
+			       p[15]);
 		p += 16;
 	}
 	puts("OOB:\n");
 	i = nand->oobsize >> 3;
 	while (i--) {
-		printf( "\t%02x %02x %02x %02x %02x %02x %02x %02x\n",
-			p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
+		printf("\t%02x %02x %02x %02x %02x %02x %02x %02x\n",
+		       p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
 		p += 8;
 	}
-	free(buf);
+	free(datbuf);
+	free(oobbuf);
 
 	return 0;
 }
@@ -155,7 +166,7 @@ out:
 
 int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 {
-	int i, dev, ret;
+	int i, dev, ret = 0;
 	ulong addr, off;
 	size_t size;
 	char *cmd, *s;
@@ -182,8 +193,8 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 		for (i = 0; i < CFG_MAX_NAND_DEVICE; i++) {
 			if (nand_info[i].name)
 				printf("Device %d: %s, sector size %u KiB\n",
-					i, nand_info[i].name,
-					nand_info[i].erasesize >> 10);
+ 				       i, nand_info[i].name,
+				       nand_info[i].erasesize >> 10);
 		}
 		return 0;
 	}
@@ -196,7 +207,7 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 				puts("\nno devices available\n");
 			else
 				printf("\nDevice %d: %s\n", nand_curr_device,
-					nand_info[nand_curr_device].name);
+				       nand_info[nand_curr_device].name);
 			return 0;
 		}
 		dev = (int)simple_strtoul(argv[2], NULL, 10);
@@ -299,15 +310,14 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 		off = (int)simple_strtoul(argv[2], NULL, 16);
 
 		if (s != NULL && strcmp(s, ".oob") == 0)
-			ret = nand_dump_oob(nand, off);
+			ret = nand_dump(nand, off, 1);
 		else
-			ret = nand_dump(nand, off);
+			ret = nand_dump(nand, off, 0);
 
 		return ret == 0 ? 1 : 0;
 
 	}
 
-	/* read write */
 	if (strncmp(cmd, "read", 4) == 0 || strncmp(cmd, "write", 5) == 0) {
 		int read;
 
@@ -322,43 +332,29 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 			return 1;
 
 		s = strchr(cmd, '.');
-		if (s != NULL &&
-		    (!strcmp(s, ".jffs2") || !strcmp(s, ".e") || !strcmp(s, ".i"))) {
-			if (read) {
-				/* read */
-				nand_read_options_t opts;
-				memset(&opts, 0, sizeof(opts));
-				opts.buffer	= (u_char*) addr;
-				opts.length	= size;
-				opts.offset	= off;
-				opts.quiet      = quiet;
-				ret = nand_read_opts(nand, &opts);
-			} else {
-				/* write */
-				nand_write_options_t opts;
-				memset(&opts, 0, sizeof(opts));
-				opts.buffer	= (u_char*) addr;
-				opts.length	= size;
-				opts.offset	= off;
-				/* opts.forcejffs2 = 1; */
-				opts.pad	= 1;
-				opts.blockalign = 1;
-				opts.quiet      = quiet;
-				ret = nand_write_opts(nand, &opts);
-			}
-		} else if (s != NULL && !strcmp(s, ".oob")) {
-			/* read out-of-band data */
+		if (!s || !strcmp(s, ".jffs2") ||
+		    !strcmp(s, ".e") || !strcmp(s, ".i")) {
 			if (read)
-				ret = nand->read_oob(nand, off, size, &size,
-						     (u_char *) addr);
+				ret = nand_read_skip_bad(nand, off, &size,
+				                         (u_char *)addr);
 			else
-				ret = nand->write_oob(nand, off, size, &size,
-						      (u_char *) addr);
-		} else {
+				ret = nand_write_skip_bad(nand, off, &size,
+				                          (u_char *)addr);
+		} else if (s != NULL && !strcmp(s, ".oob")) {
+			/* out-of-band data */
+			mtd_oob_ops_t ops = {
+				.oobbuf = (u8 *)addr,
+				.ooblen = size,
+				.mode = MTD_OOB_RAW
+			};
+
 			if (read)
-				ret = nand_read(nand, off, &size, (u_char *)addr);
+				ret = nand->read_oob(nand, off, &ops);
 			else
-				ret = nand_write(nand, off, &size, (u_char *)addr);
+				ret = nand->write_oob(nand, off, &ops);
+		} else {
+			printf("Unknown nand command suffix '%s'.\n", s);
+			return 1;
 		}
 
 		printf(" %d bytes %s: %s\n", size,
@@ -381,6 +377,7 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 		}
 		return 1;
 	}
+
 	if (strcmp(cmd, "biterr") == 0) {
 		/* todo */
 		return 1;
@@ -395,7 +392,12 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 			if (!strcmp("status", argv[2]))
 				status = 1;
 		}
-
+/*
+ * ! BROKEN !
+ *
+ * TODO: must be implemented and tested by someone with HW
+ */
+#if 0
 		if (status) {
 			ulong block_start = 0;
 			ulong off;
@@ -406,28 +408,28 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 			nand_chip->cmdfunc (nand, NAND_CMD_STATUS, -1, -1);
 			printf("device is %swrite protected\n",
 			       (nand_chip->read_byte(nand) & 0x80 ?
-				"NOT " : "" ) );
+			       "NOT " : ""));
 
-			for (off = 0; off < nand->size; off += nand->oobblock) {
+			for (off = 0; off < nand->size; off += nand->writesize) {
 				int s = nand_get_lock_status(nand, off);
 
 				/* print message only if status has changed
 				 * or at end of chip
 				 */
-				if (off == nand->size - nand->oobblock
+				if (off == nand->size - nand->writesize
 				    || (s != last_status && off != 0))	{
 
-					printf("%08lx - %08lx: %8lu pages %s%s%s\n",
+					printf("%08lx - %08lx: %8d pages %s%s%s\n",
 					       block_start,
 					       off-1,
-					       (off-block_start)/nand->oobblock,
+					       (off-block_start)/nand->writesize,
 					       ((last_status & NAND_LOCK_STATUS_TIGHT) ? "TIGHT " : ""),
 					       ((last_status & NAND_LOCK_STATUS_LOCK) ? "LOCK " : ""),
 					       ((last_status & NAND_LOCK_STATUS_UNLOCK) ? "UNLOCK " : ""));
 				}
 
 				last_status = s;
-		       }
+			}
 		} else {
 			if (!nand_lock(nand, tight)) {
 				puts("NAND flash successfully locked\n");
@@ -436,6 +438,7 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 				return 1;
 			}
 		}
+#endif
 		return 0;
 	}
 
@@ -443,6 +446,12 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 		if (arg_off_size(argc - 2, argv + 2, nand, &off, &size) < 0)
 			return 1;
 
+/*
+ * ! BROKEN !
+ *
+ * TODO: must be implemented and tested by someone with HW
+ */
+#if 0
 		if (!nand_unlock(nand, off, size)) {
 			puts("NAND flash successfully unlocked\n");
 		} else {
@@ -450,6 +459,7 @@ int do_nand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 			     "write and erase will probably fail\n");
 			return 1;
 		}
+#endif
 		return 0;
 	}
 
@@ -459,54 +469,47 @@ usage:
 }
 
 U_BOOT_CMD(nand, 5, 1, do_nand,
-	"nand    - NAND sub-system\n",
-	"info                  - show available NAND devices\n"
-	"nand device [dev]     - show or set current device\n"
-	"nand read[.jffs2]     - addr off|partition size\n"
-	"nand write[.jffs2]    - addr off|partition size - read/write `size' bytes starting\n"
-	"    at offset `off' to/from memory address `addr'\n"
-	"nand erase [clean] [off size] - erase `size' bytes from\n"
-	"    offset `off' (entire device if not specified)\n"
-	"nand bad - show bad blocks\n"
-	"nand dump[.oob] off - dump page\n"
-	"nand scrub - really clean NAND erasing bad blocks (UNSAFE)\n"
-	"nand markbad off - mark bad block at offset (UNSAFE)\n"
-	"nand biterr off - make a bit error at offset (UNSAFE)\n"
-	"nand lock [tight] [status] - bring nand to lock state or display locked pages\n"
-	"nand unlock [offset] [size] - unlock section\n");
+           "nand - NAND sub-system\n",
+           "info - show available NAND devices\n"
+           "nand device [dev] - show or set current device\n"
+           "nand read - addr off|partition size\n"
+           "nand write - addr off|partition size\n"
+           "    read/write 'size' bytes starting at offset 'off'\n"
+           "    to/from memory address 'addr', skipping bad blocks.\n"
+           "nand erase [clean] [off size] - erase 'size' bytes from\n"
+           "    offset 'off' (entire device if not specified)\n"
+           "nand bad - show bad blocks\n"
+           "nand dump[.oob] off - dump page\n"
+           "nand scrub - really clean NAND erasing bad blocks (UNSAFE)\n"
+           "nand markbad off - mark bad block at offset (UNSAFE)\n"
+           "nand biterr off - make a bit error at offset (UNSAFE)\n"
+           "nand lock [tight] [status]\n"
+           "    bring nand to lock state or display locked pages\n"
+           "nand unlock [offset] [size] - unlock section\n");
 
 static int nand_load_image(cmd_tbl_t *cmdtp, nand_info_t *nand,
-			   ulong offset, ulong addr, char *cmd)
+                           ulong offset, ulong addr, char *cmd)
 {
 	int r;
 	char *ep, *s;
 	size_t cnt;
 	image_header_t *hdr;
-	int jffs2 = 0;
 #if defined(CONFIG_FIT)
 	const void *fit_hdr = NULL;
 #endif
 
 	s = strchr(cmd, '.');
 	if (s != NULL &&
-	    (!strcmp(s, ".jffs2") || !strcmp(s, ".e") || !strcmp(s, ".i")))
-		jffs2 = 1;
+	    (strcmp(s, ".jffs2") && !strcmp(s, ".e") && !strcmp(s, ".i"))) {
+		printf("Unknown nand load suffix '%s'\n", s);
+		show_boot_progress(-53);
+		return 1;
+	}
 
 	printf("\nLoading from %s, offset 0x%lx\n", nand->name, offset);
 
-	cnt = nand->oobblock;
-	if (jffs2) {
-		nand_read_options_t opts;
-		memset(&opts, 0, sizeof(opts));
-		opts.buffer	= (u_char*) addr;
-		opts.length	= cnt;
-		opts.offset	= offset;
-		opts.quiet      = 1;
-		r = nand_read_opts(nand, &opts);
-	} else {
-		r = nand_read(nand, offset, &cnt, (u_char *) addr);
-	}
-
+	cnt = nand->writesize;
+	r = nand_read(nand, offset, &cnt, (u_char *) addr);
 	if (r) {
 		puts("** Read error\n");
 		show_boot_progress (-56);
@@ -536,19 +539,10 @@ static int nand_load_image(cmd_tbl_t *cmdtp, nand_info_t *nand,
 		puts ("** Unknown image type\n");
 		return 1;
 	}
+	show_boot_progress (57);
 
-	if (jffs2) {
-		nand_read_options_t opts;
-		memset(&opts, 0, sizeof(opts));
-		opts.buffer	= (u_char*) addr;
-		opts.length	= cnt;
-		opts.offset	= offset;
-		opts.quiet      = 1;
-		r = nand_read_opts(nand, &opts);
-	} else {
-		r = nand_read(nand, offset, &cnt, (u_char *) addr);
-	}
-
+	/* FIXME: skip bad blocks */
+	r = nand_read(nand, offset, &cnt, (u_char *) addr);
 	if (r) {
 		puts("** Read error\n");
 		show_boot_progress (-58);
@@ -614,7 +608,7 @@ int do_nandboot(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 			else
 				addr = CFG_LOAD_ADDR;
 			return nand_load_image(cmdtp, &nand_info[dev->id->num],
-					       part->offset, addr, argv[0]);
+			                       part->offset, addr, argv[0]);
 		}
 	}
 #endif
@@ -669,7 +663,7 @@ usage:
 
 U_BOOT_CMD(nboot, 4, 1, do_nandboot,
 	"nboot   - boot from NAND device\n",
-	"[.jffs2] [partition] | [[[loadAddr] dev] offset]\n");
+	"[partition] | [[[loadAddr] dev] offset]\n");
 
 #endif
 
@@ -726,10 +720,10 @@ void archflashwp(void *archdata, int wp);
 #define CONFIG_MTD_NAND_ECC_JFFS2
 
 /* bits for nand_legacy_rw() `cmd'; or together as needed */
-#define NANDRW_READ	0x01
-#define NANDRW_WRITE	0x00
-#define NANDRW_JFFS2	0x02
-#define NANDRW_JFFS2_SKIP	0x04
+#define NANDRW_READ         0x01
+#define NANDRW_WRITE        0x00
+#define NANDRW_JFFS2	    0x02
+#define NANDRW_JFFS2_SKIP   0x04
 
 /*
  * Imports from nand_legacy.c
@@ -839,11 +833,11 @@ int do_nand (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 
 		if (strncmp (argv[1], "read", 4) == 0 ||
 		    strncmp (argv[1], "write", 5) == 0) {
-			ulong	addr = simple_strtoul (argv[2], NULL, 16);
-			off_t	off  = simple_strtoul (argv[3], NULL, 16);
-			size_t	size = simple_strtoul (argv[4], NULL, 16);
-			int	cmd = (strncmp (argv[1], "read", 4) == 0) ?
-					NANDRW_READ : NANDRW_WRITE;
+			ulong addr = simple_strtoul (argv[2], NULL, 16);
+			off_t off = simple_strtoul (argv[3], NULL, 16);
+			size_t size = simple_strtoul (argv[4], NULL, 16);
+			int cmd = (strncmp (argv[1], "read", 4) == 0) ?
+			          NANDRW_READ : NANDRW_WRITE;
 			size_t total;
 			int ret;
 			char *cmdtail = strchr (argv[1], '.');
@@ -892,8 +886,7 @@ int do_nand (cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 
 			ret = nand_legacy_rw (nand_dev_desc + curr_device,
 					      cmd, off, size,
-					      &total,
-					      (u_char *) addr);
+					      &total, (u_char *) addr);
 
 			printf (" %d bytes %s: %s\n", total,
 				(cmd & NANDRW_READ) ? "read" : "written",
@@ -1000,11 +993,11 @@ int do_nandboot (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	show_boot_progress (55);
 
 	printf ("\nLoading from device %d: %s at 0x%lx (offset 0x%lx)\n",
-		dev, nand_dev_desc[dev].name, nand_dev_desc[dev].IO_ADDR,
-		offset);
+	    dev, nand_dev_desc[dev].name, nand_dev_desc[dev].IO_ADDR,
+	    offset);
 
 	if (nand_legacy_rw (nand_dev_desc + dev, NANDRW_READ, offset,
-			SECTORSIZE, NULL, (u_char *)addr)) {
+	                    SECTORSIZE, NULL, (u_char *)addr)) {
 		printf ("** Read error on %d\n", dev);
 		show_boot_progress (-56);
 		return 1;
@@ -1035,8 +1028,8 @@ int do_nandboot (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
 	show_boot_progress (57);
 
 	if (nand_legacy_rw (nand_dev_desc + dev, NANDRW_READ,
-			offset + SECTORSIZE, cnt, NULL,
-			(u_char *)(addr+SECTORSIZE))) {
+	                    offset + SECTORSIZE, cnt, NULL,
+	                    (u_char *)(addr+SECTORSIZE))) {
 		printf ("** Read error on %d\n", dev);
 		show_boot_progress (-58);
 		return 1;

common/cmd_onenand.c

@@ -38,7 +38,7 @@ int do_onenand(cmd_tbl_t * cmdtp, int flag, int argc, char *argv[])
 			onenand_init();
 			return 0;
 		}
-		onenand_print_device_info(onenand_chip.device_id, 1);
+		printf("%s\n", onenand_mtd.name);
 		return 0;
 
 	default:

common/cmd_yaffs2.c

@@ -0,0 +1,215 @@
+#include <common.h>
+
+#include <config.h>
+#include <command.h>
+
+#ifdef  YAFFS2_DEBUG
+#define PRINTF(fmt,args...) printf (fmt ,##args)
+#else
+#define PRINTF(fmt,args...)
+#endif
+
+extern void cmd_yaffs_mount(char *mp);
+extern void cmd_yaffs_umount(char *mp);
+extern void cmd_yaffs_read_file(char *fn);
+extern void cmd_yaffs_write_file(char *fn,char bval,int sizeOfFile);
+extern void cmd_yaffs_ls(const char *mountpt, int longlist);
+extern void cmd_yaffs_mwrite_file(char *fn, char *addr, int size);
+extern void cmd_yaffs_mread_file(char *fn, char *addr);
+extern void cmd_yaffs_mkdir(const char *dir);
+extern void cmd_yaffs_rmdir(const char *dir);
+extern void cmd_yaffs_rm(const char *path);
+extern void cmd_yaffs_mv(const char *oldPath, const char *newPath);
+
+extern int yaffs_DumpDevStruct(const char *path);
+
+
+int do_ymount (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+    char *mtpoint = argv[1];
+    cmd_yaffs_mount(mtpoint);
+    
+    return(0);
+}
+
+int do_yumount (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+    char *mtpoint = argv[1];
+    cmd_yaffs_umount(mtpoint);
+    
+    return(0);
+}
+
+int do_yls (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+    char *dirname = argv[argc-1];
+    
+    cmd_yaffs_ls(dirname, (argc>2)?1:0);
+
+    return(0);
+}
+
+int do_yrd (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+    char *filename = argv[1];
+    printf ("Reading file %s ", filename);
+
+    cmd_yaffs_read_file(filename);
+
+    printf ("done\n");
+    return(0);
+}
+
+int do_ywr (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+    char *filename = argv[1];
+    ulong value = simple_strtoul(argv[2], NULL, 16);
+    ulong numValues = simple_strtoul(argv[3], NULL, 16);
+
+    printf ("Writing value (%x) %x times to %s... ", value, numValues, filename);
+
+    cmd_yaffs_write_file(filename,value,numValues);
+
+    printf ("done\n");
+    return(0);
+}
+
+int do_yrdm (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+    char *filename = argv[1];
+    ulong addr = simple_strtoul(argv[2], NULL, 16);
+
+    cmd_yaffs_mread_file(filename, (char *)addr);
+
+    return(0);
+}
+
+int do_ywrm (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+    char *filename = argv[1];
+    ulong addr = simple_strtoul(argv[2], NULL, 16);
+    ulong size = simple_strtoul(argv[3], NULL, 16);
+
+    cmd_yaffs_mwrite_file(filename, (char *)addr, size);
+
+    return(0);
+}
+
+int do_ymkdir (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+    char *dirname = argv[1];
+
+    cmd_yaffs_mkdir(dirname);
+
+    return(0);
+}
+
+int do_yrmdir (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+    char *dirname = argv[1];
+
+    cmd_yaffs_rmdir(dirname);
+
+    return(0);
+}
+
+int do_yrm (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+    char *path = argv[1];
+
+    cmd_yaffs_rm(path);
+
+    return(0);
+}
+
+int do_ymv (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+    char *oldPath = argv[1];
+    char *newPath = argv[2];
+
+    cmd_yaffs_mv(newPath, oldPath);
+
+    return(0);
+}
+
+int do_ydump (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
+{
+    char *dirname = argv[1];
+    if (yaffs_DumpDevStruct(dirname) != 0)
+        printf("yaffs_DumpDevStruct returning error when dumping path: , %s\n", dirname);
+    return 0;
+}
+
+
+
+U_BOOT_CMD(
+    ymount, 3,  0,  do_ymount,
+    "ymount\t- mount yaffs\n",
+    "\n"
+);
+
+U_BOOT_CMD(
+    yumount, 3,  0,  do_yumount,
+    "yumount\t- unmount yaffs\n",
+    "\n"
+);
+
+U_BOOT_CMD(
+    yls,    4,  0,  do_yls,
+    "yls\t- yaffs ls\n",
+    "[-l] name\n"
+);
+
+U_BOOT_CMD(
+    yrd,    2,  0,  do_yrd,
+    "yrd\t- read file from yaffs\n",
+    "filename\n"
+);
+
+U_BOOT_CMD(
+    ywr,    4,  0,  do_ywr,
+    "ywr\t- write file to yaffs\n",
+    "filename value num_vlues\n"
+);
+
+U_BOOT_CMD(
+    yrdm,   3,  0,  do_yrdm,
+    "yrdm\t- read file to memory from yaffs\n",
+    "filename offset\n"
+);
+
+U_BOOT_CMD(
+    ywrm,   4,  0,  do_ywrm,
+    "ywrm\t- write file from memory to yaffs\n",
+    "filename offset size\n"
+);
+
+U_BOOT_CMD(
+    ymkdir, 2,  0,  do_ymkdir,
+    "ymkdir\t- YAFFS mkdir\n",
+    "dirname\n"
+);
+
+U_BOOT_CMD(
+    yrmdir, 2,  0,  do_yrmdir,
+    "yrmdir\t- YAFFS rmdir\n",
+    "dirname\n"
+);
+
+U_BOOT_CMD(
+    yrm,    2,  0,  do_yrm,
+    "yrm\t- YAFFS rm\n",
+    "path\n"
+);
+
+U_BOOT_CMD(
+    ymv,    4,  0,  do_ymv,
+    "ymv\t- YAFFS mv\n",
+    "oldPath newPath\n"
+);
+
+U_BOOT_CMD(
+    ydump,  2,  0,  do_ydump,
+    "ydump\t- YAFFS device struct\n",
+    "dirname\n"
+);

common/env_nand.c

@@ -159,22 +159,23 @@ int writeenv(size_t offset, u_char *buf)
 {
 	size_t end = offset + CFG_ENV_RANGE;
 	size_t amount_saved = 0;
-	size_t blocksize;
+	size_t blocksize, len;
 
 	u_char *char_ptr;
 
 	blocksize = nand_info[0].erasesize;
+	len = min(blocksize, CFG_ENV_SIZE);
 
 	while (amount_saved < CFG_ENV_SIZE && offset < end) {
 		if (nand_block_isbad(&nand_info[0], offset)) {
 			offset += blocksize;
 		} else {
 			char_ptr = &buf[amount_saved];
-			if (nand_write(&nand_info[0], offset, &blocksize,
+			if (nand_write(&nand_info[0], offset, &len,
 					char_ptr))
 				return 1;
 			offset += blocksize;
-			amount_saved += blocksize;
+			amount_saved += len;
 		}
 	}
 	if (amount_saved != CFG_ENV_SIZE)
@@ -261,21 +262,22 @@ int readenv (size_t offset, u_char * buf)
 {
 	size_t end = offset + CFG_ENV_RANGE;
 	size_t amount_loaded = 0;
-	size_t blocksize;
+	size_t blocksize, len;
 
 	u_char *char_ptr;
 
 	blocksize = nand_info[0].erasesize;
+	len = min(blocksize, CFG_ENV_SIZE);
 
 	while (amount_loaded < CFG_ENV_SIZE && offset < end) {
 		if (nand_block_isbad(&nand_info[0], offset)) {
 			offset += blocksize;
 		} else {
 			char_ptr = &buf[amount_loaded];
-			if (nand_read(&nand_info[0], offset, &blocksize, char_ptr))
+			if (nand_read(&nand_info[0], offset, &len, char_ptr))
 				return 1;
 			offset += blocksize;
-			amount_loaded += blocksize;
+			amount_loaded += len;
 		}
 	}
 	if (amount_loaded != CFG_ENV_SIZE)
@@ -345,12 +347,10 @@ void env_relocate_spec (void)
 void env_relocate_spec (void)
 {
 #if !defined(ENV_IS_EMBEDDED)
-	size_t total;
 	int ret;
 
-	total = CFG_ENV_SIZE;
 	ret = readenv(CFG_ENV_OFFSET, (u_char *) env_ptr);
-	if (ret || total != CFG_ENV_SIZE)
+	if (ret)
 		return use_default();
 
 	if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc)

cpu/arm926ejs/at91sam9/config.mk → cpu/arm926ejs/at91/config.mk

@@ -1,3 +1,3 @@
 PLATFORM_CPPFLAGS += -march=armv5te
 PLATFORM_CPPFLAGS += $(call cc-option,-mtune=arm926ejs,)
-LDSCRIPT := $(SRCTREE)/cpu/arm926ejs/at91sam9/u-boot.lds
+LDSCRIPT := $(SRCTREE)/cpu/arm926ejs/at91/u-boot.lds

cpu/arm926ejs/davinci/nand.c

@@ -42,6 +42,7 @@
  */
 
 #include <common.h>
+#include <asm/io.h>
 
 #ifdef CFG_USE_NAND
 #if !defined(CFG_NAND_LEGACY)
@@ -52,23 +53,23 @@
 
 extern struct nand_chip nand_dev_desc[CFG_MAX_NAND_DEVICE];
 
-static void nand_davinci_hwcontrol(struct mtd_info *mtd, int cmd)
+static void nand_davinci_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 {
 	struct		nand_chip *this = mtd->priv;
 	u_int32_t	IO_ADDR_W = (u_int32_t)this->IO_ADDR_W;
 
 	IO_ADDR_W &= ~(MASK_ALE|MASK_CLE);
 
-	switch (cmd) {
-		case NAND_CTL_SETCLE:
+	if (ctrl & NAND_CTRL_CHANGE) {
+		if ( ctrl & NAND_CLE )
 			IO_ADDR_W |= MASK_CLE;
-			break;
-		case NAND_CTL_SETALE:
+		if ( ctrl & NAND_ALE )
 			IO_ADDR_W |= MASK_ALE;
-			break;
+		this->IO_ADDR_W = (void __iomem *) IO_ADDR_W;
 	}
 
-	this->IO_ADDR_W = (void *)IO_ADDR_W;
+	if (cmd != NAND_CMD_NONE)
+		writeb(cmd, this->IO_ADDR_W);
 }
 
 /* Set WP on deselect, write enable on select */
@@ -88,18 +89,27 @@ static void nand_davinci_select_chip(struct mtd_info *mtd, int chip)
 
 #ifdef CFG_NAND_HW_ECC
 #ifdef CFG_NAND_LARGEPAGE
-static struct nand_oobinfo davinci_nand_oobinfo = {
+static struct nand_ecclayout davinci_nand_ecclayout = {
 	.useecc = MTD_NANDECC_AUTOPLACE,
 	.eccbytes = 12,
 	.eccpos = {8, 9, 10, 24, 25, 26, 40, 41, 42, 56, 57, 58},
-	.oobfree = { {2, 6}, {12, 12}, {28, 12}, {44, 12}, {60, 4} }
+	.oobfree = {
+		{.offset = 2, .length = 6},
+		{.offset = 12, .length = 12},
+		{.offset = 28, .length = 12},
+		{.offset = 44, .length = 12},
+		{.offset = 60, .length = 4}
+	}
 };
 #elif defined(CFG_NAND_SMALLPAGE)
-static struct nand_oobinfo davinci_nand_oobinfo = {
+static struct nand_ecclayout davinci_nand_ecclayout = {
 	.useecc = MTD_NANDECC_AUTOPLACE,
 	.eccbytes = 3,
 	.eccpos = {0, 1, 2},
-	.oobfree = { {6, 2}, {8, 8} }
+	.oobfree = {
+		{.offset = 6, .length = 2},
+		{.offset = 8, .length = 8}
+	}
 };
 #else
 #error "Either CFG_NAND_LARGEPAGE or CFG_NAND_SMALLPAGE must be defined!"
@@ -145,7 +155,7 @@ static int nand_davinci_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u
 	int			region, n;
 	struct nand_chip	*this = mtd->priv;
 
-	n = (this->eccmode == NAND_ECC_HW12_2048) ? 4 : 1;
+	n = (this->ecc.size/512);
 
 	region = 1;
 	while (n--) {
@@ -281,7 +291,7 @@ static int nand_davinci_correct_data(struct mtd_info *mtd, u_char *dat, u_char *
 	int			block_count = 0, i, rc;
 
 	this = mtd->priv;
-	block_count = (this->eccmode == NAND_ECC_HW12_2048) ? 4 : 1;
+	block_count = (this->ecc.size/512);
 	for (i = 0; i < block_count; i++) {
 		if (memcmp(read_ecc, calc_ecc, 3) != 0) {
 			rc = nand_davinci_compare_ecc(read_ecc, calc_ecc, dat);
@@ -306,7 +316,7 @@ static int nand_davinci_dev_ready(struct mtd_info *mtd)
 	return(emif_addr->NANDFSR & 0x1);
 }
 
-static int nand_davinci_waitfunc(struct mtd_info *mtd, struct nand_chip *this, int state)
+static int nand_davinci_waitfunc(struct mtd_info *mtd, struct nand_chip *this)
 {
 	while(!nand_davinci_dev_ready(mtd)) {;}
 	*NAND_CE0CLE = NAND_STATUS;
@@ -362,22 +372,26 @@ int board_nand_init(struct nand_chip *nand)
 #endif
 #ifdef CFG_NAND_HW_ECC
 #ifdef CFG_NAND_LARGEPAGE
-	nand->eccmode     = NAND_ECC_HW12_2048;
+	nand->ecc.mode = NAND_ECC_HW;
+	nand->ecc.size = 2048;
+	nand->ecc.bytes = 12;
 #elif defined(CFG_NAND_SMALLPAGE)
-	nand->eccmode     = NAND_ECC_HW3_512;
+	nand->ecc.mode = NAND_ECC_HW;
+	nand->ecc.size = 512;
+	nand->ecc.bytes = 3;
 #else
 #error "Either CFG_NAND_LARGEPAGE or CFG_NAND_SMALLPAGE must be defined!"
 #endif
-	nand->autooob	  = &davinci_nand_oobinfo;
-	nand->calculate_ecc = nand_davinci_calculate_ecc;
-	nand->correct_data  = nand_davinci_correct_data;
-	nand->enable_hwecc  = nand_davinci_enable_hwecc;
+	nand->ecc.layout  = &davinci_nand_ecclayout;
+	nand->ecc.calculate = nand_davinci_calculate_ecc;
+	nand->ecc.correct  = nand_davinci_correct_data;
+	nand->ecc.hwctl  = nand_davinci_enable_hwecc;
 #else
-	nand->eccmode     = NAND_ECC_SOFT;
+	nand->ecc.mode = NAND_ECC_SOFT;
 #endif
 
 	/* Set address of hardware control function */
-	nand->hwcontrol = nand_davinci_hwcontrol;
+	nand->cmd_ctrl = nand_davinci_hwcontrol;
 
 	nand->dev_ready = nand_davinci_dev_ready;
 	nand->waitfunc = nand_davinci_waitfunc;

cpu/mpc83xx/nand_init.c

@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2004-2008 Freescale Semiconductor, Inc.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <mpc83xx.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * Breathe some life into the CPU...
+ *
+ * Set up the memory map,
+ * initialize a bunch of registers,
+ * initialize the UPM's
+ */
+void cpu_init_f (volatile immap_t * im)
+{
+	int i;
+
+	/* Pointer is writable since we allocated a register for it */
+	gd = (gd_t *) (CFG_INIT_RAM_ADDR + CFG_GBL_DATA_OFFSET);
+
+	/* Clear initial global data */
+	for (i = 0; i < sizeof(gd_t); i++)
+		((char *)gd)[i] = 0;
+
+	/* system performance tweaking */
+
+#ifdef CFG_ACR_PIPE_DEP
+	/* Arbiter pipeline depth */
+	im->arbiter.acr = (im->arbiter.acr & ~ACR_PIPE_DEP) |
+			  (CFG_ACR_PIPE_DEP << ACR_PIPE_DEP_SHIFT);
+#endif
+
+#ifdef CFG_ACR_RPTCNT
+	/* Arbiter repeat count */
+	im->arbiter.acr = (im->arbiter.acr & ~(ACR_RPTCNT)) |
+			  (CFG_ACR_RPTCNT << ACR_RPTCNT_SHIFT);
+#endif
+
+#ifdef CFG_SPCR_OPT
+	/* Optimize transactions between CSB and other devices */
+	im->sysconf.spcr = (im->sysconf.spcr & ~SPCR_OPT) |
+			   (CFG_SPCR_OPT << SPCR_OPT_SHIFT);
+#endif
+
+	/* Enable Time Base & Decrimenter (so we will have udelay()) */
+	im->sysconf.spcr |= SPCR_TBEN;
+
+	/* DDR control driver register */
+#ifdef CFG_DDRCDR
+	im->sysconf.ddrcdr = CFG_DDRCDR;
+#endif
+	/* Output buffer impedance register */
+#ifdef CFG_OBIR
+	im->sysconf.obir = CFG_OBIR;
+#endif
+
+	/*
+	 * Memory Controller:
+	 */
+
+	/* Map banks 0 and 1 to the FLASH banks 0 and 1 at preliminary
+	 * addresses - these have to be modified later when FLASH size
+	 * has been determined
+	 */
+
+#if defined(CFG_NAND_BR_PRELIM)  \
+	&& defined(CFG_NAND_OR_PRELIM) \
+	&& defined(CFG_NAND_LBLAWBAR_PRELIM) \
+	&& defined(CFG_NAND_LBLAWAR_PRELIM)
+	im->lbus.bank[0].br = CFG_NAND_BR_PRELIM;
+	im->lbus.bank[0].or = CFG_NAND_OR_PRELIM;
+	im->sysconf.lblaw[0].bar = CFG_NAND_LBLAWBAR_PRELIM;
+	im->sysconf.lblaw[0].ar = CFG_NAND_LBLAWAR_PRELIM;
+#else
+#error CFG_NAND_BR_PRELIM, CFG_NAND_OR_PRELIM, CFG_NAND_LBLAWBAR_PRELIM & CFG_NAND_LBLAWAR_PRELIM must be defined
+#endif
+}
+
+/*
+ * Get timebase clock frequency (like cpu_clk in Hz)
+ */
+unsigned long get_tbclk(void)
+{
+	return (gd->bus_clk + 3L) / 4L;
+}
+
+void puts(const char *str)
+{
+	while (*str)
+		putc(*str++);
+}

cpu/mpc83xx/start.S

@@ -2,7 +2,7 @@
  * Copyright (C) 1998  Dan Malek <dmalek@jlc.net>
  * Copyright (C) 1999  Magnus Damm <kieraypc01.p.y.kie.era.ericsson.se>
  * Copyright (C) 2000, 2001,2002 Wolfgang Denk <wd@denx.de>
- * Copyright Freescale Semiconductor, Inc. 2004, 2006. All rights reserved.
+ * Copyright Freescale Semiconductor, Inc. 2004, 2006, 2008.
  *
  * See file CREDITS for list of people who contributed to this
  * project.
@@ -57,6 +57,10 @@
 #define MSR_KERNEL (MSR_FP|MSR_ME|MSR_RI)
 #endif
 
+#if !defined(CONFIG_NAND_SPL) && !defined(CFG_RAMBOOT)
+#define CFG_FLASHBOOT
+#endif
+
 /*
  * Set up GOT: Global Offset Table
  *
@@ -64,16 +68,16 @@
  */
 	START_GOT
 	GOT_ENTRY(_GOT2_TABLE_)
-	GOT_ENTRY(_FIXUP_TABLE_)
+	GOT_ENTRY(__bss_start)
+	GOT_ENTRY(_end)
 
+#ifndef CONFIG_NAND_SPL
+	GOT_ENTRY(_FIXUP_TABLE_)
 	GOT_ENTRY(_start)
 	GOT_ENTRY(_start_of_vectors)
 	GOT_ENTRY(_end_of_vectors)
 	GOT_ENTRY(transfer_to_handler)
-
-	GOT_ENTRY(__init_end)
-	GOT_ENTRY(_end)
-	GOT_ENTRY(__bss_start)
+#endif
 	END_GOT
 
 /*
@@ -165,7 +169,7 @@ boot_warm: /* time t 5 */
 
 	bl	init_e300_core
 
-#ifndef CFG_RAMBOOT
+#ifdef CFG_FLASHBOOT
 
 	/* Inflate flash location so it appears everywhere, calculate */
 	/* the absolute address in final location of the FLASH, jump  */
@@ -181,7 +185,7 @@ in_flash:
 #if 1 /* Remapping flash with LAW0. */
 	bl remap_flash_by_law0
 #endif
-#endif	/* CFG_RAMBOOT */
+#endif	/* CFG_FLASHBOOT */
 
 	/* setup the bats */
 	bl	setup_bats
@@ -239,6 +243,7 @@ in_flash:
 	/* run 1st part of board init code (in Flash)*/
 	bl	board_init_f
 
+#ifndef CONFIG_NAND_SPL
 /*
  * Vector Table
  */
@@ -428,6 +433,7 @@ int_return:
 	lwz	r1,GPR1(r1)
 	SYNC
 	rfi
+#endif /* !CONFIG_NAND_SPL */
 
 /*
  * This code initialises the E300 processor core
@@ -496,88 +502,10 @@ init_e300_core: /* time t 10 */
 	SYNC
 	mtspr	HID2, r3
 
-	/* clear all BAT's					*/
-	/*----------------------------------*/
-
-	xor	r0, r0, r0
-	mtspr	DBAT0U, r0
-	mtspr	DBAT0L, r0
-	mtspr	DBAT1U, r0
-	mtspr	DBAT1L, r0
-	mtspr	DBAT2U, r0
-	mtspr	DBAT2L, r0
-	mtspr	DBAT3U, r0
-	mtspr	DBAT3L, r0
-	mtspr	IBAT0U, r0
-	mtspr	IBAT0L, r0
-	mtspr	IBAT1U, r0
-	mtspr	IBAT1L, r0
-	mtspr	IBAT2U, r0
-	mtspr	IBAT2L, r0
-	mtspr	IBAT3U, r0
-	mtspr	IBAT3L, r0
-	SYNC
-
-	/* invalidate all tlb's
-	 *
-	 * From the 603e User Manual: "The 603e provides the ability to
-	 * invalidate a TLB entry. The TLB Invalidate Entry (tlbie)
-	 * instruction invalidates the TLB entry indexed by the EA, and
-	 * operates on both the instruction and data TLBs simultaneously
-	 * invalidating four TLB entries (both sets in each TLB). The
-	 * index corresponds to bits 15-19 of the EA. To invalidate all
-	 * entries within both TLBs, 32 tlbie instructions should be
-	 * issued, incrementing this field by one each time."
-	 *
-	 * "Note that the tlbia instruction is not implemented on the
-	 * 603e."
-	 *
-	 * bits 15-19 correspond to addresses 0x00000000 to 0x0001F000
-	 * incrementing by 0x1000 each time. The code below is sort of
-	 * based on code in "flush_tlbs" from arch/ppc/kernel/head.S
-	 *
-	 */
-
-	li	r3, 32
-	mtctr	r3
-	li	r3, 0
-1:	tlbie	r3
-	addi	r3, r3, 0x1000
-	bdnz	1b
-	SYNC
-
 	/* Done!						*/
 	/*------------------------------*/
 	blr
 
-	.globl	invalidate_bats
-invalidate_bats:
-	/* invalidate BATs */
-	mtspr	IBAT0U, r0
-	mtspr	IBAT1U, r0
-	mtspr	IBAT2U, r0
-	mtspr	IBAT3U, r0
-#ifdef CONFIG_HIGH_BATS
-	mtspr   IBAT4U, r0
-	mtspr   IBAT5U, r0
-	mtspr   IBAT6U, r0
-	mtspr   IBAT7U, r0
-#endif
-	isync
-	mtspr	DBAT0U, r0
-	mtspr	DBAT1U, r0
-	mtspr	DBAT2U, r0
-	mtspr	DBAT3U, r0
-#ifdef CONFIG_HIGH_BATS
-	mtspr   DBAT4U, r0
-	mtspr   DBAT5U, r0
-	mtspr   DBAT6U, r0
-	mtspr   DBAT7U, r0
-#endif
-	isync
-	sync
-	blr
-
 	/* setup_bats - set them up to some initial state */
 	.globl	setup_bats
 setup_bats:
@@ -590,7 +518,6 @@ setup_bats:
 	ori	r3, r3, CFG_IBAT0U@l
 	mtspr	IBAT0L, r4
 	mtspr	IBAT0U, r3
-	isync
 
 	/* DBAT 0 */
 	addis	r4, r0, CFG_DBAT0L@h
@@ -599,7 +526,6 @@ setup_bats:
 	ori	r3, r3, CFG_DBAT0U@l
 	mtspr	DBAT0L, r4
 	mtspr	DBAT0U, r3
-	isync
 
 	/* IBAT 1 */
 	addis	r4, r0, CFG_IBAT1L@h
@@ -608,7 +534,6 @@ setup_bats:
 	ori	r3, r3, CFG_IBAT1U@l
 	mtspr	IBAT1L, r4
 	mtspr	IBAT1U, r3
-	isync
 
 	/* DBAT 1 */
 	addis	r4, r0, CFG_DBAT1L@h
@@ -617,7 +542,6 @@ setup_bats:
 	ori	r3, r3, CFG_DBAT1U@l
 	mtspr	DBAT1L, r4
 	mtspr	DBAT1U, r3
-	isync
 
 	/* IBAT 2 */
 	addis	r4, r0, CFG_IBAT2L@h
@@ -626,7 +550,6 @@ setup_bats:
 	ori	r3, r3, CFG_IBAT2U@l
 	mtspr	IBAT2L, r4
 	mtspr	IBAT2U, r3
-	isync
 
 	/* DBAT 2 */
 	addis	r4, r0, CFG_DBAT2L@h
@@ -635,7 +558,6 @@ setup_bats:
 	ori	r3, r3, CFG_DBAT2U@l
 	mtspr	DBAT2L, r4
 	mtspr	DBAT2U, r3
-	isync
 
 	/* IBAT 3 */
 	addis	r4, r0, CFG_IBAT3L@h
@@ -644,7 +566,6 @@ setup_bats:
 	ori	r3, r3, CFG_IBAT3U@l
 	mtspr	IBAT3L, r4
 	mtspr	IBAT3U, r3
-	isync
 
 	/* DBAT 3 */
 	addis	r4, r0, CFG_DBAT3L@h
@@ -653,7 +574,6 @@ setup_bats:
 	ori	r3, r3, CFG_DBAT3U@l
 	mtspr	DBAT3L, r4
 	mtspr	DBAT3U, r3
-	isync
 
 #ifdef CONFIG_HIGH_BATS
 	/* IBAT 4 */
@@ -663,7 +583,6 @@ setup_bats:
 	ori     r3, r3, CFG_IBAT4U@l
 	mtspr   IBAT4L, r4
 	mtspr   IBAT4U, r3
-	isync
 
 	/* DBAT 4 */
 	addis   r4, r0, CFG_DBAT4L@h
@@ -672,7 +591,6 @@ setup_bats:
 	ori     r3, r3, CFG_DBAT4U@l
 	mtspr   DBAT4L, r4
 	mtspr   DBAT4U, r3
-	isync
 
 	/* IBAT 5 */
 	addis   r4, r0, CFG_IBAT5L@h
@@ -681,7 +599,6 @@ setup_bats:
 	ori     r3, r3, CFG_IBAT5U@l
 	mtspr   IBAT5L, r4
 	mtspr   IBAT5U, r3
-	isync
 
 	/* DBAT 5 */
 	addis   r4, r0, CFG_DBAT5L@h
@@ -690,7 +607,6 @@ setup_bats:
 	ori     r3, r3, CFG_DBAT5U@l
 	mtspr   DBAT5L, r4
 	mtspr   DBAT5U, r3
-	isync
 
 	/* IBAT 6 */
 	addis   r4, r0, CFG_IBAT6L@h
@@ -699,7 +615,6 @@ setup_bats:
 	ori     r3, r3, CFG_IBAT6U@l
 	mtspr   IBAT6L, r4
 	mtspr   IBAT6U, r3
-	isync
 
 	/* DBAT 6 */
 	addis   r4, r0, CFG_DBAT6L@h
@@ -708,7 +623,6 @@ setup_bats:
 	ori     r3, r3, CFG_DBAT6U@l
 	mtspr   DBAT6L, r4
 	mtspr   DBAT6U, r3
-	isync
 
 	/* IBAT 7 */
 	addis   r4, r0, CFG_IBAT7L@h
@@ -717,7 +631,6 @@ setup_bats:
 	ori     r3, r3, CFG_IBAT7U@l
 	mtspr   IBAT7L, r4
 	mtspr   IBAT7U, r3
-	isync
 
 	/* DBAT 7 */
 	addis   r4, r0, CFG_DBAT7L@h
@@ -726,12 +639,28 @@ setup_bats:
 	ori     r3, r3, CFG_DBAT7U@l
 	mtspr   DBAT7L, r4
 	mtspr   DBAT7U, r3
-	isync
 #endif
 
-	/* Invalidate TLBs.
-	 * -> for (val = 0; val < 0x20000; val+=0x1000)
-	 * ->   tlbie(val);
+	isync
+
+	/* invalidate all tlb's
+	 *
+	 * From the 603e User Manual: "The 603e provides the ability to
+	 * invalidate a TLB entry. The TLB Invalidate Entry (tlbie)
+	 * instruction invalidates the TLB entry indexed by the EA, and
+	 * operates on both the instruction and data TLBs simultaneously
+	 * invalidating four TLB entries (both sets in each TLB). The
+	 * index corresponds to bits 15-19 of the EA. To invalidate all
+	 * entries within both TLBs, 32 tlbie instructions should be
+	 * issued, incrementing this field by one each time."
+	 *
+	 * "Note that the tlbia instruction is not implemented on the
+	 * 603e."
+	 *
+	 * bits 15-19 correspond to addresses 0x00000000 to 0x0001F000
+	 * incrementing by 0x1000 each time. The code below is sort of
+	 * based on code in "flush_tlbs" from arch/ppc/kernel/head.S
+	 *
 	 */
 	lis	r3, 0
 	lis	r5, 2
@@ -874,7 +803,7 @@ relocate_code:
 	mr	r3,  r5				/* Destination Address */
 	lis	r4, CFG_MONITOR_BASE@h		/* Source      Address */
 	ori	r4, r4, CFG_MONITOR_BASE@l
-	lwz	r5, GOT(__init_end)
+	lwz	r5, GOT(__bss_start)
 	sub	r5, r5, r4
 	li	r6, CFG_CACHELINE_SIZE		/* Cache Line Size */
 
@@ -987,6 +916,7 @@ in_ram:
 	stw	r0,0(r3)
 	bdnz	1b
 
+#ifndef CONFIG_NAND_SPL
 	/*
 	 * Now adjust the fixups and the pointers to the fixups
 	 * in case we need to move ourselves again.
@@ -1004,6 +934,8 @@ in_ram:
 	stw	r0,0(r4)
 	bdnz	3b
 4:
+#endif
+
 clear_bss:
 	/*
 	 * Now clear BSS segment
@@ -1037,6 +969,7 @@ clear_bss:
 	mr	r4, r10		/* Destination Address		*/
 	bl	board_init_r
 
+#ifndef CONFIG_NAND_SPL
 	/*
 	 * Copy exception vector code to low memory
 	 *
@@ -1119,6 +1052,7 @@ trap_reloc:
 	stw	r0, 4(r7)
 
 	blr
+#endif /* !CONFIG_NAND_SPL */
 
 #ifdef CFG_INIT_RAM_LOCK
 lock_ram_in_cache:
@@ -1142,6 +1076,7 @@ lock_ram_in_cache:
 	sync
 	blr
 
+#ifndef CONFIG_NAND_SPL
 .globl unlock_ram_in_cache
 unlock_ram_in_cache:
 	/* invalidate the INIT_RAM section */
@@ -1165,8 +1100,10 @@ unlock_ram_in_cache:
 	mtspr	HID0, r3		/* no invalidate, unlock */
 	sync
 	blr
-#endif
+#endif /* !CONFIG_NAND_SPL */
+#endif /* CFG_INIT_RAM_LOCK */
 
+#ifdef CFG_FLASHBOOT
 map_flash_by_law1:
 	/* When booting from ROM (Flash or EPROM), clear the  */
 	/* Address Mask in OR0 so ROM appears everywhere      */
@@ -1245,3 +1182,4 @@ remap_flash_by_law0:
 	stw r4, LBLAWBAR1(r3)
 	stw r4, LBLAWAR1(r3) /* Off LBIU LAW1 */
 	blr
+#endif /* CFG_FLASHBOOT */

cpu/ppc4xx/ndfc.c

@@ -44,65 +44,39 @@
 #include <asm/io.h>
 #include <ppc4xx.h>
 
-static u8 hwctl = 0;
+/*
+ * We need to store the info, which chip-select (CS) is used for the
+ * chip number. For example on Sequoia NAND chip #0 uses
+ * CS #3.
+ */
+static int ndfc_cs[NDFC_MAX_BANKS];
 
-static void ndfc_hwcontrol(struct mtd_info *mtdinfo, int cmd)
+static void ndfc_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 {
-	switch (cmd) {
-	case NAND_CTL_SETCLE:
-		hwctl |= 0x1;
-		break;
-
-	case NAND_CTL_CLRCLE:
-		hwctl &= ~0x1;
-		break;
-
-	case NAND_CTL_SETALE:
-		hwctl |= 0x2;
-		break;
-
-	case NAND_CTL_CLRALE:
-		hwctl &= ~0x2;
-		break;
-	}
-}
+	struct nand_chip *this = mtd->priv;
+	ulong base = (ulong) this->IO_ADDR_W & 0xffffff00;
 
-static void ndfc_write_byte(struct mtd_info *mtdinfo, u_char byte)
-{
-	struct nand_chip *this = mtdinfo->priv;
-	ulong base = (ulong) this->IO_ADDR_W & 0xfffffffc;
+	if (cmd == NAND_CMD_NONE)
+		return;
 
-	if (hwctl & 0x1)
-		out_8((u8 *)(base + NDFC_CMD), byte);
-	else if (hwctl & 0x2)
-		out_8((u8 *)(base + NDFC_ALE), byte);
+	if (ctrl & NAND_CLE)
+		out_8((u8 *)(base + NDFC_CMD), cmd & 0xFF);
 	else
-		out_8((u8 *)(base + NDFC_DATA), byte);
-}
-
-static u_char ndfc_read_byte(struct mtd_info *mtdinfo)
-{
-	struct nand_chip *this = mtdinfo->priv;
-	ulong base = (ulong) this->IO_ADDR_W & 0xfffffffc;
-
-	return (in_8((u8 *)(base + NDFC_DATA)));
+		out_8((u8 *)(base + NDFC_ALE), cmd & 0xFF);
 }
 
 static int ndfc_dev_ready(struct mtd_info *mtdinfo)
 {
 	struct nand_chip *this = mtdinfo->priv;
-	ulong base = (ulong) this->IO_ADDR_W & 0xfffffffc;
-
-	while (!(in_be32((u32 *)(base + NDFC_STAT)) & NDFC_STAT_IS_READY))
-		;
+	ulong base = (ulong) this->IO_ADDR_W & 0xffffff00;
 
-	return 1;
+	return (in_be32((u32 *)(base + NDFC_STAT)) & NDFC_STAT_IS_READY);
 }
 
 static void ndfc_enable_hwecc(struct mtd_info *mtdinfo, int mode)
 {
 	struct nand_chip *this = mtdinfo->priv;
-	ulong base = (ulong) this->IO_ADDR_W & 0xfffffffc;
+	ulong base = (ulong) this->IO_ADDR_W & 0xffffff00;
 	u32 ccr;
 
 	ccr = in_be32((u32 *)(base + NDFC_CCR));
@@ -114,7 +88,7 @@ static int ndfc_calculate_ecc(struct mtd_info *mtdinfo,
 			      const u_char *dat, u_char *ecc_code)
 {
 	struct nand_chip *this = mtdinfo->priv;
-	ulong base = (ulong) this->IO_ADDR_W & 0xfffffffc;
+	ulong base = (ulong) this->IO_ADDR_W & 0xffffff00;
 	u32 ecc;
 	u8 *p = (u8 *)&ecc;
 
@@ -139,7 +113,7 @@ static int ndfc_calculate_ecc(struct mtd_info *mtdinfo,
 static void ndfc_read_buf(struct mtd_info *mtdinfo, uint8_t *buf, int len)
 {
 	struct nand_chip *this = mtdinfo->priv;
-	ulong base = (ulong) this->IO_ADDR_W & 0xfffffffc;
+	ulong base = (ulong) this->IO_ADDR_W & 0xffffff00;
 	uint32_t *p = (uint32_t *) buf;
 
 	for (;len > 0; len -= 4)
@@ -154,7 +128,7 @@ static void ndfc_read_buf(struct mtd_info *mtdinfo, uint8_t *buf, int len)
 static void ndfc_write_buf(struct mtd_info *mtdinfo, const uint8_t *buf, int len)
 {
 	struct nand_chip *this = mtdinfo->priv;
-	ulong base = (ulong) this->IO_ADDR_W & 0xfffffffc;
+	ulong base = (ulong) this->IO_ADDR_W & 0xffffff00;
 	uint32_t *p = (uint32_t *) buf;
 
 	for (; len > 0; len -= 4)
@@ -164,7 +138,7 @@ static void ndfc_write_buf(struct mtd_info *mtdinfo, const uint8_t *buf, int len
 static int ndfc_verify_buf(struct mtd_info *mtdinfo, const uint8_t *buf, int len)
 {
 	struct nand_chip *this = mtdinfo->priv;
-	ulong base = (ulong) this->IO_ADDR_W & 0xfffffffc;
+	ulong base = (ulong) this->IO_ADDR_W & 0xffffff00;
 	uint32_t *p = (uint32_t *) buf;
 
 	for (; len > 0; len -= 4)
@@ -181,29 +155,43 @@ void board_nand_select_device(struct nand_chip *nand, int chip)
 	 * Don't use "chip" to address the NAND device,
 	 * generate the cs from the address where it is encoded.
 	 */
-	int cs = (ulong)nand->IO_ADDR_W & 0x00000003;
-	ulong base = (ulong)nand->IO_ADDR_W & 0xfffffffc;
+	ulong base = (ulong)nand->IO_ADDR_W & 0xffffff00;
+	int cs = ndfc_cs[chip];
 
 	/* Set NandFlash Core Configuration Register */
 	/* 1 col x 2 rows */
 	out_be32((u32 *)(base + NDFC_CCR), 0x00000000 | (cs << 24));
+	out_be32((u32 *)(base + NDFC_BCFG0 + (cs << 2)), 0x80002222);
 }
 
 int board_nand_init(struct nand_chip *nand)
 {
 	int cs = (ulong)nand->IO_ADDR_W & 0x00000003;
-	ulong base = (ulong)nand->IO_ADDR_W & 0xfffffffc;
+	ulong base = (ulong)nand->IO_ADDR_W & 0xffffff00;
+	static int chip = 0;
 
-	nand->hwcontrol  = ndfc_hwcontrol;
-	nand->read_byte  = ndfc_read_byte;
-	nand->read_buf   = ndfc_read_buf;
-	nand->write_byte = ndfc_write_byte;
-	nand->dev_ready  = ndfc_dev_ready;
+	/*
+	 * Save chip-select for this chip #
+	 */
+	ndfc_cs[chip] = cs;
 
-	nand->eccmode = NAND_ECC_HW3_256;
-	nand->enable_hwecc = ndfc_enable_hwecc;
-	nand->calculate_ecc = ndfc_calculate_ecc;
-	nand->correct_data = nand_correct_data;
+	/*
+	 * Select required NAND chip in NDFC
+	 */
+	board_nand_select_device(nand, chip);
+
+	nand->IO_ADDR_R = (void __iomem *)(base + NDFC_DATA);
+	nand->IO_ADDR_W = (void __iomem *)(base + NDFC_DATA);
+	nand->cmd_ctrl = ndfc_hwcontrol;
+	nand->chip_delay = 50;
+	nand->read_buf = ndfc_read_buf;
+	nand->dev_ready = ndfc_dev_ready;
+	nand->ecc.correct = nand_correct_data;
+	nand->ecc.hwctl = ndfc_enable_hwecc;
+	nand->ecc.calculate = ndfc_calculate_ecc;
+	nand->ecc.mode = NAND_ECC_HW;
+	nand->ecc.size = 256;
+	nand->ecc.bytes = 3;
 
 #ifndef CONFIG_NAND_SPL
 	nand->write_buf  = ndfc_write_buf;
@@ -218,11 +206,7 @@ int board_nand_init(struct nand_chip *nand)
 	mtebc(pb0ap, CFG_EBC_PB0AP);
 #endif
 
-	/*
-	 * Select required NAND chip in NDFC
-	 */
-	board_nand_select_device(nand, cs);
-	out_be32((u32 *)(base + NDFC_BCFG0 + (cs << 2)), 0x80002222);
+	chip++;
 
 	return 0;
 }

doc/README.nand

@@ -57,14 +57,9 @@ Commands:
       Print information about all of the NAND devices found.
 
    nand read addr ofs|partition size
-      Read `size' bytes from `ofs' in NAND flash to `addr'. If a page
-      cannot be read because it is marked bad or an uncorrectable data
-      error is found the command stops with an error.
-
-   nand read.jffs2 addr ofs|partition size
-      Like `read', but the data for blocks that are marked bad is read as
-      0xff. This gives a readable JFFS2 image that can be processed by
-      the JFFS2 commands such as ls and fsload.
+      Read `size' bytes from `ofs' in NAND flash to `addr'.  Blocks that
+      are marked bad are skipped.  If a page cannot be read because an
+      uncorrectable data error is found, the command stops with an error.
 
    nand read.oob addr ofs|partition size
       Read `size' bytes from the out-of-band data area corresponding to
@@ -73,17 +68,15 @@ Commands:
       for bad blocks or ECC errors.
 
    nand write addr ofs|partition size
-      Write `size' bytes from `addr' to `ofs' in NAND flash. If a page
-      cannot be written because it is marked bad or the write fails the
-      command stops with an error.
-
-   nand write.jffs2 addr ofs|partition size
-      Like `write', but blocks that are marked bad are skipped and the
-      data is written to the next block instead. This allows writing
-      a JFFS2 image, as long as the image is short enough to fit even
-      after skipping the bad blocks. Compact images, such as those
-      produced by mkfs.jffs2 should work well, but loading an image copied
-      from another flash is going to be trouble if there are any bad blocks.
+      Write `size' bytes from `addr' to `ofs' in NAND flash.  Blocks that
+      are marked bad are skipped.  If a page cannot be read because an
+      uncorrectable data error is found, the command stops with an error.
+
+      As JFFS2 skips blocks similarly, this allows writing a JFFS2 image,
+      as long as the image is short enough to fit even after skipping the
+      bad blocks.  Compact images, such as those produced by mkfs.jffs2
+      should work well, but loading an image copied from another flash is
+      going to be trouble if there are any bad blocks.
 
    nand write.oob addr ofs|partition size
       Write `size' bytes from `addr' to the out-of-band data area
@@ -215,12 +208,6 @@ JFFS2 related commands:
   using both the new code which is able to skip bad blocks
   "nand erase clean" additionally writes JFFS2-cleanmarkers in the oob.
 
-  "nand write.jffs2"
-  like "nand write" but skip found bad eraseblocks
-
-  "nand read.jffs2"
-  like "nand read" but skip found bad eraseblocks
-
 Miscellaneous and testing commands:
   "markbad [offset]"
   create an artificial bad block (for testing bad block handling)

drivers/mtd/nand/Makefile

@@ -32,6 +32,7 @@ COBJS-y += nand_ecc.o
 COBJS-y += nand_bbt.o
 COBJS-y += nand_util.o
 
+COBJS-$(CONFIG_NAND_FSL_ELBC) += fsl_elbc_nand.o
 COBJS-y += fsl_upm.o
 
 COBJS	:= $(COBJS-y)

drivers/mtd/nand/fsl_elbc_nand.c

@@ -0,0 +1,767 @@
+/* Freescale Enhanced Local Bus Controller FCM NAND driver
+ *
+ * Copyright (c) 2006-2008 Freescale Semiconductor
+ *
+ * Authors: Nick Spence <nick.spence@freescale.com>,
+ *          Scott Wood <scottwood@freescale.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <common.h>
+#include <malloc.h>
+
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/nand_ecc.h>
+
+#include <asm/io.h>
+#include <asm/errno.h>
+
+#ifdef VERBOSE_DEBUG
+#define DEBUG_ELBC
+#define vdbg(format, arg...) printf("DEBUG: " format, ##arg)
+#else
+#define vdbg(format, arg...) do {} while (0)
+#endif
+
+/* Can't use plain old DEBUG because the linux mtd
+ * headers define it as a macro.
+ */
+#ifdef DEBUG_ELBC
+#define dbg(format, arg...) printf("DEBUG: " format, ##arg)
+#else
+#define dbg(format, arg...) do {} while (0)
+#endif
+
+#define MAX_BANKS 8
+#define ERR_BYTE 0xFF /* Value returned for read bytes when read failed */
+#define FCM_TIMEOUT_MSECS 10 /* Maximum number of mSecs to wait for FCM */
+
+#define LTESR_NAND_MASK (LTESR_FCT | LTESR_PAR | LTESR_CC)
+
+struct fsl_elbc_ctrl;
+
+/* mtd information per set */
+
+struct fsl_elbc_mtd {
+	struct mtd_info mtd;
+	struct nand_chip chip;
+	struct fsl_elbc_ctrl *ctrl;
+
+	struct device *dev;
+	int bank;               /* Chip select bank number           */
+	u8 __iomem *vbase;      /* Chip select base virtual address  */
+	int page_size;          /* NAND page size (0=512, 1=2048)    */
+	unsigned int fmr;       /* FCM Flash Mode Register value     */
+};
+
+/* overview of the fsl elbc controller */
+
+struct fsl_elbc_ctrl {
+	struct nand_hw_control controller;
+	struct fsl_elbc_mtd *chips[MAX_BANKS];
+
+	/* device info */
+	lbus83xx_t *regs;
+	u8 __iomem *addr;        /* Address of assigned FCM buffer        */
+	unsigned int page;       /* Last page written to / read from      */
+	unsigned int read_bytes; /* Number of bytes read during command   */
+	unsigned int column;     /* Saved column from SEQIN               */
+	unsigned int index;      /* Pointer to next byte to 'read'        */
+	unsigned int status;     /* status read from LTESR after last op  */
+	unsigned int mdr;        /* UPM/FCM Data Register value           */
+	unsigned int use_mdr;    /* Non zero if the MDR is to be set      */
+	unsigned int oob;        /* Non zero if operating on OOB data     */
+	uint8_t *oob_poi;        /* Place to write ECC after read back    */
+};
+
+/* These map to the positions used by the FCM hardware ECC generator */
+
+/* Small Page FLASH with FMR[ECCM] = 0 */
+static struct nand_ecclayout fsl_elbc_oob_sp_eccm0 = {
+	.eccbytes = 3,
+	.eccpos = {6, 7, 8},
+	.oobfree = { {0, 5}, {9, 7} },
+	.oobavail = 12,
+};
+
+/* Small Page FLASH with FMR[ECCM] = 1 */
+static struct nand_ecclayout fsl_elbc_oob_sp_eccm1 = {
+	.eccbytes = 3,
+	.eccpos = {8, 9, 10},
+	.oobfree = { {0, 5}, {6, 2}, {11, 5} },
+	.oobavail = 12,
+};
+
+/* Large Page FLASH with FMR[ECCM] = 0 */
+static struct nand_ecclayout fsl_elbc_oob_lp_eccm0 = {
+	.eccbytes = 12,
+	.eccpos = {6, 7, 8, 22, 23, 24, 38, 39, 40, 54, 55, 56},
+	.oobfree = { {1, 5}, {9, 13}, {25, 13}, {41, 13}, {57, 7} },
+	.oobavail = 48,
+};
+
+/* Large Page FLASH with FMR[ECCM] = 1 */
+static struct nand_ecclayout fsl_elbc_oob_lp_eccm1 = {
+	.eccbytes = 12,
+	.eccpos = {8, 9, 10, 24, 25, 26, 40, 41, 42, 56, 57, 58},
+	.oobfree = { {1, 7}, {11, 13}, {27, 13}, {43, 13}, {59, 5} },
+	.oobavail = 48,
+};
+
+/*=================================*/
+
+/*
+ * Set up the FCM hardware block and page address fields, and the fcm
+ * structure addr field to point to the correct FCM buffer in memory
+ */
+static void set_addr(struct mtd_info *mtd, int column, int page_addr, int oob)
+{
+	struct nand_chip *chip = mtd->priv;
+	struct fsl_elbc_mtd *priv = chip->priv;
+	struct fsl_elbc_ctrl *ctrl = priv->ctrl;
+	lbus83xx_t *lbc = ctrl->regs;
+	int buf_num;
+
+	ctrl->page = page_addr;
+
+	if (priv->page_size) {
+		out_be32(&lbc->fbar, page_addr >> 6);
+		out_be32(&lbc->fpar,
+		         ((page_addr << FPAR_LP_PI_SHIFT) & FPAR_LP_PI) |
+		         (oob ? FPAR_LP_MS : 0) | column);
+		buf_num = (page_addr & 1) << 2;
+	} else {
+		out_be32(&lbc->fbar, page_addr >> 5);
+		out_be32(&lbc->fpar,
+		         ((page_addr << FPAR_SP_PI_SHIFT) & FPAR_SP_PI) |
+		         (oob ? FPAR_SP_MS : 0) | column);
+		buf_num = page_addr & 7;
+	}
+
+	ctrl->addr = priv->vbase + buf_num * 1024;
+	ctrl->index = column;
+
+	/* for OOB data point to the second half of the buffer */
+	if (oob)
+		ctrl->index += priv->page_size ? 2048 : 512;
+
+	vdbg("set_addr: bank=%d, ctrl->addr=0x%p (0x%p), "
+	     "index %x, pes %d ps %d\n",
+	     buf_num, ctrl->addr, priv->vbase, ctrl->index,
+	     chip->phys_erase_shift, chip->page_shift);
+}
+
+/*
+ * execute FCM command and wait for it to complete
+ */
+static int fsl_elbc_run_command(struct mtd_info *mtd)
+{
+	struct nand_chip *chip = mtd->priv;
+	struct fsl_elbc_mtd *priv = chip->priv;
+	struct fsl_elbc_ctrl *ctrl = priv->ctrl;
+	lbus83xx_t *lbc = ctrl->regs;
+	long long end_tick;
+	u32 ltesr;
+
+	/* Setup the FMR[OP] to execute without write protection */
+	out_be32(&lbc->fmr, priv->fmr | 3);
+	if (ctrl->use_mdr)
+		out_be32(&lbc->mdr, ctrl->mdr);
+
+	vdbg("fsl_elbc_run_command: fmr=%08x fir=%08x fcr=%08x\n",
+	     in_be32(&lbc->fmr), in_be32(&lbc->fir), in_be32(&lbc->fcr));
+	vdbg("fsl_elbc_run_command: fbar=%08x fpar=%08x "
+	     "fbcr=%08x bank=%d\n",
+	     in_be32(&lbc->fbar), in_be32(&lbc->fpar),
+	     in_be32(&lbc->fbcr), priv->bank);
+
+	/* execute special operation */
+	out_be32(&lbc->lsor, priv->bank);
+
+	/* wait for FCM complete flag or timeout */
+	end_tick = usec2ticks(FCM_TIMEOUT_MSECS * 1000) + get_ticks();
+
+	ltesr = 0;
+	while (end_tick > get_ticks()) {
+		ltesr = in_be32(&lbc->ltesr);
+		if (ltesr & LTESR_CC)
+			break;
+	}
+
+	ctrl->status = ltesr & LTESR_NAND_MASK;
+	out_be32(&lbc->ltesr, ctrl->status);
+	out_be32(&lbc->lteatr, 0);
+
+	/* store mdr value in case it was needed */
+	if (ctrl->use_mdr)
+		ctrl->mdr = in_be32(&lbc->mdr);
+
+	ctrl->use_mdr = 0;
+
+	vdbg("fsl_elbc_run_command: stat=%08x mdr=%08x fmr=%08x\n",
+	     ctrl->status, ctrl->mdr, in_be32(&lbc->fmr));
+
+	/* returns 0 on success otherwise non-zero) */
+	return ctrl->status == LTESR_CC ? 0 : -EIO;
+}
+
+static void fsl_elbc_do_read(struct nand_chip *chip, int oob)
+{
+	struct fsl_elbc_mtd *priv = chip->priv;
+	struct fsl_elbc_ctrl *ctrl = priv->ctrl;
+	lbus83xx_t *lbc = ctrl->regs;
+
+	if (priv->page_size) {
+		out_be32(&lbc->fir,
+		         (FIR_OP_CW0 << FIR_OP0_SHIFT) |
+		         (FIR_OP_CA  << FIR_OP1_SHIFT) |
+		         (FIR_OP_PA  << FIR_OP2_SHIFT) |
+		         (FIR_OP_CW1 << FIR_OP3_SHIFT) |
+		         (FIR_OP_RBW << FIR_OP4_SHIFT));
+
+		out_be32(&lbc->fcr, (NAND_CMD_READ0 << FCR_CMD0_SHIFT) |
+		                    (NAND_CMD_READSTART << FCR_CMD1_SHIFT));
+	} else {
+		out_be32(&lbc->fir,
+		         (FIR_OP_CW0 << FIR_OP0_SHIFT) |
+		         (FIR_OP_CA  << FIR_OP1_SHIFT) |
+		         (FIR_OP_PA  << FIR_OP2_SHIFT) |
+		         (FIR_OP_RBW << FIR_OP3_SHIFT));
+
+		if (oob)
+			out_be32(&lbc->fcr,
+			         NAND_CMD_READOOB << FCR_CMD0_SHIFT);
+		else
+			out_be32(&lbc->fcr, NAND_CMD_READ0 << FCR_CMD0_SHIFT);
+	}
+}
+
+/* cmdfunc send commands to the FCM */
+static void fsl_elbc_cmdfunc(struct mtd_info *mtd, unsigned int command,
+                             int column, int page_addr)
+{
+	struct nand_chip *chip = mtd->priv;
+	struct fsl_elbc_mtd *priv = chip->priv;
+	struct fsl_elbc_ctrl *ctrl = priv->ctrl;
+	lbus83xx_t *lbc = ctrl->regs;
+
+	ctrl->use_mdr = 0;
+
+	/* clear the read buffer */
+	ctrl->read_bytes = 0;
+	if (command != NAND_CMD_PAGEPROG)
+		ctrl->index = 0;
+
+	switch (command) {
+	/* READ0 and READ1 read the entire buffer to use hardware ECC. */
+	case NAND_CMD_READ1:
+		column += 256;
+
+	/* fall-through */
+	case NAND_CMD_READ0:
+		vdbg("fsl_elbc_cmdfunc: NAND_CMD_READ0, page_addr:"
+		     " 0x%x, column: 0x%x.\n", page_addr, column);
+
+		out_be32(&lbc->fbcr, 0); /* read entire page to enable ECC */
+		set_addr(mtd, 0, page_addr, 0);
+
+		ctrl->read_bytes = mtd->writesize + mtd->oobsize;
+		ctrl->index += column;
+
+		fsl_elbc_do_read(chip, 0);
+		fsl_elbc_run_command(mtd);
+		return;
+
+	/* READOOB reads only the OOB because no ECC is performed. */
+	case NAND_CMD_READOOB:
+		vdbg("fsl_elbc_cmdfunc: NAND_CMD_READOOB, page_addr:"
+		     " 0x%x, column: 0x%x.\n", page_addr, column);
+
+		out_be32(&lbc->fbcr, mtd->oobsize - column);
+		set_addr(mtd, column, page_addr, 1);
+
+		ctrl->read_bytes = mtd->writesize + mtd->oobsize;
+
+		fsl_elbc_do_read(chip, 1);
+		fsl_elbc_run_command(mtd);
+
+		return;
+
+	/* READID must read all 5 possible bytes while CEB is active */
+	case NAND_CMD_READID:
+		vdbg("fsl_elbc_cmdfunc: NAND_CMD_READID.\n");
+
+		out_be32(&lbc->fir, (FIR_OP_CW0 << FIR_OP0_SHIFT) |
+		                    (FIR_OP_UA  << FIR_OP1_SHIFT) |
+		                    (FIR_OP_RBW << FIR_OP2_SHIFT));
+		out_be32(&lbc->fcr, NAND_CMD_READID << FCR_CMD0_SHIFT);
+		/* 5 bytes for manuf, device and exts */
+		out_be32(&lbc->fbcr, 5);
+		ctrl->read_bytes = 5;
+		ctrl->use_mdr = 1;
+		ctrl->mdr = 0;
+
+		set_addr(mtd, 0, 0, 0);
+		fsl_elbc_run_command(mtd);
+		return;
+
+	/* ERASE1 stores the block and page address */
+	case NAND_CMD_ERASE1:
+		vdbg("fsl_elbc_cmdfunc: NAND_CMD_ERASE1, "
+		     "page_addr: 0x%x.\n", page_addr);
+		set_addr(mtd, 0, page_addr, 0);
+		return;
+
+	/* ERASE2 uses the block and page address from ERASE1 */
+	case NAND_CMD_ERASE2:
+		vdbg("fsl_elbc_cmdfunc: NAND_CMD_ERASE2.\n");
+
+		out_be32(&lbc->fir,
+		         (FIR_OP_CW0 << FIR_OP0_SHIFT) |
+		         (FIR_OP_PA  << FIR_OP1_SHIFT) |
+		         (FIR_OP_CM1 << FIR_OP2_SHIFT));
+
+		out_be32(&lbc->fcr,
+		         (NAND_CMD_ERASE1 << FCR_CMD0_SHIFT) |
+		         (NAND_CMD_ERASE2 << FCR_CMD1_SHIFT));
+
+		out_be32(&lbc->fbcr, 0);
+		ctrl->read_bytes = 0;
+
+		fsl_elbc_run_command(mtd);
+		return;
+
+	/* SEQIN sets up the addr buffer and all registers except the length */
+	case NAND_CMD_SEQIN: {
+		u32 fcr;
+		vdbg("fsl_elbc_cmdfunc: NAND_CMD_SEQIN/PAGE_PROG, "
+		     "page_addr: 0x%x, column: 0x%x.\n",
+		     page_addr, column);
+
+		ctrl->column = column;
+		ctrl->oob = 0;
+
+		if (priv->page_size) {
+			fcr = (NAND_CMD_SEQIN << FCR_CMD0_SHIFT) |
+			      (NAND_CMD_PAGEPROG << FCR_CMD1_SHIFT);
+
+			out_be32(&lbc->fir,
+			         (FIR_OP_CW0 << FIR_OP0_SHIFT) |
+			         (FIR_OP_CA  << FIR_OP1_SHIFT) |
+			         (FIR_OP_PA  << FIR_OP2_SHIFT) |
+			         (FIR_OP_WB  << FIR_OP3_SHIFT) |
+			         (FIR_OP_CW1 << FIR_OP4_SHIFT));
+		} else {
+			fcr = (NAND_CMD_PAGEPROG << FCR_CMD1_SHIFT) |
+			      (NAND_CMD_SEQIN << FCR_CMD2_SHIFT);
+
+			out_be32(&lbc->fir,
+			         (FIR_OP_CW0 << FIR_OP0_SHIFT) |
+			         (FIR_OP_CM2 << FIR_OP1_SHIFT) |
+			         (FIR_OP_CA  << FIR_OP2_SHIFT) |
+			         (FIR_OP_PA  << FIR_OP3_SHIFT) |
+			         (FIR_OP_WB  << FIR_OP4_SHIFT) |
+			         (FIR_OP_CW1 << FIR_OP5_SHIFT));
+
+			if (column >= mtd->writesize) {
+				/* OOB area --> READOOB */
+				column -= mtd->writesize;
+				fcr |= NAND_CMD_READOOB << FCR_CMD0_SHIFT;
+				ctrl->oob = 1;
+			} else if (column < 256) {
+				/* First 256 bytes --> READ0 */
+				fcr |= NAND_CMD_READ0 << FCR_CMD0_SHIFT;
+			} else {
+				/* Second 256 bytes --> READ1 */
+				fcr |= NAND_CMD_READ1 << FCR_CMD0_SHIFT;
+			}
+		}
+
+		out_be32(&lbc->fcr, fcr);
+		set_addr(mtd, column, page_addr, ctrl->oob);
+		return;
+	}
+
+	/* PAGEPROG reuses all of the setup from SEQIN and adds the length */
+	case NAND_CMD_PAGEPROG: {
+		int full_page;
+		vdbg("fsl_elbc_cmdfunc: NAND_CMD_PAGEPROG "
+		     "writing %d bytes.\n", ctrl->index);
+
+		/* if the write did not start at 0 or is not a full page
+		 * then set the exact length, otherwise use a full page
+		 * write so the HW generates the ECC.
+		 */
+		if (ctrl->oob || ctrl->column != 0 ||
+		    ctrl->index != mtd->writesize + mtd->oobsize) {
+			out_be32(&lbc->fbcr, ctrl->index);
+			full_page = 0;
+		} else {
+			out_be32(&lbc->fbcr, 0);
+			full_page = 1;
+		}
+
+		fsl_elbc_run_command(mtd);
+
+		/* Read back the page in order to fill in the ECC for the
+		 * caller.  Is this really needed?
+		 */
+		if (full_page && ctrl->oob_poi) {
+			out_be32(&lbc->fbcr, 3);
+			set_addr(mtd, 6, page_addr, 1);
+
+			ctrl->read_bytes = mtd->writesize + 9;
+
+			fsl_elbc_do_read(chip, 1);
+			fsl_elbc_run_command(mtd);
+
+			memcpy_fromio(ctrl->oob_poi + 6,
+			              &ctrl->addr[ctrl->index], 3);
+			ctrl->index += 3;
+		}
+
+		ctrl->oob_poi = NULL;
+		return;
+	}
+
+	/* CMD_STATUS must read the status byte while CEB is active */
+	/* Note - it does not wait for the ready line */
+	case NAND_CMD_STATUS:
+		out_be32(&lbc->fir,
+		         (FIR_OP_CM0 << FIR_OP0_SHIFT) |
+		         (FIR_OP_RBW << FIR_OP1_SHIFT));
+		out_be32(&lbc->fcr, NAND_CMD_STATUS << FCR_CMD0_SHIFT);
+		out_be32(&lbc->fbcr, 1);
+		set_addr(mtd, 0, 0, 0);
+		ctrl->read_bytes = 1;
+
+		fsl_elbc_run_command(mtd);
+
+		/* The chip always seems to report that it is
+		 * write-protected, even when it is not.
+		 */
+		out_8(ctrl->addr, in_8(ctrl->addr) | NAND_STATUS_WP);
+		return;
+
+	/* RESET without waiting for the ready line */
+	case NAND_CMD_RESET:
+		dbg("fsl_elbc_cmdfunc: NAND_CMD_RESET.\n");
+		out_be32(&lbc->fir, FIR_OP_CM0 << FIR_OP0_SHIFT);
+		out_be32(&lbc->fcr, NAND_CMD_RESET << FCR_CMD0_SHIFT);
+		fsl_elbc_run_command(mtd);
+		return;
+
+	default:
+		printf("fsl_elbc_cmdfunc: error, unsupported command 0x%x.\n",
+		        command);
+	}
+}
+
+static void fsl_elbc_select_chip(struct mtd_info *mtd, int chip)
+{
+	/* The hardware does not seem to support multiple
+	 * chips per bank.
+	 */
+}
+
+/*
+ * Write buf to the FCM Controller Data Buffer
+ */
+static void fsl_elbc_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
+{
+	struct nand_chip *chip = mtd->priv;
+	struct fsl_elbc_mtd *priv = chip->priv;
+	struct fsl_elbc_ctrl *ctrl = priv->ctrl;
+	unsigned int bufsize = mtd->writesize + mtd->oobsize;
+
+	if (len <= 0) {
+		printf("write_buf of %d bytes", len);
+		ctrl->status = 0;
+		return;
+	}
+
+	if ((unsigned int)len > bufsize - ctrl->index) {
+		printf("write_buf beyond end of buffer "
+		       "(%d requested, %u available)\n",
+		       len, bufsize - ctrl->index);
+		len = bufsize - ctrl->index;
+	}
+
+	memcpy_toio(&ctrl->addr[ctrl->index], buf, len);
+	/*
+	 * This is workaround for the weird elbc hangs during nand write,
+	 * Scott Wood says: "...perhaps difference in how long it takes a
+	 * write to make it through the localbus compared to a write to IMMR
+	 * is causing problems, and sync isn't helping for some reason."
+	 * Reading back the last byte helps though.
+	 */
+	in_8(&ctrl->addr[ctrl->index] + len - 1);
+
+	ctrl->index += len;
+}
+
+/*
+ * read a byte from either the FCM hardware buffer if it has any data left
+ * otherwise issue a command to read a single byte.
+ */
+static u8 fsl_elbc_read_byte(struct mtd_info *mtd)
+{
+	struct nand_chip *chip = mtd->priv;
+	struct fsl_elbc_mtd *priv = chip->priv;
+	struct fsl_elbc_ctrl *ctrl = priv->ctrl;
+
+	/* If there are still bytes in the FCM, then use the next byte. */
+	if (ctrl->index < ctrl->read_bytes)
+		return in_8(&ctrl->addr[ctrl->index++]);
+
+	printf("read_byte beyond end of buffer\n");
+	return ERR_BYTE;
+}
+
+/*
+ * Read from the FCM Controller Data Buffer
+ */
+static void fsl_elbc_read_buf(struct mtd_info *mtd, u8 *buf, int len)
+{
+	struct nand_chip *chip = mtd->priv;
+	struct fsl_elbc_mtd *priv = chip->priv;
+	struct fsl_elbc_ctrl *ctrl = priv->ctrl;
+	int avail;
+
+	if (len < 0)
+		return;
+
+	avail = min((unsigned int)len, ctrl->read_bytes - ctrl->index);
+	memcpy_fromio(buf, &ctrl->addr[ctrl->index], avail);
+	ctrl->index += avail;
+
+	if (len > avail)
+		printf("read_buf beyond end of buffer "
+		       "(%d requested, %d available)\n",
+		       len, avail);
+}
+
+/*
+ * Verify buffer against the FCM Controller Data Buffer
+ */
+static int fsl_elbc_verify_buf(struct mtd_info *mtd,
+                               const u_char *buf, int len)
+{
+	struct nand_chip *chip = mtd->priv;
+	struct fsl_elbc_mtd *priv = chip->priv;
+	struct fsl_elbc_ctrl *ctrl = priv->ctrl;
+	int i;
+
+	if (len < 0) {
+		printf("write_buf of %d bytes", len);
+		return -EINVAL;
+	}
+
+	if ((unsigned int)len > ctrl->read_bytes - ctrl->index) {
+		printf("verify_buf beyond end of buffer "
+		       "(%d requested, %u available)\n",
+		       len, ctrl->read_bytes - ctrl->index);
+
+		ctrl->index = ctrl->read_bytes;
+		return -EINVAL;
+	}
+
+	for (i = 0; i < len; i++)
+		if (in_8(&ctrl->addr[ctrl->index + i]) != buf[i])
+			break;
+
+	ctrl->index += len;
+	return i == len && ctrl->status == LTESR_CC ? 0 : -EIO;
+}
+
+/* This function is called after Program and Erase Operations to
+ * check for success or failure.
+ */
+static int fsl_elbc_wait(struct mtd_info *mtd, struct nand_chip *chip)
+{
+	struct fsl_elbc_mtd *priv = chip->priv;
+	struct fsl_elbc_ctrl *ctrl = priv->ctrl;
+	lbus83xx_t *lbc = ctrl->regs;
+
+	if (ctrl->status != LTESR_CC)
+		return NAND_STATUS_FAIL;
+
+	/* Use READ_STATUS command, but wait for the device to be ready */
+	ctrl->use_mdr = 0;
+	out_be32(&lbc->fir,
+	         (FIR_OP_CW0 << FIR_OP0_SHIFT) |
+	         (FIR_OP_RBW << FIR_OP1_SHIFT));
+	out_be32(&lbc->fcr, NAND_CMD_STATUS << FCR_CMD0_SHIFT);
+	out_be32(&lbc->fbcr, 1);
+	set_addr(mtd, 0, 0, 0);
+	ctrl->read_bytes = 1;
+
+	fsl_elbc_run_command(mtd);
+
+	if (ctrl->status != LTESR_CC)
+		return NAND_STATUS_FAIL;
+
+	/* The chip always seems to report that it is
+	 * write-protected, even when it is not.
+	 */
+	out_8(ctrl->addr, in_8(ctrl->addr) | NAND_STATUS_WP);
+	return fsl_elbc_read_byte(mtd);
+}
+
+static int fsl_elbc_read_page(struct mtd_info *mtd,
+                              struct nand_chip *chip,
+                              uint8_t *buf)
+{
+	fsl_elbc_read_buf(mtd, buf, mtd->writesize);
+	fsl_elbc_read_buf(mtd, chip->oob_poi, mtd->oobsize);
+
+	if (fsl_elbc_wait(mtd, chip) & NAND_STATUS_FAIL)
+		mtd->ecc_stats.failed++;
+
+	return 0;
+}
+
+/* ECC will be calculated automatically, and errors will be detected in
+ * waitfunc.
+ */
+static void fsl_elbc_write_page(struct mtd_info *mtd,
+                                struct nand_chip *chip,
+                                const uint8_t *buf)
+{
+	struct fsl_elbc_mtd *priv = chip->priv;
+	struct fsl_elbc_ctrl *ctrl = priv->ctrl;
+
+	fsl_elbc_write_buf(mtd, buf, mtd->writesize);
+	fsl_elbc_write_buf(mtd, chip->oob_poi, mtd->oobsize);
+
+	ctrl->oob_poi = chip->oob_poi;
+}
+
+static struct fsl_elbc_ctrl *elbc_ctrl;
+
+static void fsl_elbc_ctrl_init(void)
+{
+	immap_t *im = (immap_t *)CFG_IMMR;
+
+	elbc_ctrl = kzalloc(sizeof(*elbc_ctrl), GFP_KERNEL);
+	if (!elbc_ctrl)
+		return;
+
+	elbc_ctrl->regs = &im->lbus;
+
+	/* clear event registers */
+	out_be32(&elbc_ctrl->regs->ltesr, LTESR_NAND_MASK);
+	out_be32(&elbc_ctrl->regs->lteatr, 0);
+
+	/* Enable interrupts for any detected events */
+	out_be32(&elbc_ctrl->regs->lteir, LTESR_NAND_MASK);
+
+	elbc_ctrl->read_bytes = 0;
+	elbc_ctrl->index = 0;
+	elbc_ctrl->addr = NULL;
+}
+
+int board_nand_init(struct nand_chip *nand)
+{
+	struct fsl_elbc_mtd *priv;
+	uint32_t br, or;
+
+	if (!elbc_ctrl) {
+		fsl_elbc_ctrl_init();
+		if (!elbc_ctrl)
+			return -1;
+	}
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	priv->ctrl = elbc_ctrl;
+	priv->vbase = nand->IO_ADDR_R;
+
+	/* Find which chip select it is connected to.  It'd be nice
+	 * if we could pass more than one datum to the NAND driver...
+	 */
+	for (priv->bank = 0; priv->bank < MAX_BANKS; priv->bank++) {
+		br = in_be32(&elbc_ctrl->regs->bank[priv->bank].br);
+		or = in_be32(&elbc_ctrl->regs->bank[priv->bank].or);
+
+		if ((br & BR_V) && (br & BR_MSEL) == BR_MS_FCM &&
+		    (br & or & BR_BA) == (phys_addr_t)nand->IO_ADDR_R)
+			break;
+	}
+
+	if (priv->bank >= MAX_BANKS) {
+		printf("fsl_elbc_nand: address did not match any "
+		       "chip selects\n");
+		return -ENODEV;
+	}
+
+	elbc_ctrl->chips[priv->bank] = priv;
+
+	/* fill in nand_chip structure */
+	/* set up function call table */
+	nand->read_byte = fsl_elbc_read_byte;
+	nand->write_buf = fsl_elbc_write_buf;
+	nand->read_buf = fsl_elbc_read_buf;
+	nand->verify_buf = fsl_elbc_verify_buf;
+	nand->select_chip = fsl_elbc_select_chip;
+	nand->cmdfunc = fsl_elbc_cmdfunc;
+	nand->waitfunc = fsl_elbc_wait;
+
+	/* set up nand options */
+	nand->options = NAND_NO_READRDY | NAND_NO_AUTOINCR;
+
+	nand->controller = &elbc_ctrl->controller;
+	nand->priv = priv;
+
+	nand->ecc.read_page = fsl_elbc_read_page;
+	nand->ecc.write_page = fsl_elbc_write_page;
+
+	/* If CS Base Register selects full hardware ECC then use it */
+	if ((br & BR_DECC) == BR_DECC_CHK_GEN) {
+		nand->ecc.mode = NAND_ECC_HW;
+
+		nand->ecc.layout = (priv->fmr & FMR_ECCM) ?
+		                   &fsl_elbc_oob_sp_eccm1 :
+		                   &fsl_elbc_oob_sp_eccm0;
+
+		nand->ecc.size = 512;
+		nand->ecc.bytes = 3;
+		nand->ecc.steps = 1;
+	} else {
+		/* otherwise fall back to default software ECC */
+		nand->ecc.mode = NAND_ECC_SOFT;
+	}
+
+	priv->fmr = (15 << FMR_CWTO_SHIFT) | (2 << FMR_AL_SHIFT);
+
+	/* adjust Option Register and ECC to match Flash page size */
+	if (or & OR_FCM_PGS) {
+		priv->page_size = 1;
+
+		/* adjust ecc setup if needed */
+		if ((br & BR_DECC) == BR_DECC_CHK_GEN) {
+			nand->ecc.steps = 4;
+			nand->ecc.layout = (priv->fmr & FMR_ECCM) ?
+			                   &fsl_elbc_oob_lp_eccm1 :
+			                   &fsl_elbc_oob_lp_eccm0;
+		}
+	}
+
+	return 0;
+}

drivers/mtd/nand/fsl_upm.c

@@ -20,8 +20,6 @@
 #include <linux/mtd/fsl_upm.h>
 #include <nand.h>
 
-static int fsl_upm_in_pattern;
-
 static void fsl_upm_start_pattern(struct fsl_upm *upm, u32 pat_offset)
 {
 	clrsetbits_be32(upm->mxmr, MxMR_MAD_MSK, MxMR_OP_RUNP | pat_offset);
@@ -51,49 +49,38 @@ static void fsl_upm_run_pattern(struct fsl_upm *upm, int width, u32 cmd)
 	}
 }
 
-static void nand_hwcontrol (struct mtd_info *mtd, int cmd)
+static void fun_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
 {
 	struct nand_chip *chip = mtd->priv;
 	struct fsl_upm_nand *fun = chip->priv;
 
-	switch (cmd) {
-	case NAND_CTL_SETCLE:
-		fsl_upm_start_pattern(&fun->upm, fun->upm_cmd_offset);
-		fsl_upm_in_pattern++;
-		break;
-	case NAND_CTL_SETALE:
-		fsl_upm_start_pattern(&fun->upm, fun->upm_addr_offset);
-		fsl_upm_in_pattern++;
-		break;
-	case NAND_CTL_CLRCLE:
-	case NAND_CTL_CLRALE:
+	if (!(ctrl & fun->last_ctrl)) {
 		fsl_upm_end_pattern(&fun->upm);
-		fsl_upm_in_pattern--;
-		break;
+
+		if (cmd == NAND_CMD_NONE)
+			return;
+
+		fun->last_ctrl = ctrl & (NAND_ALE | NAND_CLE);
 	}
-}
 
-static void nand_write_byte(struct mtd_info *mtd, u_char byte)
-{
-	struct nand_chip *chip = mtd->priv;
+	if (ctrl & NAND_CTRL_CHANGE) {
+		if (ctrl & NAND_ALE)
+			fsl_upm_start_pattern(&fun->upm, fun->upm_addr_offset);
+		else if (ctrl & NAND_CLE)
+			fsl_upm_start_pattern(&fun->upm, fun->upm_cmd_offset);
+	}
 
-	if (fsl_upm_in_pattern) {
-		struct fsl_upm_nand *fun = chip->priv;
-
-		fsl_upm_run_pattern(&fun->upm, fun->width, byte);
-
-		/*
-		 * Some boards/chips needs this. At least on MPC8360E-RDK we
-		 * need it. Probably weird chip, because I don't see any need
-		 * for this on MPC8555E + Samsung K9F1G08U0A. Usually here are
-		 * 0-2 unexpected busy states per block read.
-		 */
-		if (fun->wait_pattern) {
-			while (!fun->dev_ready())
-				debug("unexpected busy state\n");
-		}
-	} else {
-		out_8(chip->IO_ADDR_W, byte);
+	fsl_upm_run_pattern(&fun->upm, fun->width, cmd);
+
+	/*
+	 * Some boards/chips needs this. At least on MPC8360E-RDK we
+	 * need it. Probably weird chip, because I don't see any need
+	 * for this on MPC8555E + Samsung K9F1G08U0A. Usually here are
+	 * 0-2 unexpected busy states per block read.
+	 */
+	if (fun->wait_pattern) {
+		while (!fun->dev_ready())
+			debug("unexpected busy state\n");
 	}
 }
 
@@ -148,13 +135,14 @@ int fsl_upm_nand_init(struct nand_chip *chip, struct fsl_upm_nand *fun)
 	if (fun->width != 8 && fun->width != 16 && fun->width != 32)
 		return -ENOSYS;
 
+	fun->last_ctrl = NAND_CLE;
+
 	chip->priv = fun;
 	chip->chip_delay = fun->chip_delay;
-	chip->eccmode = NAND_ECC_SOFT;
-	chip->hwcontrol = nand_hwcontrol;
+	chip->ecc.mode = NAND_ECC_SOFT;
+	chip->cmd_ctrl = fun_cmd_ctrl;
 	chip->read_byte = nand_read_byte;
 	chip->read_buf = nand_read_buf;
-	chip->write_byte = nand_write_byte;
 	chip->write_buf = nand_write_buf;
 	chip->verify_buf = nand_verify_buf;
 	if (fun->dev_ready)

drivers/mtd/nand/nand_ecc.c

@@ -7,7 +7,9 @@
  * Copyright (C) 2000-2004 Steven J. Hill (sjhill@realitydiluted.com)
  *                         Toshiba America Electronics Components, Inc.
  *
- * $Id: nand_ecc.c,v 1.14 2004/06/16 15:34:37 gleixner Exp $
+ * Copyright (C) 2006 Thomas Gleixner <tglx@linutronix.de>
+ *
+ * $Id: nand_ecc.c,v 1.15 2005/11/07 11:14:30 gleixner Exp $
  *
  * This file is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
@@ -39,6 +41,14 @@
 
 #if defined(CONFIG_CMD_NAND) && !defined(CFG_NAND_LEGACY)
 
+/* XXX U-BOOT XXX */
+#if 0
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mtd/nand_ecc.h>
+#endif
+
 #include<linux/mtd/mtd.h>
 
 /*
@@ -128,6 +138,10 @@ int nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat,
 
 	return 0;
 }
+/* XXX U-BOOT XXX */
+#if 0
+EXPORT_SYMBOL(nand_calculate_ecc);
+#endif
 #endif /* CONFIG_NAND_SPL */
 
 static inline int countbits(uint32_t byte)
@@ -197,4 +211,9 @@ int nand_correct_data(struct mtd_info *mtd, u_char *dat,
 	return -1;
 }
 
+/* XXX U-BOOT XXX */
+#if 0
+EXPORT_SYMBOL(nand_correct_data);
+#endif
+
 #endif

drivers/mtd/nand/nand_ids.c

@@ -2,8 +2,8 @@
  *  drivers/mtd/nandids.c
  *
  *  Copyright (C) 2002 Thomas Gleixner (tglx@linutronix.de)
-  *
- * $Id: nand_ids.c,v 1.10 2004/05/26 13:40:12 gleixner Exp $
+ *
+ * $Id: nand_ids.c,v 1.16 2005/11/07 11:14:31 gleixner Exp $
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
@@ -16,7 +16,6 @@
 #if defined(CONFIG_CMD_NAND) && !defined(CFG_NAND_LEGACY)
 
 #include <linux/mtd/nand.h>
-
 /*
 *	Chip ID list
 *
@@ -29,13 +28,15 @@
 *	512	512 Byte page size
 */
 struct nand_flash_dev nand_flash_ids[] = {
+
+#ifdef CONFIG_MTD_NAND_MUSEUM_IDS
 	{"NAND 1MiB 5V 8-bit",		0x6e, 256, 1, 0x1000, 0},
 	{"NAND 2MiB 5V 8-bit",		0x64, 256, 2, 0x1000, 0},
 	{"NAND 4MiB 5V 8-bit",		0x6b, 512, 4, 0x2000, 0},
 	{"NAND 1MiB 3,3V 8-bit",	0xe8, 256, 1, 0x1000, 0},
 	{"NAND 1MiB 3,3V 8-bit",	0xec, 256, 1, 0x1000, 0},
 	{"NAND 2MiB 3,3V 8-bit",	0xea, 256, 2, 0x1000, 0},
-	{"NAND 4MiB 3,3V 8-bit",	0xd5, 512, 4, 0x2000, 0},
+	{"NAND 4MiB 3,3V 8-bit", 	0xd5, 512, 4, 0x2000, 0},
 	{"NAND 4MiB 3,3V 8-bit",	0xe3, 512, 4, 0x2000, 0},
 	{"NAND 4MiB 3,3V 8-bit",	0xe5, 512, 4, 0x2000, 0},
 	{"NAND 8MiB 3,3V 8-bit",	0xd6, 512, 8, 0x2000, 0},
@@ -44,6 +45,7 @@ struct nand_flash_dev nand_flash_ids[] = {
 	{"NAND 8MiB 3,3V 8-bit",	0xe6, 512, 8, 0x2000, 0},
 	{"NAND 8MiB 1,8V 16-bit",	0x49, 512, 8, 0x2000, NAND_BUSWIDTH_16},
 	{"NAND 8MiB 3,3V 16-bit",	0x59, 512, 8, 0x2000, NAND_BUSWIDTH_16},
+#endif
 
 	{"NAND 16MiB 1,8V 8-bit",	0x33, 512, 16, 0x4000, 0},
 	{"NAND 16MiB 3,3V 8-bit",	0x73, 512, 16, 0x4000, 0},
@@ -61,52 +63,72 @@ struct nand_flash_dev nand_flash_ids[] = {
 	{"NAND 64MiB 3,3V 16-bit",	0x56, 512, 64, 0x4000, NAND_BUSWIDTH_16},
 
 	{"NAND 128MiB 1,8V 8-bit",	0x78, 512, 128, 0x4000, 0},
+	{"NAND 128MiB 1,8V 8-bit",	0x39, 512, 128, 0x4000, 0},
 	{"NAND 128MiB 3,3V 8-bit",	0x79, 512, 128, 0x4000, 0},
 	{"NAND 128MiB 1,8V 16-bit",	0x72, 512, 128, 0x4000, NAND_BUSWIDTH_16},
+	{"NAND 128MiB 1,8V 16-bit",	0x49, 512, 128, 0x4000, NAND_BUSWIDTH_16},
 	{"NAND 128MiB 3,3V 16-bit",	0x74, 512, 128, 0x4000, NAND_BUSWIDTH_16},
+	{"NAND 128MiB 3,3V 16-bit",	0x59, 512, 128, 0x4000, NAND_BUSWIDTH_16},
 
 	{"NAND 256MiB 3,3V 8-bit",	0x71, 512, 256, 0x4000, 0},
 
-	/* These are the new chips with large page size. The pagesize
-	* and the erasesize is determined from the extended id bytes
-	*/
+	/*
+	 * These are the new chips with large page size. The pagesize and the
+	 * erasesize is determined from the extended id bytes
+	 */
+#define LP_OPTIONS (NAND_SAMSUNG_LP_OPTIONS | NAND_NO_READRDY | NAND_NO_AUTOINCR)
+#define LP_OPTIONS16 (LP_OPTIONS | NAND_BUSWIDTH_16)
+
+	/*512 Megabit */
+	{"NAND 64MiB 1,8V 8-bit",	0xA2, 0,  64, 0, LP_OPTIONS},
+	{"NAND 64MiB 3,3V 8-bit",	0xF2, 0,  64, 0, LP_OPTIONS},
+	{"NAND 64MiB 1,8V 16-bit",	0xB2, 0,  64, 0, LP_OPTIONS16},
+	{"NAND 64MiB 3,3V 16-bit",	0xC2, 0,  64, 0, LP_OPTIONS16},
+
 	/* 1 Gigabit */
-	{"NAND 128MiB 1,8V 8-bit",	0xA1, 0, 128, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_NO_AUTOINCR},
-	{"NAND 128MiB 3,3V 8-bit",	0xF1, 0, 128, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_NO_AUTOINCR},
-	{"NAND 128MiB 1,8V 16-bit",	0xB1, 0, 128, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_BUSWIDTH_16 | NAND_NO_AUTOINCR},
-	{"NAND 128MiB 3,3V 16-bit",	0xC1, 0, 128, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_BUSWIDTH_16 | NAND_NO_AUTOINCR},
+	{"NAND 128MiB 1,8V 8-bit",	0xA1, 0, 128, 0, LP_OPTIONS},
+	{"NAND 128MiB 3,3V 8-bit",	0xF1, 0, 128, 0, LP_OPTIONS},
+	{"NAND 128MiB 1,8V 16-bit",	0xB1, 0, 128, 0, LP_OPTIONS16},
+	{"NAND 128MiB 3,3V 16-bit",	0xC1, 0, 128, 0, LP_OPTIONS16},
 
 	/* 2 Gigabit */
-	{"NAND 256MiB 1,8V 8-bit",	0xAA, 0, 256, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_NO_AUTOINCR},
-	{"NAND 256MiB 3,3V 8-bit",	0xDA, 0, 256, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_NO_AUTOINCR},
-	{"NAND 256MiB 1,8V 16-bit",	0xBA, 0, 256, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_BUSWIDTH_16 | NAND_NO_AUTOINCR},
-	{"NAND 256MiB 3,3V 16-bit",	0xCA, 0, 256, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_BUSWIDTH_16 | NAND_NO_AUTOINCR},
+	{"NAND 256MiB 1,8V 8-bit",	0xAA, 0, 256, 0, LP_OPTIONS},
+	{"NAND 256MiB 3,3V 8-bit",	0xDA, 0, 256, 0, LP_OPTIONS},
+	{"NAND 256MiB 1,8V 16-bit",	0xBA, 0, 256, 0, LP_OPTIONS16},
+	{"NAND 256MiB 3,3V 16-bit",	0xCA, 0, 256, 0, LP_OPTIONS16},
 
 	/* 4 Gigabit */
-	{"NAND 512MiB 1,8V 8-bit",	0xAC, 0, 512, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_NO_AUTOINCR},
-	{"NAND 512MiB 3,3V 8-bit",	0xDC, 0, 512, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_NO_AUTOINCR},
-	{"NAND 512MiB 1,8V 16-bit",	0xBC, 0, 512, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_BUSWIDTH_16 | NAND_NO_AUTOINCR},
-	{"NAND 512MiB 3,3V 16-bit",	0xCC, 0, 512, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_BUSWIDTH_16 | NAND_NO_AUTOINCR},
+	{"NAND 512MiB 1,8V 8-bit",	0xAC, 0, 512, 0, LP_OPTIONS},
+	{"NAND 512MiB 3,3V 8-bit",	0xDC, 0, 512, 0, LP_OPTIONS},
+	{"NAND 512MiB 1,8V 16-bit",	0xBC, 0, 512, 0, LP_OPTIONS16},
+	{"NAND 512MiB 3,3V 16-bit",	0xCC, 0, 512, 0, LP_OPTIONS16},
 
 	/* 8 Gigabit */
-	{"NAND 1GiB 1,8V 8-bit",	0xA3, 0, 1024, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_NO_AUTOINCR},
-	{"NAND 1GiB 3,3V 8-bit",	0xD3, 0, 1024, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_NO_AUTOINCR},
-	{"NAND 1GiB 1,8V 16-bit",	0xB3, 0, 1024, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_BUSWIDTH_16 | NAND_NO_AUTOINCR},
-	{"NAND 1GiB 3,3V 16-bit",	0xC3, 0, 1024, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_BUSWIDTH_16 | NAND_NO_AUTOINCR},
+	{"NAND 1GiB 1,8V 8-bit",	0xA3, 0, 1024, 0, LP_OPTIONS},
+	{"NAND 1GiB 3,3V 8-bit",	0xD3, 0, 1024, 0, LP_OPTIONS},
+	{"NAND 1GiB 1,8V 16-bit",	0xB3, 0, 1024, 0, LP_OPTIONS16},
+	{"NAND 1GiB 3,3V 16-bit",	0xC3, 0, 1024, 0, LP_OPTIONS16},
 
 	/* 16 Gigabit */
-	{"NAND 2GiB 1,8V 8-bit",	0xA5, 0, 2048, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_NO_AUTOINCR},
-	{"NAND 2GiB 3,3V 8-bit",	0xD5, 0, 2048, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_NO_AUTOINCR},
-	{"NAND 2GiB 1,8V 16-bit",	0xB5, 0, 2048, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_BUSWIDTH_16 | NAND_NO_AUTOINCR},
-	{"NAND 2GiB 3,3V 16-bit",	0xC5, 0, 2048, 0, NAND_SAMSUNG_LP_OPTIONS | NAND_BUSWIDTH_16 | NAND_NO_AUTOINCR},
-
-	/* Renesas AND 1 Gigabit. Those chips do not support extended id and have a strange page/block layout !
-	 * The chosen minimum erasesize is 4 * 2 * 2048 = 16384 Byte, as those chips have an array of 4 page planes
-	 * 1 block = 2 pages, but due to plane arrangement the blocks 0-3 consists of page 0 + 4,1 + 5, 2 + 6, 3 + 7
-	 * Anyway JFFS2 would increase the eraseblock size so we chose a combined one which can be erased in one go
-	 * There are more speed improvements for reads and writes possible, but not implemented now
+	{"NAND 2GiB 1,8V 8-bit",	0xA5, 0, 2048, 0, LP_OPTIONS},
+	{"NAND 2GiB 3,3V 8-bit",	0xD5, 0, 2048, 0, LP_OPTIONS},
+	{"NAND 2GiB 1,8V 16-bit",	0xB5, 0, 2048, 0, LP_OPTIONS16},
+	{"NAND 2GiB 3,3V 16-bit",	0xC5, 0, 2048, 0, LP_OPTIONS16},
+
+	/*
+	 * Renesas AND 1 Gigabit. Those chips do not support extended id and
+	 * have a strange page/block layout !  The chosen minimum erasesize is
+	 * 4 * 2 * 2048 = 16384 Byte, as those chips have an array of 4 page
+	 * planes 1 block = 2 pages, but due to plane arrangement the blocks
+	 * 0-3 consists of page 0 + 4,1 + 5, 2 + 6, 3 + 7 Anyway JFFS2 would
+	 * increase the eraseblock size so we chose a combined one which can be
+	 * erased in one go There are more speed improvements for reads and
+	 * writes possible, but not implemented now
 	 */
-	{"AND 128MiB 3,3V 8-bit",	0x01, 2048, 128, 0x4000, NAND_IS_AND | NAND_NO_AUTOINCR | NAND_4PAGE_ARRAY},
+	{"AND 128MiB 3,3V 8-bit",	0x01, 2048, 128, 0x4000,
+	 NAND_IS_AND | NAND_NO_AUTOINCR |NAND_NO_READRDY | NAND_4PAGE_ARRAY |
+	 BBT_AUTO_REFRESH
+	},
 
 	{NULL,}
 };
@@ -121,6 +143,7 @@ struct nand_manufacturers nand_manuf_ids[] = {
 	{NAND_MFR_NATIONAL, "National"},
 	{NAND_MFR_RENESAS, "Renesas"},
 	{NAND_MFR_STMICRO, "ST Micro"},
+	{NAND_MFR_HYNIX, "Hynix"},
 	{NAND_MFR_MICRON, "Micron"},
 	{0x0, "Unknown"}
 };

drivers/mtd/nand/nand_util.c

@@ -39,6 +39,9 @@
 #include <malloc.h>
 #include <div64.h>
 
+
+#include <asm/errno.h>
+#include <linux/mtd/mtd.h>
 #include <nand.h>
 #include <jffs2/jffs2.h>
 
@@ -69,71 +72,33 @@ static int nand_block_bad_scrub(struct mtd_info *mtd, loff_t ofs, int getchip)
 int nand_erase_opts(nand_info_t *meminfo, const nand_erase_options_t *opts)
 {
 	struct jffs2_unknown_node cleanmarker;
-	int clmpos = 0;
-	int clmlen = 8;
 	erase_info_t erase;
 	ulong erase_length;
-	int isNAND;
 	int bbtest = 1;
 	int result;
 	int percent_complete = -1;
 	int (*nand_block_bad_old)(struct mtd_info *, loff_t, int) = NULL;
 	const char *mtd_device = meminfo->name;
+	struct mtd_oob_ops oob_opts;
+	struct nand_chip *chip = meminfo->priv;
+	uint8_t buf[64];
 
+	memset(buf, 0, sizeof(buf));
 	memset(&erase, 0, sizeof(erase));
+	memset(&oob_opts, 0, sizeof(oob_opts));
 
 	erase.mtd = meminfo;
 	erase.len  = meminfo->erasesize;
 	erase.addr = opts->offset;
 	erase_length = opts->length;
 
-	isNAND = meminfo->type == MTD_NANDFLASH ? 1 : 0;
-
-	if (opts->jffs2) {
-		cleanmarker.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK);
-		cleanmarker.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER);
-		if (isNAND) {
-			struct nand_oobinfo *oobinfo = &meminfo->oobinfo;
-
-			/* check for autoplacement */
-			if (oobinfo->useecc == MTD_NANDECC_AUTOPLACE) {
-				/* get the position of the free bytes */
-				if (!oobinfo->oobfree[0][1]) {
-					printf(" Eeep. Autoplacement selected "
-					       "and no empty space in oob\n");
-					return -1;
-				}
-				clmpos = oobinfo->oobfree[0][0];
-				clmlen = oobinfo->oobfree[0][1];
-				if (clmlen > 8)
-					clmlen = 8;
-			} else {
-				/* legacy mode */
-				switch (meminfo->oobsize) {
-				case 8:
-					clmpos = 6;
-					clmlen = 2;
-					break;
-				case 16:
-					clmpos = 8;
-					clmlen = 8;
-					break;
-				case 64:
-					clmpos = 16;
-					clmlen = 8;
-					break;
-				}
-			}
 
-			cleanmarker.totlen = cpu_to_je32(8);
-		} else {
-			cleanmarker.totlen =
-				cpu_to_je32(sizeof(struct jffs2_unknown_node));
-		}
-		cleanmarker.hdr_crc =  cpu_to_je32(
-			crc32_no_comp(0, (unsigned char *) &cleanmarker,
-				      sizeof(struct jffs2_unknown_node) - 4));
-	}
+	cleanmarker.magic = cpu_to_je16 (JFFS2_MAGIC_BITMASK);
+	cleanmarker.nodetype = cpu_to_je16 (JFFS2_NODETYPE_CLEANMARKER);
+	cleanmarker.totlen = cpu_to_je32(8);
+	cleanmarker.hdr_crc = cpu_to_je32(
+	crc32_no_comp(0, (unsigned char *) &cleanmarker,
+	sizeof(struct jffs2_unknown_node) - 4));
 
 	/* scrub option allows to erase badblock. To prevent internal
 	 * check from erase() method, set block check method to dummy
@@ -194,25 +159,21 @@ int nand_erase_opts(nand_info_t *meminfo, const nand_erase_options_t *opts)
 		/* format for JFFS2 ? */
 		if (opts->jffs2) {
 
-			/* write cleanmarker */
-			if (isNAND) {
-				size_t written;
-				result = meminfo->write_oob(meminfo,
-							    erase.addr + clmpos,
-							    clmlen,
-							    &written,
-							    (unsigned char *)
-							    &cleanmarker);
-				if (result != 0) {
-					printf("\n%s: MTD writeoob failure: %d\n",
-					       mtd_device, result);
-					continue;
-				}
-			} else {
-				printf("\n%s: this erase routine only supports"
-				       " NAND devices!\n",
-				       mtd_device);
+			chip->ops.len = chip->ops.ooblen = 64;
+			chip->ops.datbuf = NULL;
+			chip->ops.oobbuf = buf;
+			chip->ops.ooboffs = chip->badblockpos & ~0x01;
+
+			result = meminfo->write_oob(meminfo,
+							erase.addr + meminfo->oobsize,
+							&chip->ops);
+			if (result != 0) {
+				printf("\n%s: MTD writeoob failure: %d\n",
+				mtd_device, result);
+				continue;
 			}
+			else
+				printf("%s: MTD writeoob at 0x%08x\n",mtd_device, erase.addr + meminfo->oobsize );
 		}
 
 		if (!opts->quiet) {
@@ -232,11 +193,11 @@ int nand_erase_opts(nand_info_t *meminfo, const nand_erase_options_t *opts)
 				percent_complete = percent;
 
 				printf("\rErasing at 0x%x -- %3d%% complete.",
-				       erase.addr, percent);
+				erase.addr, percent);
 
 				if (opts->jffs2 && result == 0)
-					printf(" Cleanmarker written at 0x%x.",
-					       erase.addr);
+				printf(" Cleanmarker written at 0x%x.",
+				erase.addr);
 			}
 		}
 	}
@@ -253,6 +214,9 @@ int nand_erase_opts(nand_info_t *meminfo, const nand_erase_options_t *opts)
 	return 0;
 }
 
+/* XXX U-BOOT XXX */
+#if 0
+
 #define MAX_PAGE_SIZE	2048
 #define MAX_OOB_SIZE	64
 
@@ -263,443 +227,29 @@ static unsigned char data_buf[MAX_PAGE_SIZE];
 static unsigned char oob_buf[MAX_OOB_SIZE];
 
 /* OOB layouts to pass into the kernel as default */
-static struct nand_oobinfo none_oobinfo = {
+static struct nand_ecclayout none_ecclayout = {
 	.useecc = MTD_NANDECC_OFF,
 };
 
-static struct nand_oobinfo jffs2_oobinfo = {
+static struct nand_ecclayout jffs2_ecclayout = {
 	.useecc = MTD_NANDECC_PLACE,
 	.eccbytes = 6,
 	.eccpos = { 0, 1, 2, 3, 6, 7 }
 };
 
-static struct nand_oobinfo yaffs_oobinfo = {
+static struct nand_ecclayout yaffs_ecclayout = {
 	.useecc = MTD_NANDECC_PLACE,
 	.eccbytes = 6,
 	.eccpos = { 8, 9, 10, 13, 14, 15}
 };
 
-static struct nand_oobinfo autoplace_oobinfo = {
+static struct nand_ecclayout autoplace_ecclayout = {
 	.useecc = MTD_NANDECC_AUTOPLACE
 };
+#endif
 
-/**
- * nand_write_opts: - write image to NAND flash with support for various options
- *
- * @param meminfo	NAND device to erase
- * @param opts		write options (@see nand_write_options)
- * @return		0 in case of success
- *
- * This code is ported from nandwrite.c from Linux mtd utils by
- * Steven J. Hill and Thomas Gleixner.
- */
-int nand_write_opts(nand_info_t *meminfo, const nand_write_options_t *opts)
-{
-	int imglen = 0;
-	int pagelen;
-	int baderaseblock;
-	int blockstart = -1;
-	loff_t offs;
-	int readlen;
-	int oobinfochanged = 0;
-	int percent_complete = -1;
-	struct nand_oobinfo old_oobinfo;
-	ulong mtdoffset = opts->offset;
-	ulong erasesize_blockalign;
-	u_char *buffer = opts->buffer;
-	size_t written;
-	int result;
-
-	if (opts->pad && opts->writeoob) {
-		printf("Can't pad when oob data is present.\n");
-		return -1;
-	}
-
-	/* set erasesize to specified number of blocks - to match
-	 * jffs2 (virtual) block size */
-	if (opts->blockalign == 0) {
-		erasesize_blockalign = meminfo->erasesize;
-	} else {
-		erasesize_blockalign = meminfo->erasesize * opts->blockalign;
-	}
-
-	/* make sure device page sizes are valid */
-	if (!(meminfo->oobsize == 16 && meminfo->oobblock == 512)
-	    && !(meminfo->oobsize == 8 && meminfo->oobblock == 256)
-	    && !(meminfo->oobsize == 64 && meminfo->oobblock == 2048)) {
-		printf("Unknown flash (not normal NAND)\n");
-		return -1;
-	}
-
-	/* read the current oob info */
-	memcpy(&old_oobinfo, &meminfo->oobinfo, sizeof(old_oobinfo));
-
-	/* write without ecc? */
-	if (opts->noecc) {
-		memcpy(&meminfo->oobinfo, &none_oobinfo,
-		       sizeof(meminfo->oobinfo));
-		oobinfochanged = 1;
-	}
-
-	/* autoplace ECC? */
-	if (opts->autoplace && (old_oobinfo.useecc != MTD_NANDECC_AUTOPLACE)) {
-
-		memcpy(&meminfo->oobinfo, &autoplace_oobinfo,
-		       sizeof(meminfo->oobinfo));
-		oobinfochanged = 1;
-	}
-
-	/* force OOB layout for jffs2 or yaffs? */
-	if (opts->forcejffs2 || opts->forceyaffs) {
-		struct nand_oobinfo *oobsel =
-			opts->forcejffs2 ? &jffs2_oobinfo : &yaffs_oobinfo;
-
-		if (meminfo->oobsize == 8) {
-			if (opts->forceyaffs) {
-				printf("YAFSS cannot operate on "
-				       "256 Byte page size\n");
-				goto restoreoob;
-			}
-			/* Adjust number of ecc bytes */
-			jffs2_oobinfo.eccbytes = 3;
-		}
-
-		memcpy(&meminfo->oobinfo, oobsel, sizeof(meminfo->oobinfo));
-	}
-
-	/* get image length */
-	imglen = opts->length;
-	pagelen = meminfo->oobblock
-		+ ((opts->writeoob != 0) ? meminfo->oobsize : 0);
-
-	/* check, if file is pagealigned */
-	if ((!opts->pad) && ((imglen % pagelen) != 0)) {
-		printf("Input block length is not page aligned\n");
-		goto restoreoob;
-	}
-
-	/* check, if length fits into device */
-	if (((imglen / pagelen) * meminfo->oobblock)
-	     > (meminfo->size - opts->offset)) {
-		printf("Image %d bytes, NAND page %d bytes, "
-		       "OOB area %u bytes, device size %u bytes\n",
-		       imglen, pagelen, meminfo->oobblock, meminfo->size);
-		printf("Input block does not fit into device\n");
-		goto restoreoob;
-	}
-
-	if (!opts->quiet)
-		printf("\n");
-
-	/* get data from input and write to the device */
-	while (imglen && (mtdoffset < meminfo->size)) {
-
-		WATCHDOG_RESET ();
-
-		/*
-		 * new eraseblock, check for bad block(s). Stay in the
-		 * loop to be sure if the offset changes because of
-		 * a bad block, that the next block that will be
-		 * written to is also checked. Thus avoiding errors if
-		 * the block(s) after the skipped block(s) is also bad
-		 * (number of blocks depending on the blockalign
-		 */
-		while (blockstart != (mtdoffset & (~erasesize_blockalign+1))) {
-			blockstart = mtdoffset & (~erasesize_blockalign+1);
-			offs = blockstart;
-			baderaseblock = 0;
-
-			/* check all the blocks in an erase block for
-			 * bad blocks */
-			do {
-				int ret = meminfo->block_isbad(meminfo, offs);
-
-				if (ret < 0) {
-					printf("Bad block check failed\n");
-					goto restoreoob;
-				}
-				if (ret == 1) {
-					baderaseblock = 1;
-					if (!opts->quiet)
-						printf("\rBad block at 0x%lx "
-						       "in erase block from "
-						       "0x%x will be skipped\n",
-						       (long) offs,
-						       blockstart);
-				}
-
-				if (baderaseblock) {
-					mtdoffset = blockstart
-						+ erasesize_blockalign;
-				}
-				offs +=	 erasesize_blockalign
-					/ opts->blockalign;
-			} while (offs < blockstart + erasesize_blockalign);
-		}
-
-		readlen = meminfo->oobblock;
-		if (opts->pad && (imglen < readlen)) {
-			readlen = imglen;
-			memset(data_buf + readlen, 0xff,
-			       meminfo->oobblock - readlen);
-		}
-
-		/* read page data from input memory buffer */
-		memcpy(data_buf, buffer, readlen);
-		buffer += readlen;
-
-		if (opts->writeoob) {
-			/* read OOB data from input memory block, exit
-			 * on failure */
-			memcpy(oob_buf, buffer, meminfo->oobsize);
-			buffer += meminfo->oobsize;
-
-			/* write OOB data first, as ecc will be placed
-			 * in there*/
-			result = meminfo->write_oob(meminfo,
-						    mtdoffset,
-						    meminfo->oobsize,
-						    &written,
-						    (unsigned char *)
-						    &oob_buf);
-
-			if (result != 0) {
-				printf("\nMTD writeoob failure: %d\n",
-				       result);
-				goto restoreoob;
-			}
-			imglen -= meminfo->oobsize;
-		}
-
-		/* write out the page data */
-		result = meminfo->write(meminfo,
-					mtdoffset,
-					meminfo->oobblock,
-					&written,
-					(unsigned char *) &data_buf);
-
-		if (result != 0) {
-			printf("writing NAND page at offset 0x%lx failed\n",
-			       mtdoffset);
-			goto restoreoob;
-		}
-		imglen -= readlen;
-
-		if (!opts->quiet) {
-			unsigned long long n = (unsigned long long)
-				 (opts->length-imglen) * 100;
-			int percent;
-
-			do_div(n, opts->length);
-			percent = (int)n;
-
-			/* output progress message only at whole percent
-			 * steps to reduce the number of messages printed
-			 * on (slow) serial consoles
-			 */
-			if (percent != percent_complete) {
-				printf("\rWriting data at 0x%lx "
-				       "-- %3d%% complete.",
-				       mtdoffset, percent);
-				percent_complete = percent;
-			}
-		}
-
-		mtdoffset += meminfo->oobblock;
-	}
-
-	if (!opts->quiet)
-		printf("\n");
-
-restoreoob:
-	if (oobinfochanged) {
-		memcpy(&meminfo->oobinfo, &old_oobinfo,
-		       sizeof(meminfo->oobinfo));
-	}
-
-	if (imglen > 0) {
-		printf("Data did not fit into device, due to bad blocks\n");
-		return -1;
-	}
-
-	/* return happy */
-	return 0;
-}
-
-/**
- * nand_read_opts: - read image from NAND flash with support for various options
- *
- * @param meminfo	NAND device to erase
- * @param opts		read options (@see struct nand_read_options)
- * @return		0 in case of success
- *
- */
-int nand_read_opts(nand_info_t *meminfo, const nand_read_options_t *opts)
-{
-	int imglen = opts->length;
-	int pagelen;
-	int baderaseblock;
-	int blockstart = -1;
-	int percent_complete = -1;
-	loff_t offs;
-	size_t readlen;
-	ulong mtdoffset = opts->offset;
-	u_char *buffer = opts->buffer;
-	int result;
-
-	/* make sure device page sizes are valid */
-	if (!(meminfo->oobsize == 16 && meminfo->oobblock == 512)
-	    && !(meminfo->oobsize == 8 && meminfo->oobblock == 256)
-	    && !(meminfo->oobsize == 64 && meminfo->oobblock == 2048)) {
-		printf("Unknown flash (not normal NAND)\n");
-		return -1;
-	}
-
-	pagelen = meminfo->oobblock
-		+ ((opts->readoob != 0) ? meminfo->oobsize : 0);
-
-	/* check, if length is not larger than device */
-	if (((imglen / pagelen) * meminfo->oobblock)
-	     > (meminfo->size - opts->offset)) {
-		printf("Image %d bytes, NAND page %d bytes, "
-		       "OOB area %u bytes, device size %u bytes\n",
-		       imglen, pagelen, meminfo->oobblock, meminfo->size);
-		printf("Input block is larger than device\n");
-		return -1;
-	}
-
-	if (!opts->quiet)
-		printf("\n");
-
-	/* get data from input and write to the device */
-	while (imglen && (mtdoffset < meminfo->size)) {
-
-		WATCHDOG_RESET ();
-
-		/*
-		 * new eraseblock, check for bad block(s). Stay in the
-		 * loop to be sure if the offset changes because of
-		 * a bad block, that the next block that will be
-		 * written to is also checked. Thus avoiding errors if
-		 * the block(s) after the skipped block(s) is also bad
-		 * (number of blocks depending on the blockalign
-		 */
-		while (blockstart != (mtdoffset & (~meminfo->erasesize+1))) {
-			blockstart = mtdoffset & (~meminfo->erasesize+1);
-			offs = blockstart;
-			baderaseblock = 0;
-
-			/* check all the blocks in an erase block for
-			 * bad blocks */
-			do {
-				int ret = meminfo->block_isbad(meminfo, offs);
-
-				if (ret < 0) {
-					printf("Bad block check failed\n");
-					return -1;
-				}
-				if (ret == 1) {
-					baderaseblock = 1;
-					if (!opts->quiet)
-						printf("\rBad block at 0x%lx "
-						       "in erase block from "
-						       "0x%x will be skipped\n",
-						       (long) offs,
-						       blockstart);
-				}
-
-				if (baderaseblock) {
-					mtdoffset = blockstart
-						+ meminfo->erasesize;
-				}
-				offs +=	 meminfo->erasesize;
-
-			} while (offs < blockstart + meminfo->erasesize);
-		}
-
-
-		/* read page data to memory buffer */
-		result = meminfo->read(meminfo,
-				       mtdoffset,
-				       meminfo->oobblock,
-				       &readlen,
-				       (unsigned char *) &data_buf);
-
-		if (result != 0) {
-			printf("reading NAND page at offset 0x%lx failed\n",
-			       mtdoffset);
-			return -1;
-		}
-
-		if (imglen < readlen) {
-			readlen = imglen;
-		}
-
-		memcpy(buffer, data_buf, readlen);
-		buffer += readlen;
-		imglen -= readlen;
-
-		if (opts->readoob) {
-			result = meminfo->read_oob(meminfo,
-						   mtdoffset,
-						   meminfo->oobsize,
-						   &readlen,
-						   (unsigned char *)
-						   &oob_buf);
-
-			if (result != 0) {
-				printf("\nMTD readoob failure: %d\n",
-				       result);
-				return -1;
-			}
-
-
-			if (imglen < readlen) {
-				readlen = imglen;
-			}
-
-			memcpy(buffer, oob_buf, readlen);
-
-			buffer += readlen;
-			imglen -= readlen;
-		}
-
-		if (!opts->quiet) {
-			unsigned long long n = (unsigned long long)
-				 (opts->length-imglen) * 100;
-			int percent;
-
-			do_div(n, opts->length);
-			percent = (int)n;
-
-			/* output progress message only at whole percent
-			 * steps to reduce the number of messages printed
-			 * on (slow) serial consoles
-			 */
-			if (percent != percent_complete) {
-			if (!opts->quiet)
-				printf("\rReading data from 0x%lx "
-				       "-- %3d%% complete.",
-				       mtdoffset, percent);
-				percent_complete = percent;
-			}
-		}
-
-		mtdoffset += meminfo->oobblock;
-	}
-
-	if (!opts->quiet)
-		printf("\n");
-
-	if (imglen > 0) {
-		printf("Could not read entire image due to bad blocks\n");
-		return -1;
-	}
-
-	/* return happy */
-	return 0;
-}
-
+/* XXX U-BOOT XXX */
+#if 0
 /******************************************************************************
  * Support for locking / unlocking operations of some NAND devices
  *****************************************************************************/
@@ -784,7 +334,7 @@ int nand_get_lock_status(nand_info_t *meminfo, ulong offset)
 	this->select_chip(meminfo, chipnr);
 
 
-	if ((offset & (meminfo->oobblock - 1)) != 0) {
+	if ((offset & (meminfo->writesize - 1)) != 0) {
 		printf ("nand_get_lock_status: "
 			"Start address must be beginning of "
 			"nand page!\n");
@@ -813,7 +363,7 @@ int nand_get_lock_status(nand_info_t *meminfo, ulong offset)
  * @param meminfo	nand mtd instance
  * @param start		start byte address
  * @param length	number of bytes to unlock (must be a multiple of
- *			page size nand->oobblock)
+ *			page size nand->writesize)
  *
  * @return		0 on success, -1 in case of error
  */
@@ -839,14 +389,14 @@ int nand_unlock(nand_info_t *meminfo, ulong start, ulong length)
 		goto out;
 	}
 
-	if ((start & (meminfo->oobblock - 1)) != 0) {
+	if ((start & (meminfo->writesize - 1)) != 0) {
 		printf ("nand_unlock: Start address must be beginning of "
 			"nand page!\n");
 		ret = -1;
 		goto out;
 	}
 
-	if (length == 0 || (length & (meminfo->oobblock - 1)) != 0) {
+	if (length == 0 || (length & (meminfo->writesize - 1)) != 0) {
 		printf ("nand_unlock: Length must be a multiple of nand page "
 			"size!\n");
 		ret = -1;
@@ -875,5 +425,186 @@ int nand_unlock(nand_info_t *meminfo, ulong start, ulong length)
 	this->select_chip(meminfo, -1);
 	return ret;
 }
-
 #endif
+
+/**
+ * get_len_incl_bad
+ *
+ * Check if length including bad blocks fits into device.
+ *
+ * @param nand NAND device
+ * @param offset offset in flash
+ * @param length image length
+ * @return image length including bad blocks
+ */
+static size_t get_len_incl_bad (nand_info_t *nand, size_t offset,
+                                const size_t length)
+{
+	size_t len_incl_bad = 0;
+	size_t len_excl_bad = 0;
+	size_t block_len;
+
+	while (len_excl_bad < length) {
+		block_len = nand->erasesize - (offset & (nand->erasesize - 1));
+
+		if (!nand_block_isbad (nand, offset & ~(nand->erasesize - 1)))
+			len_excl_bad += block_len;
+
+		len_incl_bad += block_len;
+		offset       += block_len;
+
+		if ((offset + len_incl_bad) >= nand->size)
+			break;
+	}
+
+	return len_incl_bad;
+}
+
+/**
+ * nand_write_skip_bad:
+ *
+ * Write image to NAND flash.
+ * Blocks that are marked bad are skipped and the is written to the next
+ * block instead as long as the image is short enough to fit even after
+ * skipping the bad blocks.
+ *
+ * @param nand  	NAND device
+ * @param offset	offset in flash
+ * @param length	buffer length
+ * @param buf           buffer to read from
+ * @return		0 in case of success
+ */
+int nand_write_skip_bad(nand_info_t *nand, size_t offset, size_t *length,
+                        u_char *buffer)
+{
+	int rval;
+	size_t left_to_write = *length;
+	size_t len_incl_bad;
+	u_char *p_buffer = buffer;
+
+	/* Reject writes, which are not page aligned */
+	if ((offset & (nand->writesize - 1)) != 0 ||
+	    (*length & (nand->writesize - 1)) != 0) {
+		printf ("Attempt to write non page aligned data\n");
+		return -EINVAL;
+	}
+
+	len_incl_bad = get_len_incl_bad (nand, offset, *length);
+
+	if ((offset + len_incl_bad) >= nand->size) {
+		printf ("Attempt to write outside the flash area\n");
+		return -EINVAL;
+	}
+
+	if (len_incl_bad == *length) {
+		rval = nand_write (nand, offset, length, buffer);
+		if (rval != 0) {
+			printf ("NAND write to offset %x failed %d\n",
+			        offset, rval);
+			return rval;
+		}
+	}
+
+	while (left_to_write > 0) {
+		size_t block_offset = offset & (nand->erasesize - 1);
+		size_t write_size;
+
+		if (nand_block_isbad (nand, offset & ~(nand->erasesize - 1))) {
+			printf ("Skip bad block 0x%08x\n",
+				offset & ~(nand->erasesize - 1));
+			offset += nand->erasesize - block_offset;
+			continue;
+		}
+
+		if (left_to_write < (nand->erasesize - block_offset))
+			write_size = left_to_write;
+		else
+			write_size = nand->erasesize - block_offset;
+
+		rval = nand_write (nand, offset, &write_size, p_buffer);
+		if (rval != 0) {
+			printf ("NAND write to offset %x failed %d\n",
+			        offset, rval);
+			*length -= left_to_write;
+			return rval;
+		}
+
+		left_to_write -= write_size;
+		offset        += write_size;
+		p_buffer      += write_size;
+	}
+
+	return 0;
+}
+
+/**
+ * nand_read_skip_bad:
+ *
+ * Read image from NAND flash.
+ * Blocks that are marked bad are skipped and the next block is readen
+ * instead as long as the image is short enough to fit even after skipping the
+ * bad blocks.
+ *
+ * @param nand NAND device
+ * @param offset offset in flash
+ * @param length buffer length, on return holds remaining bytes to read
+ * @param buffer buffer to write to
+ * @return 0 in case of success
+ */
+int nand_read_skip_bad(nand_info_t *nand, size_t offset, size_t *length,
+		       u_char *buffer)
+{
+	int rval;
+	size_t left_to_read = *length;
+	size_t len_incl_bad;
+	u_char *p_buffer = buffer;
+
+	len_incl_bad = get_len_incl_bad (nand, offset, *length);
+
+	if ((offset + len_incl_bad) >= nand->size) {
+		printf ("Attempt to read outside the flash area\n");
+		return -EINVAL;
+	}
+
+	if (len_incl_bad == *length) {
+		rval = nand_read (nand, offset, length, buffer);
+		if (rval != 0) {
+			printf ("NAND read from offset %x failed %d\n",
+			        offset, rval);
+			return rval;
+		}
+	}
+
+	while (left_to_read > 0) {
+		size_t block_offset = offset & (nand->erasesize - 1);
+		size_t read_length;
+
+		if (nand_block_isbad (nand, offset & ~(nand->erasesize - 1))) {
+			printf ("Skipping bad block 0x%08x\n",
+				offset & ~(nand->erasesize - 1));
+			offset += nand->erasesize - block_offset;
+			continue;
+		}
+
+		if (left_to_read < (nand->erasesize - block_offset))
+			read_length = left_to_read;
+		else
+			read_length = nand->erasesize - block_offset;
+
+		rval = nand_read (nand, offset, &read_length, p_buffer);
+		if (rval != 0) {
+			printf ("NAND read from offset %x failed %d\n",
+			        offset, rval);
+			*length -= left_to_read;
+			return rval;
+		}
+
+		left_to_read -= read_length;
+		offset       += read_length;
+		p_buffer     += read_length;
+	}
+
+	return 0;
+}
+
+#endif /* defined(CONFIG_CMD_NAND) && !defined(CFG_NAND_LEGACY) */

drivers/mtd/onenand/onenand_base.c

@@ -19,6 +19,7 @@
 
 #include <asm/io.h>
 #include <asm/errno.h>
+#include <malloc.h>
 
 /* It should access 16-bit instead of 8-bit */
 static inline void *memcpy_16(void *dst, const void *src, unsigned int len)
@@ -1110,21 +1111,21 @@ int onenand_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
  *
  * Print device ID
  */
-void onenand_print_device_info(int device, int verbose)
+char * onenand_print_device_info(int device)
 {
 	int vcc, demuxed, ddp, density;
-
-	if (!verbose)
-		return;
+	char *dev_info = malloc(80);
 
 	vcc = device & ONENAND_DEVICE_VCC_MASK;
 	demuxed = device & ONENAND_DEVICE_IS_DEMUX;
 	ddp = device & ONENAND_DEVICE_IS_DDP;
 	density = device >> ONENAND_DEVICE_DENSITY_SHIFT;
-	printk(KERN_INFO "%sOneNAND%s %dMB %sV 16-bit (0x%02x)\n",
+	sprintf(dev_info, "%sOneNAND%s %dMB %sV 16-bit (0x%02x)",
 	       demuxed ? "" : "Muxed ",
 	       ddp ? "(DDP)" : "",
 	       (16 << density), vcc ? "2.65/3.3" : "1.8", device);
+
+	return dev_info;
 }
 
 static const struct onenand_manufacturers onenand_manuf_ids[] = {
@@ -1203,7 +1204,7 @@ static int onenand_probe(struct mtd_info *mtd)
 	}
 
 	/* Flash device information */
-	onenand_print_device_info(dev_id, 0);
+	mtd->name = onenand_print_device_info(dev_id);
 	this->device_id = dev_id;
 
 	density = dev_id >> ONENAND_DEVICE_DENSITY_SHIFT;
@@ -1239,6 +1240,17 @@ static int onenand_probe(struct mtd_info *mtd)
 		this->options |= ONENAND_CONT_LOCK;
 	}
 
+	mtd->erase = onenand_erase;
+	mtd->read = onenand_read;
+	mtd->write = onenand_write;
+	mtd->read_ecc = onenand_read_ecc;
+	mtd->write_ecc = onenand_write_ecc;
+	mtd->read_oob = onenand_read_oob;
+	mtd->write_oob = onenand_write_oob;
+	mtd->sync = onenand_sync;
+	mtd->block_isbad = onenand_block_isbad;
+	mtd->block_markbad = onenand_block_markbad;
+
 	return 0;
 }
 

fs/Makefile

@@ -22,7 +22,7 @@
 #
 #
 
-SUBDIRS	:= jffs2 cramfs fdos fat reiserfs ext2
+SUBDIRS	:= jffs2 cramfs fdos fat reiserfs ext2 yaffs2
 
 $(obj).depend all:
 	@for dir in $(SUBDIRS) ; do \

fs/yaffs2/Makefile

@@ -0,0 +1,56 @@
+# Makefile for YAFFS direct test
+#
+#
+# YAFFS: Yet another Flash File System. A NAND-flash specific file system.
+#
+# Copyright (C) 2003 Aleph One Ltd.
+#
+#
+# Created by Charles Manning <charles@aleph1.co.uk>
+#
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License version 2 as
+# published by the Free Software Foundation.
+#
+# NB Warning this Makefile does not include header dependencies.
+#
+# $Id: Makefile,v 1.15 2007/07/18 19:40:38 charles Exp $
+
+#EXTRA_COMPILE_FLAGS = -DYAFFS_IGNORE_TAGS_ECC
+include $(TOPDIR)/config.mk
+
+LIB = $(obj)libyaffs2.a
+
+COBJS-$(CONFIG_YAFFS2) := \
+	yaffscfg.o yaffs_ecc.o yaffsfs.o yaffs_guts.o yaffs_packedtags1.o \
+	yaffs_tagscompat.o yaffs_packedtags2.o yaffs_tagsvalidity.o \
+	yaffs_nand.o yaffs_checkptrw.o yaffs_qsort.o yaffs_mtdif.o \
+	yaffs_mtdif2.o
+
+SRCS    := $(COBJS-y:.o=.c)
+OBJS    := $(addprefix $(obj),$(COBJS-y))
+
+# -DCONFIG_YAFFS_NO_YAFFS1
+CFLAGS +=    -DCONFIG_YAFFS_DIRECT -DCONFIG_YAFFS_SHORT_NAMES_IN_RAM -DCONFIG_YAFFS_YAFFS2 -DNO_Y_INLINE -DLINUX_VERSION_CODE=0x20622 
+
+all:  $(LIB)
+
+$(LIB): $(obj).depend $(OBJS)
+	$(AR) $(ARFLAGS) $@ $(OBJS)
+
+.PHONY: clean distclean
+clean:
+	rm -f $(OBJS)
+
+distclean:  clean
+	rm -f $(LIB) core *.bak .depend
+
+#########################################################################
+
+# defines $(obj).depend target
+include $(SRCTREE)/rules.mk
+
+sinclude $(obj).depend
+
+#########################################################################
+

fs/yaffs2/README-linux

@@ -0,0 +1,201 @@
+Welcome to YAFFS, the first file system developed specifically for NAND flash.
+
+It is now YAFFS2 - original YAFFS (AYFFS1) only supports 512-byte page
+NAND and is now deprectated. YAFFS2 supports 512b page in 'YAFFS1
+compatibility' mode (CONFIG_YAFFS_YAFFS1) and 2K or larger page NAND
+in YAFFS2 mode (CONFIG_YAFFS_YAFFS2).
+
+
+A note on licencing
+-------------------
+YAFFS is available under the GPL and via alternative licensing 
+arrangements with Aleph One. If you're using YAFFS as a Linux kernel
+file system then it will be under the GPL. For use in other situations
+you should discuss licensing issues with Aleph One.
+
+
+Terminology
+-----------
+Page -  NAND addressable unit (normally 512b or 2Kbyte size) - can
+        be read, written, marked bad. Has associated OOB.
+Block - Eraseable unit. 64 Pages. (128K on 2K NAND, 32K on 512b NAND)
+OOB -   'spare area' of each page for ECC, bad block marked and YAFFS
+        tags. 16 bytes per 512b - 64 bytes for 2K page size.
+Chunk - Basic YAFFS addressable unit. Same size as Page.
+Object - YAFFS Object: File, Directory, Link, Device etc.
+
+YAFFS design
+------------
+
+YAFFS is a log-structured filesystem. It is designed particularly for
+NAND (as opposed to NOR) flash, to be flash-friendly, robust due to
+journalling, and to have low RAM and boot time overheads. File data is
+stored in 'chunks'. Chunks are the same size as NAND pages. Each page
+is marked with file id and chunk number. These marking 'tags' are
+stored in the OOB (or 'spare') region of the flash. The chunk number
+is determined by dividing the file position by the chunk size. Each
+chunk has a number of valid bytes, which equals the page size for all
+except the last chunk in a file.
+
+File 'headers' are stored as the first page in a file, marked as a
+different type to data pages. The same mechanism is used to store
+directories, device files, links etc. The first page describes which
+type of object it is.
+
+YAFFS2 never re-writes a page, because the spec of NAND chips does not
+allow it. (YAFFS1 used to mark a block 'deleted' in the OOB). Deletion
+is managed by moving deleted objects to the special, hidden 'unlinked'
+directory. These records are preserved until all the pages containing
+the object have been erased (We know when this happen by keeping a
+count of chunks remaining on the system for each object - when it
+reaches zero the object really is gone). 
+
+When data in a file is overwritten, the relevant chunks are replaced
+by writing new pages to flash containing the new data but the same
+tags. 
+
+Pages are also marked with a short (2 bit) serial number that 
+increments each time the page at this position is incremented. The 
+reason for this is that if power loss/crash/other act of demonic 
+forces happens before the replaced page is marked as discarded, it is 
+possible to have two pages with the same tags. The serial number is 
+used to arbitrate.
+
+A block containing only discarded pages (termed a dirty block) is an 
+obvious candidate for garbage collection. Otherwise valid pages can be
+copied off a block thus rendering the whole block discarded and ready 
+for garbage collection.  
+          
+In theory you don't need to hold the file structure in RAM... you
+could just scan the whole flash looking for pages when you need them.
+In practice though you'd want better file access times than that! The
+mechanism proposed here is to have a list of __u16 page addresses 
+associated with each file. Since there are 2^18 pages in a 128MB NAND,
+a __u16 is insufficient to uniquely identify a page but is does
+identify a group of 4 pages - a small enough region to search
+exhaustively. This mechanism is clearly expandable to larger NAND
+devices - within reason. The RAM overhead with this approach is approx
+2 bytes per page - 512kB of RAM for a whole 128MB NAND.
+
+Boot-time scanning to build the file structure lists only requires    
+one pass reading NAND. If proper shutdowns happen the current RAM
+summary of the filesystem status is saved to flash, called
+'checkpointing'. This saves re-scanning the flash on startup, and gives
+huge boot/mount time savings. 
+
+YAFFS regenerates its state by 'replaying the tape'  - i.e. by
+scanning the chunks in their allocation order (i.e. block sequence ID
+order), which is usually different form the media block order. Each
+block is still only read once - starting from the end of the media and
+working back. 
+
+YAFFS tags in YAFFS1 mode:
+
+18-bit Object ID (2^18 files, i.e. > 260,000 files). File id 0- is not
+       valid and indicates a deleted page. File od 0x3ffff is also not valid.
+       Synonymous with inode.
+2-bit  serial number
+20-bit Chunk ID within file. Limit of 2^20 chunks/pages per file (i.e.
+       > 500MB max file size). Chunk ID 0 is the file header for the file.
+10-bit counter of the number of bytes used in the page.
+12 bit ECC on tags
+
+YAFFS tags in YAFFS2 mode:
+  4 bytes 32-bit chunk ID
+  4 bytes 32-bit object ID
+  2 bytes Number of data bytes in this chunk
+  4 bytes Sequence number for this block
+  3 bytes ECC on tags
+ 12 bytes ECC on data (3 bytes per 256 bytes of data)
+
+
+Page allocation and garbage collection       
+         
+Pages are allocated sequentially from the currently selected block.  
+When all the pages in the block are filled, another clean block is 
+selected for allocation. At least two or three clean blocks are 
+reserved for garbage collection purposes. If there are insufficient 
+clean blocks available, then a dirty block ( ie one containing only 
+discarded pages) is erased to free it up as a clean block. If no dirty
+blocks are available, then the dirtiest block is selected for garbage 
+collection.  
+          
+Garbage collection is performed by copying the valid data pages into 
+new data pages thus rendering all the pages in this block dirty and 
+freeing it up for erasure. I also like the idea of selecting a block 
+at random some small percentage of the time - thus reducing the chance
+of wear differences.
+
+YAFFS is single-threaded. Garbage-collection is done as a parasitic
+task of writing data. So each time some data is written, a bit of
+pending garbage collection is done. More pages are garbage-collected
+when free space is tight. 
+
+
+Flash writing
+
+YAFFS only ever writes each page once, complying with the requirements
+of the most restricitve NAND devices.
+
+Wear levelling
+
+This comes as a side-effect of the block-allocation strategy. Data is
+always written on the next free block, so they are all used equally.
+Blocks containing data that is written but never erased will not get
+back into the free list, so wear is levelled over only blocks which
+are free or become free, not blocks which never change. 
+
+
+
+Some helpful info
+-----------------
+
+Formatting a YAFFS device is simply done by erasing it.
+
+Making an initial filesystem can be tricky because YAFFS uses the OOB
+and thus the bytes that get written depend on the YAFFS data (tags),
+and the ECC bytes and bad block markers which are dictated by the
+hardware and/or the MTD subsystem. The data layout also depends on the
+device page size (512b or 2K). Because YAFFS is only responsible for
+some of the OOB data, generating a filesystem offline requires
+detailed knowledge of what the other parts (MTD and NAND
+driver/hardware) are going to do.
+
+To make a YAFFS filesystem you have 3 options:
+
+1) Boot the system with an empty NAND device mounted as YAFFS and copy
+   stuff on.
+
+2) Make a filesystem image offline, then boot the system and use
+   MTDutils to write an image to flash.
+
+3) Make a filesystem image offline and use some tool like a bootloader to
+   write it to flash.
+
+Option 1 avoids a lot of issues because all the parts
+(YAFFS/MTD/hardware) all take care of their own bits and (if you have
+put things together properly) it will 'just work'. YAFFS just needs to
+know how many bytes of the OOB it can use. However sometimes it is not
+practical.
+
+Option 2 lets MTD/hardware take care of the ECC so the filesystem
+image just had to know which bytes to use for YAFFS Tags.
+
+Option 3 is hardest as the image creator needs to know exactly what
+ECC bytes, endianness and algorithm to use as well as which bytes are
+available to YAFFS. 
+
+mkyaffs2image creates an image suitable for option 3 for the
+particular case of yaffs2 on 2K page NAND with default MTD layout.
+
+mkyaffsimage creates an equivalent image for 512b page NAND (i.e.
+yaffs1 format).
+
+Bootloaders
+-----------
+
+A bootloader using YAFFS needs to know how MTD is laying out the OOB
+so that it can skip bad blocks. 
+
+YAFFS Tracing
+-------------

fs/yaffs2/devextras.h

@@ -0,0 +1,275 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * This file is just holds extra declarations used during development.
+ * Most of these are from kernel includes placed here so we can use them in 
+ * applications.
+ *
+ */
+
+#ifndef __EXTRAS_H__
+#define __EXTRAS_H__
+
+#if defined WIN32
+#define __inline__ __inline
+#define new newHack
+#endif
+
+/* XXX U-BOOT XXX */
+#if 1 /* !(defined __KERNEL__) || (defined WIN32) */
+
+/* User space defines */
+
+/* XXX U-BOOT XXX */
+#if 0
+typedef unsigned char __u8;
+typedef unsigned short __u16;
+typedef unsigned __u32;
+#endif
+
+#include <asm/types.h>
+
+/*
+ * Simple doubly linked list implementation.
+ *
+ * Some of the internal functions ("__xxx") are useful when
+ * manipulating whole lists rather than single entries, as
+ * sometimes we already know the next/prev entries and we can
+ * generate better code by using them directly rather than
+ * using the generic single-entry routines.
+ */
+
+#define prefetch(x) 1
+
+struct list_head {
+	struct list_head *next, *prev;
+};
+
+#define LIST_HEAD_INIT(name) { &(name), &(name) }
+
+#define LIST_HEAD(name) \
+	struct list_head name = LIST_HEAD_INIT(name)
+
+#define INIT_LIST_HEAD(ptr) do { \
+	(ptr)->next = (ptr); (ptr)->prev = (ptr); \
+} while (0)
+
+/*
+ * Insert a new entry between two known consecutive entries.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static __inline__ void __list_add(struct list_head *new,
+				  struct list_head *prev,
+				  struct list_head *next)
+{
+	next->prev = new;
+	new->next = next;
+	new->prev = prev;
+	prev->next = new;
+}
+
+/**
+ * list_add - add a new entry
+ * @new: new entry to be added
+ * @head: list head to add it after
+ *
+ * Insert a new entry after the specified head.
+ * This is good for implementing stacks.
+ */
+static __inline__ void list_add(struct list_head *new, struct list_head *head)
+{
+	__list_add(new, head, head->next);
+}
+
+/**
+ * list_add_tail - add a new entry
+ * @new: new entry to be added
+ * @head: list head to add it before
+ *
+ * Insert a new entry before the specified head.
+ * This is useful for implementing queues.
+ */
+static __inline__ void list_add_tail(struct list_head *new,
+				     struct list_head *head)
+{
+	__list_add(new, head->prev, head);
+}
+
+/*
+ * Delete a list entry by making the prev/next entries
+ * point to each other.
+ *
+ * This is only for internal list manipulation where we know
+ * the prev/next entries already!
+ */
+static __inline__ void __list_del(struct list_head *prev,
+				  struct list_head *next)
+{
+	next->prev = prev;
+	prev->next = next;
+}
+
+/**
+ * list_del - deletes entry from list.
+ * @entry: the element to delete from the list.
+ * Note: list_empty on entry does not return true after this, the entry is
+ * in an undefined state.
+ */
+static __inline__ void list_del(struct list_head *entry)
+{
+	__list_del(entry->prev, entry->next);
+}
+
+/**
+ * list_del_init - deletes entry from list and reinitialize it.
+ * @entry: the element to delete from the list.
+ */
+static __inline__ void list_del_init(struct list_head *entry)
+{
+	__list_del(entry->prev, entry->next);
+	INIT_LIST_HEAD(entry);
+}
+
+/**
+ * list_empty - tests whether a list is empty
+ * @head: the list to test.
+ */
+static __inline__ int list_empty(struct list_head *head)
+{
+	return head->next == head;
+}
+
+/**
+ * list_splice - join two lists
+ * @list: the new list to add.
+ * @head: the place to add it in the first list.
+ */
+static __inline__ void list_splice(struct list_head *list,
+				   struct list_head *head)
+{
+	struct list_head *first = list->next;
+
+	if (first != list) {
+		struct list_head *last = list->prev;
+		struct list_head *at = head->next;
+
+		first->prev = head;
+		head->next = first;
+
+		last->next = at;
+		at->prev = last;
+	}
+}
+
+/**
+ * list_entry - get the struct for this entry
+ * @ptr:	the &struct list_head pointer.
+ * @type:	the type of the struct this is embedded in.
+ * @member:	the name of the list_struct within the struct.
+ */
+#define list_entry(ptr, type, member) \
+	((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
+
+/**
+ * list_for_each	-	iterate over a list
+ * @pos:	the &struct list_head to use as a loop counter.
+ * @head:	the head for your list.
+ */
+#define list_for_each(pos, head) \
+	for (pos = (head)->next, prefetch(pos->next); pos != (head); \
+        	pos = pos->next, prefetch(pos->next))
+
+/**
+ * list_for_each_safe	-	iterate over a list safe against removal
+ *                              of list entry
+ * @pos:	the &struct list_head to use as a loop counter.
+ * @n:		another &struct list_head to use as temporary storage
+ * @head:	the head for your list.
+ */
+#define list_for_each_safe(pos, n, head) \
+	for (pos = (head)->next, n = pos->next; pos != (head); \
+		pos = n, n = pos->next)
+
+/*
+ * File types
+ */
+#define DT_UNKNOWN	0
+#define DT_FIFO		1
+#define DT_CHR		2
+#define DT_DIR		4
+#define DT_BLK		6
+#define DT_REG		8
+#define DT_LNK		10
+#define DT_SOCK		12
+#define DT_WHT		14
+
+#ifndef WIN32
+/* XXX U-BOOT XXX */
+#if 0
+#include <sys/stat.h>
+#else
+#include "common.h"
+#endif
+#endif
+
+/*
+ * Attribute flags.  These should be or-ed together to figure out what
+ * has been changed!
+ */
+#define ATTR_MODE	1
+#define ATTR_UID	2
+#define ATTR_GID	4
+#define ATTR_SIZE	8
+#define ATTR_ATIME	16
+#define ATTR_MTIME	32
+#define ATTR_CTIME	64
+#define ATTR_ATIME_SET	128
+#define ATTR_MTIME_SET	256
+#define ATTR_FORCE	512	/* Not a change, but a change it */
+#define ATTR_ATTR_FLAG	1024
+
+struct iattr {
+	unsigned int ia_valid;
+	unsigned ia_mode;
+	unsigned ia_uid;
+	unsigned ia_gid;
+	unsigned ia_size;
+	unsigned ia_atime;
+	unsigned ia_mtime;
+	unsigned ia_ctime;
+	unsigned int ia_attr_flags;
+};
+
+#define KERN_DEBUG
+
+#else
+
+#ifndef WIN32
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#endif
+
+#endif
+
+#if defined WIN32
+#undef new
+#endif
+
+#endif

fs/yaffs2/yaffs_checkptrw.c

@@ -0,0 +1,405 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* XXX U-BOOT XXX */
+#include <common.h>
+#include <malloc.h>
+
+const char *yaffs_checkptrw_c_version =
+    "$Id: yaffs_checkptrw.c,v 1.14 2007/05/15 20:07:40 charles Exp $";
+
+
+#include "yaffs_checkptrw.h"
+
+
+static int yaffs_CheckpointSpaceOk(yaffs_Device *dev)
+{
+
+	int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
+	
+	T(YAFFS_TRACE_CHECKPOINT,
+		(TSTR("checkpt blocks available = %d" TENDSTR),
+		blocksAvailable));
+		
+	
+	return (blocksAvailable <= 0) ? 0 : 1;
+}
+
+
+static int yaffs_CheckpointErase(yaffs_Device *dev)
+{
+	
+	int i;
+	
+
+	if(!dev->eraseBlockInNAND)	
+		return 0;
+	T(YAFFS_TRACE_CHECKPOINT,(TSTR("checking blocks %d to %d"TENDSTR),
+		dev->internalStartBlock,dev->internalEndBlock));
+		
+	for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
+		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
+		if(bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT){
+			T(YAFFS_TRACE_CHECKPOINT,(TSTR("erasing checkpt block %d"TENDSTR),i));
+			if(dev->eraseBlockInNAND(dev,i- dev->blockOffset /* realign */)){
+				bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
+				dev->nErasedBlocks++;
+				dev->nFreeChunks += dev->nChunksPerBlock;
+			}
+			else {
+				dev->markNANDBlockBad(dev,i);
+				bi->blockState = YAFFS_BLOCK_STATE_DEAD;
+			}
+		}
+	}
+	
+	dev->blocksInCheckpoint = 0;
+	
+	return 1;
+}
+
+
+static void yaffs_CheckpointFindNextErasedBlock(yaffs_Device *dev)
+{
+	int  i;
+	int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
+	T(YAFFS_TRACE_CHECKPOINT,
+		(TSTR("allocating checkpt block: erased %d reserved %d avail %d next %d "TENDSTR),
+		dev->nErasedBlocks,dev->nReservedBlocks,blocksAvailable,dev->checkpointNextBlock));
+		
+	if(dev->checkpointNextBlock >= 0 &&
+	   dev->checkpointNextBlock <= dev->internalEndBlock &&
+	   blocksAvailable > 0){
+	
+		for(i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++){
+			yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
+			if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY){
+				dev->checkpointNextBlock = i + 1;
+				dev->checkpointCurrentBlock = i;
+				T(YAFFS_TRACE_CHECKPOINT,(TSTR("allocating checkpt block %d"TENDSTR),i));
+				return;
+			}
+		}
+	}
+	T(YAFFS_TRACE_CHECKPOINT,(TSTR("out of checkpt blocks"TENDSTR)));
+	
+	dev->checkpointNextBlock = -1;
+	dev->checkpointCurrentBlock = -1;
+}
+
+static void yaffs_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
+{
+	int  i;
+	yaffs_ExtendedTags tags;
+	
+	T(YAFFS_TRACE_CHECKPOINT,(TSTR("find next checkpt block: start:  blocks %d next %d" TENDSTR),
+		dev->blocksInCheckpoint, dev->checkpointNextBlock));
+		
+	if(dev->blocksInCheckpoint < dev->checkpointMaxBlocks) 
+		for(i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++){
+			int chunk = i * dev->nChunksPerBlock;
+			int realignedChunk = chunk - dev->chunkOffset;
+
+			dev->readChunkWithTagsFromNAND(dev,realignedChunk,NULL,&tags);
+			T(YAFFS_TRACE_CHECKPOINT,(TSTR("find next checkpt block: search: block %d oid %d seq %d eccr %d" TENDSTR), 
+				i, tags.objectId,tags.sequenceNumber,tags.eccResult));
+						      
+			if(tags.sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA){
+				/* Right kind of block */
+				dev->checkpointNextBlock = tags.objectId;
+				dev->checkpointCurrentBlock = i;
+				dev->checkpointBlockList[dev->blocksInCheckpoint] = i;
+				dev->blocksInCheckpoint++;
+				T(YAFFS_TRACE_CHECKPOINT,(TSTR("found checkpt block %d"TENDSTR),i));
+				return;
+			}
+		}
+
+	T(YAFFS_TRACE_CHECKPOINT,(TSTR("found no more checkpt blocks"TENDSTR)));
+
+	dev->checkpointNextBlock = -1;
+	dev->checkpointCurrentBlock = -1;
+}
+
+
+int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
+{
+	
+	/* Got the functions we need? */
+	if (!dev->writeChunkWithTagsToNAND ||
+	    !dev->readChunkWithTagsFromNAND ||
+	    !dev->eraseBlockInNAND ||
+	    !dev->markNANDBlockBad)
+		return 0;
+
+	if(forWriting && !yaffs_CheckpointSpaceOk(dev))
+		return 0;
+			
+	if(!dev->checkpointBuffer)
+		dev->checkpointBuffer = YMALLOC_DMA(dev->nDataBytesPerChunk);
+	if(!dev->checkpointBuffer)
+		return 0;
+
+	
+	dev->checkpointPageSequence = 0;
+	
+	dev->checkpointOpenForWrite = forWriting;
+	
+	dev->checkpointByteCount = 0;
+	dev->checkpointSum = 0;
+	dev->checkpointXor = 0;
+	dev->checkpointCurrentBlock = -1;
+	dev->checkpointCurrentChunk = -1;
+	dev->checkpointNextBlock = dev->internalStartBlock;
+	
+	/* Erase all the blocks in the checkpoint area */
+	if(forWriting){
+		memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
+		dev->checkpointByteOffset = 0;
+		return yaffs_CheckpointErase(dev);
+		
+		
+	} else {
+		int i;
+		/* Set to a value that will kick off a read */
+		dev->checkpointByteOffset = dev->nDataBytesPerChunk;
+		/* A checkpoint block list of 1 checkpoint block per 16 block is (hopefully)
+		 * going to be way more than we need */
+		dev->blocksInCheckpoint = 0;
+		dev->checkpointMaxBlocks = (dev->internalEndBlock - dev->internalStartBlock)/16 + 2;
+		dev->checkpointBlockList = YMALLOC(sizeof(int) * dev->checkpointMaxBlocks);
+		for(i = 0; i < dev->checkpointMaxBlocks; i++)
+			dev->checkpointBlockList[i] = -1;
+	}
+	
+	return 1;
+}
+
+int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum)
+{
+	__u32 compositeSum;
+	compositeSum =  (dev->checkpointSum << 8) | (dev->checkpointXor & 0xFF);
+	*sum = compositeSum;
+	return 1;
+}
+
+static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
+{
+
+	int chunk;
+	int realignedChunk;
+
+	yaffs_ExtendedTags tags;
+	
+	if(dev->checkpointCurrentBlock < 0){
+		yaffs_CheckpointFindNextErasedBlock(dev);
+		dev->checkpointCurrentChunk = 0;
+	}
+	
+	if(dev->checkpointCurrentBlock < 0)
+		return 0;
+	
+	tags.chunkDeleted = 0;
+	tags.objectId = dev->checkpointNextBlock; /* Hint to next place to look */
+	tags.chunkId = dev->checkpointPageSequence + 1;
+	tags.sequenceNumber =  YAFFS_SEQUENCE_CHECKPOINT_DATA;
+	tags.byteCount = dev->nDataBytesPerChunk;
+	if(dev->checkpointCurrentChunk == 0){
+		/* First chunk we write for the block? Set block state to
+		   checkpoint */
+		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointCurrentBlock);
+		bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
+		dev->blocksInCheckpoint++;
+	}
+	
+	chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock + dev->checkpointCurrentChunk;
+
+	
+	T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint wite buffer nand %d(%d:%d) objid %d chId %d" TENDSTR),
+		chunk, dev->checkpointCurrentBlock, dev->checkpointCurrentChunk,tags.objectId,tags.chunkId)); 
+	
+	realignedChunk = chunk - dev->chunkOffset;
+	
+	dev->writeChunkWithTagsToNAND(dev,realignedChunk,dev->checkpointBuffer,&tags);
+	dev->checkpointByteOffset = 0;
+	dev->checkpointPageSequence++;	   
+	dev->checkpointCurrentChunk++;
+	if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock){
+		dev->checkpointCurrentChunk = 0;
+		dev->checkpointCurrentBlock = -1;
+	}
+	memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
+	
+	return 1;
+}
+
+
+int yaffs_CheckpointWrite(yaffs_Device *dev,const void *data, int nBytes)
+{
+	int i=0;
+	int ok = 1;
+
+	
+	__u8 * dataBytes = (__u8 *)data;
+	
+	
+
+	if(!dev->checkpointBuffer)
+		return 0;
+		
+	if(!dev->checkpointOpenForWrite)
+		return -1;
+
+	while(i < nBytes && ok) {
+		
+
+		
+		dev->checkpointBuffer[dev->checkpointByteOffset] = *dataBytes ;
+		dev->checkpointSum += *dataBytes;
+		dev->checkpointXor ^= *dataBytes;
+		 
+		dev->checkpointByteOffset++;
+		i++;
+		dataBytes++;
+		dev->checkpointByteCount++;
+		
+		
+		if(dev->checkpointByteOffset < 0 ||
+		   dev->checkpointByteOffset >= dev->nDataBytesPerChunk) 
+			ok = yaffs_CheckpointFlushBuffer(dev);
+
+	}
+	
+	return 	i;
+}
+
+int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
+{
+	int i=0;
+	int ok = 1;
+	yaffs_ExtendedTags tags;
+
+	
+	int chunk;
+	int realignedChunk;
+
+	__u8 *dataBytes = (__u8 *)data;
+		
+	if(!dev->checkpointBuffer)
+		return 0;
+
+	if(dev->checkpointOpenForWrite)
+		return -1;
+
+	while(i < nBytes && ok) {
+	
+	
+		if(dev->checkpointByteOffset < 0 ||
+		   dev->checkpointByteOffset >= dev->nDataBytesPerChunk) {
+		   
+		   	if(dev->checkpointCurrentBlock < 0){
+				yaffs_CheckpointFindNextCheckpointBlock(dev);
+				dev->checkpointCurrentChunk = 0;
+			}
+			
+			if(dev->checkpointCurrentBlock < 0)
+				ok = 0;
+			else {
+			
+				chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock + 
+				          dev->checkpointCurrentChunk;
+
+				realignedChunk = chunk - dev->chunkOffset;
+
+	   			/* read in the next chunk */
+	   			/* printf("read checkpoint page %d\n",dev->checkpointPage); */
+				dev->readChunkWithTagsFromNAND(dev, realignedChunk, 
+							       dev->checkpointBuffer,
+							      &tags);
+						      
+				if(tags.chunkId != (dev->checkpointPageSequence + 1) ||
+				   tags.sequenceNumber != YAFFS_SEQUENCE_CHECKPOINT_DATA)
+				   ok = 0;
+
+				dev->checkpointByteOffset = 0;
+				dev->checkpointPageSequence++;
+				dev->checkpointCurrentChunk++;
+			
+				if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock)
+					dev->checkpointCurrentBlock = -1;
+			}
+		}
+		
+		if(ok){
+			*dataBytes = dev->checkpointBuffer[dev->checkpointByteOffset];
+			dev->checkpointSum += *dataBytes;
+			dev->checkpointXor ^= *dataBytes;
+			dev->checkpointByteOffset++;
+			i++;
+			dataBytes++;
+			dev->checkpointByteCount++;
+		}
+	}
+	
+	return 	i;
+}
+
+int yaffs_CheckpointClose(yaffs_Device *dev)
+{
+
+	if(dev->checkpointOpenForWrite){	
+		if(dev->checkpointByteOffset != 0)
+			yaffs_CheckpointFlushBuffer(dev);
+	} else {
+		int i;
+		for(i = 0; i < dev->blocksInCheckpoint && dev->checkpointBlockList[i] >= 0; i++){
+			yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointBlockList[i]);
+			if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
+				bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
+			else {
+				// Todo this looks odd...
+			}
+		}
+		YFREE(dev->checkpointBlockList);
+		dev->checkpointBlockList = NULL;
+	}
+
+	dev->nFreeChunks -= dev->blocksInCheckpoint * dev->nChunksPerBlock;
+	dev->nErasedBlocks -= dev->blocksInCheckpoint;
+
+		
+	T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint byte count %d" TENDSTR),
+			dev->checkpointByteCount));
+			
+	if(dev->checkpointBuffer){
+		/* free the buffer */	
+		YFREE(dev->checkpointBuffer);
+		dev->checkpointBuffer = NULL;
+		return 1;
+	}
+	else
+		return 0;
+	
+}
+
+int yaffs_CheckpointInvalidateStream(yaffs_Device *dev)
+{
+	/* Erase the first checksum block */
+
+	T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint invalidate"TENDSTR)));
+
+	if(!yaffs_CheckpointSpaceOk(dev))
+		return 0;
+
+	return yaffs_CheckpointErase(dev);
+}

fs/yaffs2/yaffs_checkptrw.h

@@ -0,0 +1,35 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_CHECKPTRW_H__
+#define __YAFFS_CHECKPTRW_H__
+
+#include "yaffs_guts.h"
+
+int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting);
+
+int yaffs_CheckpointWrite(yaffs_Device *dev,const void *data, int nBytes);
+
+int yaffs_CheckpointRead(yaffs_Device *dev,void *data, int nBytes);
+
+int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum);
+
+int yaffs_CheckpointClose(yaffs_Device *dev);
+
+int yaffs_CheckpointInvalidateStream(yaffs_Device *dev);
+
+
+#endif
+

fs/yaffs2/yaffs_ecc.c

@@ -0,0 +1,333 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This code implements the ECC algorithm used in SmartMedia.
+ *
+ * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes. 
+ * The two unused bit are set to 1.
+ * The ECC can correct single bit errors in a 256-byte page of data. Thus, two such ECC 
+ * blocks are used on a 512-byte NAND page.
+ *
+ */
+
+/* Table generated by gen-ecc.c
+ * Using a table means we do not have to calculate p1..p4 and p1'..p4'
+ * for each byte of data. These are instead provided in a table in bits7..2.
+ * Bit 0 of each entry indicates whether the entry has an odd or even parity, and therefore
+ * this bytes influence on the line parity.
+ */
+
+/* XXX U-BOOT XXX */
+#include <common.h>
+
+const char *yaffs_ecc_c_version =
+    "$Id: yaffs_ecc.c,v 1.9 2007/02/14 01:09:06 wookey Exp $";
+
+#include "yportenv.h"
+
+#include "yaffs_ecc.h"
+
+static const unsigned char column_parity_table[] = {
+	0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69,
+	0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
+	0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc,
+	0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
+	0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0,
+	0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
+	0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65,
+	0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
+	0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc,
+	0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
+	0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59,
+	0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
+	0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55,
+	0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
+	0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0,
+	0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
+	0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0,
+	0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
+	0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55,
+	0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
+	0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59,
+	0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
+	0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc,
+	0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
+	0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65,
+	0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
+	0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0,
+	0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
+	0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc,
+	0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
+	0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69,
+	0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
+};
+
+/* Count the bits in an unsigned char or a U32 */
+
+static int yaffs_CountBits(unsigned char x)
+{
+	int r = 0;
+	while (x) {
+		if (x & 1)
+			r++;
+		x >>= 1;
+	}
+	return r;
+}
+
+static int yaffs_CountBits32(unsigned x)
+{
+	int r = 0;
+	while (x) {
+		if (x & 1)
+			r++;
+		x >>= 1;
+	}
+	return r;
+}
+
+/* Calculate the ECC for a 256-byte block of data */
+void yaffs_ECCCalculate(const unsigned char *data, unsigned char *ecc)
+{
+	unsigned int i;
+
+	unsigned char col_parity = 0;
+	unsigned char line_parity = 0;
+	unsigned char line_parity_prime = 0;
+	unsigned char t;
+	unsigned char b;
+
+	for (i = 0; i < 256; i++) {
+		b = column_parity_table[*data++];
+		col_parity ^= b;
+
+		if (b & 0x01)	// odd number of bits in the byte
+		{
+			line_parity ^= i;
+			line_parity_prime ^= ~i;
+		}
+
+	}
+
+	ecc[2] = (~col_parity) | 0x03;
+
+	t = 0;
+	if (line_parity & 0x80)
+		t |= 0x80;
+	if (line_parity_prime & 0x80)
+		t |= 0x40;
+	if (line_parity & 0x40)
+		t |= 0x20;
+	if (line_parity_prime & 0x40)
+		t |= 0x10;
+	if (line_parity & 0x20)
+		t |= 0x08;
+	if (line_parity_prime & 0x20)
+		t |= 0x04;
+	if (line_parity & 0x10)
+		t |= 0x02;
+	if (line_parity_prime & 0x10)
+		t |= 0x01;
+	ecc[1] = ~t;
+
+	t = 0;
+	if (line_parity & 0x08)
+		t |= 0x80;
+	if (line_parity_prime & 0x08)
+		t |= 0x40;
+	if (line_parity & 0x04)
+		t |= 0x20;
+	if (line_parity_prime & 0x04)
+		t |= 0x10;
+	if (line_parity & 0x02)
+		t |= 0x08;
+	if (line_parity_prime & 0x02)
+		t |= 0x04;
+	if (line_parity & 0x01)
+		t |= 0x02;
+	if (line_parity_prime & 0x01)
+		t |= 0x01;
+	ecc[0] = ~t;
+
+#ifdef CONFIG_YAFFS_ECC_WRONG_ORDER
+	// Swap the bytes into the wrong order
+	t = ecc[0];
+	ecc[0] = ecc[1];
+	ecc[1] = t;
+#endif
+}
+
+
+/* Correct the ECC on a 256 byte block of data */
+
+int yaffs_ECCCorrect(unsigned char *data, unsigned char *read_ecc,
+		     const unsigned char *test_ecc)
+{
+	unsigned char d0, d1, d2;	/* deltas */
+
+	d0 = read_ecc[0] ^ test_ecc[0];
+	d1 = read_ecc[1] ^ test_ecc[1];
+	d2 = read_ecc[2] ^ test_ecc[2];
+
+	if ((d0 | d1 | d2) == 0)
+		return 0; /* no error */
+
+	if (((d0 ^ (d0 >> 1)) & 0x55) == 0x55 &&
+	    ((d1 ^ (d1 >> 1)) & 0x55) == 0x55 &&
+	    ((d2 ^ (d2 >> 1)) & 0x54) == 0x54) {
+		/* Single bit (recoverable) error in data */
+
+		unsigned byte;
+		unsigned bit;
+
+#ifdef CONFIG_YAFFS_ECC_WRONG_ORDER
+		// swap the bytes to correct for the wrong order
+		unsigned char t;
+
+		t = d0;
+		d0 = d1;
+		d1 = t;
+#endif
+
+		bit = byte = 0;
+
+		if (d1 & 0x80)
+			byte |= 0x80;
+		if (d1 & 0x20)
+			byte |= 0x40;
+		if (d1 & 0x08)
+			byte |= 0x20;
+		if (d1 & 0x02)
+			byte |= 0x10;
+		if (d0 & 0x80)
+			byte |= 0x08;
+		if (d0 & 0x20)
+			byte |= 0x04;
+		if (d0 & 0x08)
+			byte |= 0x02;
+		if (d0 & 0x02)
+			byte |= 0x01;
+
+		if (d2 & 0x80)
+			bit |= 0x04;
+		if (d2 & 0x20)
+			bit |= 0x02;
+		if (d2 & 0x08)
+			bit |= 0x01;
+
+		data[byte] ^= (1 << bit);
+
+		return 1; /* Corrected the error */
+	}
+
+	if ((yaffs_CountBits(d0) + 
+	     yaffs_CountBits(d1) + 
+	     yaffs_CountBits(d2)) ==  1) {
+		/* Reccoverable error in ecc */
+
+		read_ecc[0] = test_ecc[0];
+		read_ecc[1] = test_ecc[1];
+		read_ecc[2] = test_ecc[2];
+
+		return 1; /* Corrected the error */
+	}
+	
+	/* Unrecoverable error */
+
+	return -1;
+
+}
+
+
+/*
+ * ECCxxxOther does ECC calcs on arbitrary n bytes of data
+ */
+void yaffs_ECCCalculateOther(const unsigned char *data, unsigned nBytes,
+			     yaffs_ECCOther * eccOther)
+{
+	unsigned int i;
+
+	unsigned char col_parity = 0;
+	unsigned line_parity = 0;
+	unsigned line_parity_prime = 0;
+	unsigned char b;
+
+	for (i = 0; i < nBytes; i++) {
+		b = column_parity_table[*data++];
+		col_parity ^= b;
+
+		if (b & 0x01)	 {
+			/* odd number of bits in the byte */
+			line_parity ^= i;
+			line_parity_prime ^= ~i;
+		}
+
+	}
+
+	eccOther->colParity = (col_parity >> 2) & 0x3f;
+	eccOther->lineParity = line_parity;
+	eccOther->lineParityPrime = line_parity_prime;
+}
+
+int yaffs_ECCCorrectOther(unsigned char *data, unsigned nBytes,
+			  yaffs_ECCOther * read_ecc,
+			  const yaffs_ECCOther * test_ecc)
+{
+	unsigned char cDelta;	/* column parity delta */
+	unsigned lDelta;	/* line parity delta */
+	unsigned lDeltaPrime;	/* line parity delta */
+	unsigned bit;
+
+	cDelta = read_ecc->colParity ^ test_ecc->colParity;
+	lDelta = read_ecc->lineParity ^ test_ecc->lineParity;
+	lDeltaPrime = read_ecc->lineParityPrime ^ test_ecc->lineParityPrime;
+
+	if ((cDelta | lDelta | lDeltaPrime) == 0)
+		return 0; /* no error */
+
+	if (lDelta == ~lDeltaPrime && 
+	    (((cDelta ^ (cDelta >> 1)) & 0x15) == 0x15))
+	{
+		/* Single bit (recoverable) error in data */
+
+		bit = 0;
+
+		if (cDelta & 0x20)
+			bit |= 0x04;
+		if (cDelta & 0x08)
+			bit |= 0x02;
+		if (cDelta & 0x02)
+			bit |= 0x01;
+
+		if(lDelta >= nBytes)
+			return -1;
+			
+		data[lDelta] ^= (1 << bit);
+
+		return 1; /* corrected */
+	}
+
+	if ((yaffs_CountBits32(lDelta) + yaffs_CountBits32(lDeltaPrime) +
+	     yaffs_CountBits(cDelta)) == 1) {
+		/* Reccoverable error in ecc */
+
+		*read_ecc = *test_ecc;
+		return 1; /* corrected */
+	}
+
+	/* Unrecoverable error */
+
+	return -1;
+
+}

fs/yaffs2/yaffs_ecc.h

@@ -0,0 +1,44 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+ /*
+  * This code implements the ECC algorithm used in SmartMedia.
+  *
+  * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes. 
+  * The two unused bit are set to 1.
+  * The ECC can correct single bit errors in a 256-byte page of data. Thus, two such ECC 
+  * blocks are used on a 512-byte NAND page.
+  *
+  */
+
+#ifndef __YAFFS_ECC_H__
+#define __YAFFS_ECC_H__
+
+typedef struct {
+	unsigned char colParity;
+	unsigned lineParity;
+	unsigned lineParityPrime;
+} yaffs_ECCOther;
+
+void yaffs_ECCCalculate(const unsigned char *data, unsigned char *ecc);
+int yaffs_ECCCorrect(unsigned char *data, unsigned char *read_ecc,
+		     const unsigned char *test_ecc);
+
+void yaffs_ECCCalculateOther(const unsigned char *data, unsigned nBytes,
+			     yaffs_ECCOther * ecc);
+int yaffs_ECCCorrectOther(unsigned char *data, unsigned nBytes,
+			  yaffs_ECCOther * read_ecc,
+			  const yaffs_ECCOther * test_ecc);
+#endif

fs/yaffs2/yaffs_flashif.h

@@ -0,0 +1,31 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_FLASH_H__
+#define __YAFFS_FLASH_H__
+
+
+#include "yaffs_guts.h"
+int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber);
+int yflash_WriteChunkToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare);
+int yflash_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags);
+int yflash_ReadChunkFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_Spare *spare);
+int yflash_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags);
+int yflash_EraseBlockInNAND(yaffs_Device *dev, int blockNumber);
+int yflash_InitialiseNAND(yaffs_Device *dev);
+int yflash_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo);
+int yflash_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber);
+
+#endif

fs/yaffs2/yaffs_guts.c

@@ -0,0 +1,7491 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* XXX U-BOOT XXX */
+#include <common.h>
+
+const char *yaffs_guts_c_version =
+    "$Id: yaffs_guts.c,v 1.52 2007/10/16 00:45:05 charles Exp $";
+
+#include "yportenv.h"
+#include "linux/stat.h"
+
+#include "yaffsinterface.h"
+#include "yaffsfs.h"
+#include "yaffs_guts.h"
+#include "yaffs_tagsvalidity.h"
+
+#include "yaffs_tagscompat.h"
+#ifndef  CONFIG_YAFFS_USE_OWN_SORT
+#include "yaffs_qsort.h"
+#endif
+#include "yaffs_nand.h"
+
+#include "yaffs_checkptrw.h"
+
+#include "yaffs_nand.h"
+#include "yaffs_packedtags2.h"
+
+#include "malloc.h"
+
+#ifdef CONFIG_YAFFS_WINCE
+void yfsd_LockYAFFS(BOOL fsLockOnly);
+void yfsd_UnlockYAFFS(BOOL fsLockOnly);
+#endif
+
+#define YAFFS_PASSIVE_GC_CHUNKS 2
+
+#include "yaffs_ecc.h"
+
+
+/* Robustification (if it ever comes about...) */
+static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND);
+static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk);
+static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
+				     const __u8 * data,
+				     const yaffs_ExtendedTags * tags);
+static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
+				    const yaffs_ExtendedTags * tags);
+
+/* Other local prototypes */
+static int yaffs_UnlinkObject( yaffs_Object *obj);
+static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
+
+static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
+
+static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device * dev,
+					     const __u8 * buffer,
+					     yaffs_ExtendedTags * tags,
+					     int useReserve);
+static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
+				  int chunkInNAND, int inScan);
+
+static yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
+					   yaffs_ObjectType type);
+static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
+				       yaffs_Object * obj);
+static int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name,
+				    int force, int isShrink, int shadows);
+static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj);
+static int yaffs_CheckStructures(void);
+static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
+			      int chunkOffset, int *limit);
+static int yaffs_DoGenericObjectDeletion(yaffs_Object * in);
+
+static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blockNo);
+
+static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo);
+static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
+				    int lineNo);
+
+static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
+				  int chunkInNAND);
+
+static int yaffs_UnlinkWorker(yaffs_Object * obj);
+static void yaffs_DestroyObject(yaffs_Object * obj);
+
+static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
+			   int chunkInObject);
+
+loff_t yaffs_GetFileSize(yaffs_Object * obj);
+
+static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr);
+
+static void yaffs_VerifyFreeChunks(yaffs_Device * dev);
+
+static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
+
+#ifdef YAFFS_PARANOID
+static int yaffs_CheckFileSanity(yaffs_Object * in);
+#else
+#define yaffs_CheckFileSanity(in)
+#endif
+
+static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in);
+static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId);
+
+static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
+
+static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
+				 yaffs_ExtendedTags * tags);
+
+static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos);
+static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
+					  yaffs_FileStructure * fStruct,
+					  __u32 chunkId);
+
+
+/* Function to calculate chunk and offset */
+
+static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, __u32 *chunk, __u32 *offset)
+{
+	if(dev->chunkShift){
+		/* Easy-peasy power of 2 case */
+		*chunk  = (__u32)(addr >> dev->chunkShift);
+		*offset = (__u32)(addr & dev->chunkMask);
+	}
+	else if(dev->crumbsPerChunk)
+	{
+		/* Case where we're using "crumbs" */
+		*offset = (__u32)(addr & dev->crumbMask);
+		addr >>= dev->crumbShift;
+		*chunk = ((__u32)addr)/dev->crumbsPerChunk;
+		*offset += ((addr - (*chunk * dev->crumbsPerChunk)) << dev->crumbShift);
+	}
+	else
+		YBUG();
+}
+
+/* Function to return the number of shifts for a power of 2 greater than or equal 
+ * to the given number
+ * Note we don't try to cater for all possible numbers and this does not have to
+ * be hellishly efficient.
+ */
+ 
+static __u32 ShiftsGE(__u32 x)
+{
+	int extraBits;
+	int nShifts;
+	
+	nShifts = extraBits = 0;
+	
+	while(x>1){
+		if(x & 1) extraBits++;
+		x>>=1;
+		nShifts++;
+	}
+
+	if(extraBits) 
+		nShifts++;
+		
+	return nShifts;
+}
+
+/* Function to return the number of shifts to get a 1 in bit 0
+ */
+ 
+static __u32 ShiftDiv(__u32 x)
+{
+	int nShifts;
+	
+	nShifts =  0;
+	
+	if(!x) return 0;
+	
+	while( !(x&1)){
+		x>>=1;
+		nShifts++;
+	}
+		
+	return nShifts;
+}
+
+
+
+/* 
+ * Temporary buffer manipulations.
+ */
+
+static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)	
+{
+	int i;
+	__u8 *buf = (__u8 *)1;
+		
+	memset(dev->tempBuffer,0,sizeof(dev->tempBuffer));
+		
+	for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
+		dev->tempBuffer[i].line = 0;	/* not in use */
+		dev->tempBuffer[i].buffer = buf =
+		    YMALLOC_DMA(dev->nDataBytesPerChunk);
+	}
+		
+	return buf ? YAFFS_OK : YAFFS_FAIL;
+	
+}
+
+static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo)
+{
+	int i, j;
+	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+		if (dev->tempBuffer[i].line == 0) {
+			dev->tempBuffer[i].line = lineNo;
+			if ((i + 1) > dev->maxTemp) {
+				dev->maxTemp = i + 1;
+				for (j = 0; j <= i; j++)
+					dev->tempBuffer[j].maxLine =
+					    dev->tempBuffer[j].line;
+			}
+
+			return dev->tempBuffer[i].buffer;
+		}
+	}
+
+	T(YAFFS_TRACE_BUFFERS,
+	  (TSTR("Out of temp buffers at line %d, other held by lines:"),
+	   lineNo));
+	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+		T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
+	}
+	T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
+
+	/*
+	 * If we got here then we have to allocate an unmanaged one
+	 * This is not good.
+	 */
+
+	dev->unmanagedTempAllocations++;
+	return YMALLOC(dev->nDataBytesPerChunk);
+
+}
+
+static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
+				    int lineNo)
+{
+	int i;
+	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+		if (dev->tempBuffer[i].buffer == buffer) {
+			dev->tempBuffer[i].line = 0;
+			return;
+		}
+	}
+
+	if (buffer) {
+		/* assume it is an unmanaged one. */
+		T(YAFFS_TRACE_BUFFERS,
+		  (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
+		   lineNo));
+		YFREE(buffer);
+		dev->unmanagedTempDeallocations++;
+	}
+
+}
+
+/*
+ * Determine if we have a managed buffer.
+ */
+int yaffs_IsManagedTempBuffer(yaffs_Device * dev, const __u8 * buffer)
+{
+	int i;
+	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+		if (dev->tempBuffer[i].buffer == buffer)
+			return 1;
+
+	}
+
+    for (i = 0; i < dev->nShortOpCaches; i++) {
+        if( dev->srCache[i].data == buffer )
+            return 1;
+
+    }
+
+    if (buffer == dev->checkpointBuffer)
+      return 1;
+
+    T(YAFFS_TRACE_ALWAYS,
+	  (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
+    return 0;
+}
+
+
+
+/*
+ * Chunk bitmap manipulations
+ */
+
+static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device * dev, int blk)
+{
+	if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
+		T(YAFFS_TRACE_ERROR,
+		  (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
+		   blk));
+		YBUG();
+	}
+	return dev->chunkBits +
+	    (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
+}
+
+static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
+{
+	if(blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
+	   chunk < 0 || chunk >= dev->nChunksPerBlock) {
+	   T(YAFFS_TRACE_ERROR,
+	    (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),blk,chunk));
+	    YBUG();
+	}
+}
+
+static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device * dev, int blk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+
+	memset(blkBits, 0, dev->chunkBitmapStride);
+}
+
+static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device * dev, int blk, int chunk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+
+	yaffs_VerifyChunkBitId(dev,blk,chunk);
+
+	blkBits[chunk / 8] &= ~(1 << (chunk & 7));
+}
+
+static Y_INLINE void yaffs_SetChunkBit(yaffs_Device * dev, int blk, int chunk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+	
+	yaffs_VerifyChunkBitId(dev,blk,chunk);
+
+	blkBits[chunk / 8] |= (1 << (chunk & 7));
+}
+
+static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device * dev, int blk, int chunk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+	yaffs_VerifyChunkBitId(dev,blk,chunk);
+
+	return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
+}
+
+static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device * dev, int blk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+	int i;
+	for (i = 0; i < dev->chunkBitmapStride; i++) {
+		if (*blkBits)
+			return 1;
+		blkBits++;
+	}
+	return 0;
+}
+
+static int yaffs_CountChunkBits(yaffs_Device * dev, int blk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+	int i;
+	int n = 0;
+	for (i = 0; i < dev->chunkBitmapStride; i++) {
+		__u8 x = *blkBits;
+		while(x){
+			if(x & 1)
+				n++;
+			x >>=1;
+		}
+			
+		blkBits++;
+	}
+	return n;
+}
+
+/* 
+ * Verification code
+ */
+ 
+static int yaffs_SkipVerification(yaffs_Device *dev)
+{
+	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_SkipFullVerification(yaffs_Device *dev)
+{
+	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_SkipNANDVerification(yaffs_Device *dev)
+{
+	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
+}
+
+static const char * blockStateName[] = {
+"Unknown",
+"Needs scanning",
+"Scanning",
+"Empty",
+"Allocating",
+"Full",
+"Dirty",
+"Checkpoint",
+"Collecting",
+"Dead"
+};
+
+static void yaffs_VerifyBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
+{
+	int actuallyUsed;
+	int inUse;
+	
+	if(yaffs_SkipVerification(dev))
+		return;
+		
+	/* Report illegal runtime states */
+	if(bi->blockState <0 || bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
+		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has undefined state %d"TENDSTR),n,bi->blockState));
+		
+	switch(bi->blockState){
+	 case YAFFS_BLOCK_STATE_UNKNOWN:
+	 case YAFFS_BLOCK_STATE_SCANNING:
+	 case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
+		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has bad run-state %s"TENDSTR),
+		n,blockStateName[bi->blockState]));
+	}
+	
+	/* Check pages in use and soft deletions are legal */
+	
+	actuallyUsed = bi->pagesInUse - bi->softDeletions;
+	
+	if(bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
+	   bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
+	   actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
+		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
+		n,bi->pagesInUse,bi->softDeletions));
+	
+		
+	/* Check chunk bitmap legal */
+	inUse = yaffs_CountChunkBits(dev,n);
+	if(inUse != bi->pagesInUse)
+		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
+			n,bi->pagesInUse,inUse));
+	
+	/* Check that the sequence number is valid.
+	 * Ten million is legal, but is very unlikely 
+	 */
+	if(dev->isYaffs2 && 
+	   (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
+	   (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000 ))
+		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has suspect sequence number of %d"TENDSTR),
+		n,bi->sequenceNumber));
+		
+}
+
+static void yaffs_VerifyCollectedBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
+{
+	yaffs_VerifyBlock(dev,bi,n);
+	
+	/* After collection the block should be in the erased state */
+	/* TODO: This will need to change if we do partial gc */
+	
+	if(bi->blockState != YAFFS_BLOCK_STATE_EMPTY){
+		T(YAFFS_TRACE_ERROR,(TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
+			n,bi->blockState));
+	}
+}
+
+static void yaffs_VerifyBlocks(yaffs_Device *dev)
+{
+	int i;
+	int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
+	int nIllegalBlockStates = 0;
+	
+
+	if(yaffs_SkipVerification(dev))
+		return;
+
+	memset(nBlocksPerState,0,sizeof(nBlocksPerState));
+
+		
+	for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++){
+		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
+		yaffs_VerifyBlock(dev,bi,i);
+
+		if(bi->blockState >=0 && bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
+			nBlocksPerState[bi->blockState]++;
+		else
+			nIllegalBlockStates++;
+					
+	}
+	
+	T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
+	T(YAFFS_TRACE_VERIFY,(TSTR("Block summary"TENDSTR)));
+	
+	T(YAFFS_TRACE_VERIFY,(TSTR("%d blocks have illegal states"TENDSTR),nIllegalBlockStates));
+	if(nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
+		T(YAFFS_TRACE_VERIFY,(TSTR("Too many allocating blocks"TENDSTR)));
+
+	for(i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
+		T(YAFFS_TRACE_VERIFY,
+		  (TSTR("%s %d blocks"TENDSTR),
+		  blockStateName[i],nBlocksPerState[i]));
+	
+	if(dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
+		T(YAFFS_TRACE_VERIFY,
+		 (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
+		 dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
+		 
+	if(dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
+		T(YAFFS_TRACE_VERIFY,
+		 (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
+		 dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
+		 
+	if(nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
+		T(YAFFS_TRACE_VERIFY,
+		 (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
+		 nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
+
+	T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
+
+}
+
+/*
+ * Verify the object header. oh must be valid, but obj and tags may be NULL in which
+ * case those tests will not be performed.
+ */
+static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
+{
+	if(yaffs_SkipVerification(obj->myDev))
+		return;
+		
+	if(!(tags && obj && oh)){
+	 	T(YAFFS_TRACE_VERIFY,
+		 		(TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
+		 		(__u32)tags,(__u32)obj,(__u32)oh));
+		return;
+	}
+	
+	if(oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
+	   oh->type > YAFFS_OBJECT_TYPE_MAX)
+	 	T(YAFFS_TRACE_VERIFY,
+		 (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
+		 tags->objectId, oh->type));
+
+	if(tags->objectId != obj->objectId)
+	 	T(YAFFS_TRACE_VERIFY,
+		 (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
+		 tags->objectId, obj->objectId));
+
+
+	/*
+	 * Check that the object's parent ids match if parentCheck requested.
+	 * 
+	 * Tests do not apply to the root object.
+	 */
+	
+	if(parentCheck && tags->objectId > 1 && !obj->parent)
+	 	T(YAFFS_TRACE_VERIFY,
+		 (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
+	 	 tags->objectId, oh->parentObjectId));
+		
+	
+	if(parentCheck && obj->parent &&
+	   oh->parentObjectId != obj->parent->objectId && 
+	   (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
+	    obj->parent->objectId != YAFFS_OBJECTID_DELETED))
+	 	T(YAFFS_TRACE_VERIFY,
+		 (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
+	 	 tags->objectId, oh->parentObjectId, obj->parent->objectId));
+		
+	
+	if(tags->objectId > 1 && oh->name[0] == 0) /* Null name */
+		T(YAFFS_TRACE_VERIFY,
+		(TSTR("Obj %d header name is NULL"TENDSTR),
+		 obj->objectId));
+
+	if(tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
+		T(YAFFS_TRACE_VERIFY,
+		(TSTR("Obj %d header name is 0xFF"TENDSTR),
+		 obj->objectId));
+}
+
+
+
+static int yaffs_VerifyTnodeWorker(yaffs_Object * obj, yaffs_Tnode * tn,
+				  	__u32 level, int chunkOffset)
+{
+	int i;
+	yaffs_Device *dev = obj->myDev;
+	int ok = 1;
+
+	if (tn) {
+		if (level > 0) {
+
+			for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
+				if (tn->internal[i]) {
+					ok = yaffs_VerifyTnodeWorker(obj,
+							tn->internal[i],
+							level - 1,
+							(chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
+				}
+			}
+		} else if (level == 0) {
+			int i;
+			yaffs_ExtendedTags tags;
+			__u32 objectId = obj->objectId;
+			
+			chunkOffset <<=  YAFFS_TNODES_LEVEL0_BITS;
+			
+			for(i = 0; i < YAFFS_NTNODES_LEVEL0; i++){
+				__u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
+				
+				if(theChunk > 0){
+					/* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
+					yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
+					if(tags.objectId != objectId || tags.chunkId != chunkOffset){
+						T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
+							objectId, chunkOffset, theChunk,
+							tags.objectId, tags.chunkId));
+					}
+				}
+				chunkOffset++;
+			}
+		}
+	}
+
+	return ok;
+
+}
+
+
+static void yaffs_VerifyFile(yaffs_Object *obj)
+{
+	int requiredTallness;
+	int actualTallness;
+	__u32 lastChunk;
+	__u32 x;
+	__u32 i;
+	yaffs_Device *dev;
+	yaffs_ExtendedTags tags;
+	yaffs_Tnode *tn;
+	__u32 objectId;
+	
+	if(obj && yaffs_SkipVerification(obj->myDev))
+		return;
+	
+	dev = obj->myDev;
+	objectId = obj->objectId;
+	
+	/* Check file size is consistent with tnode depth */
+	lastChunk =  obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
+	x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
+	requiredTallness = 0;
+	while (x> 0) {
+		x >>= YAFFS_TNODES_INTERNAL_BITS;
+		requiredTallness++;
+	}
+	
+	actualTallness = obj->variant.fileVariant.topLevel;
+	
+	if(requiredTallness > actualTallness )
+		T(YAFFS_TRACE_VERIFY,
+		(TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
+		 obj->objectId,actualTallness, requiredTallness));
+	
+	
+	/* Check that the chunks in the tnode tree are all correct. 
+	 * We do this by scanning through the tnode tree and
+	 * checking the tags for every chunk match.
+	 */
+
+	if(yaffs_SkipNANDVerification(dev))
+		return;
+		
+	for(i = 1; i <= lastChunk; i++){
+		tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant,i);
+
+		if (tn) {
+			__u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
+			if(theChunk > 0){
+				/* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
+				yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
+				if(tags.objectId != objectId || tags.chunkId != i){
+					T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
+						objectId, i, theChunk,
+						tags.objectId, tags.chunkId));
+				}
+			}
+		}
+
+	}
+
+}
+
+static void yaffs_VerifyDirectory(yaffs_Object *obj)
+{
+	if(obj && yaffs_SkipVerification(obj->myDev))
+		return;
+	
+}
+
+static void yaffs_VerifyHardLink(yaffs_Object *obj)
+{
+	if(obj && yaffs_SkipVerification(obj->myDev))
+		return;
+		
+	/* Verify sane equivalent object */
+}
+
+static void yaffs_VerifySymlink(yaffs_Object *obj)
+{
+	if(obj && yaffs_SkipVerification(obj->myDev))
+		return;
+		
+	/* Verify symlink string */
+}
+
+static void yaffs_VerifySpecial(yaffs_Object *obj)
+{
+	if(obj && yaffs_SkipVerification(obj->myDev))
+		return;
+}
+
+static void yaffs_VerifyObject(yaffs_Object *obj)
+{
+	yaffs_Device *dev;
+	
+	__u32 chunkMin;
+	__u32 chunkMax;
+	
+	__u32 chunkIdOk;
+	__u32 chunkIsLive;
+	
+	if(!obj)
+		return;
+	
+	dev = obj->myDev;
+	
+	if(yaffs_SkipVerification(dev))
+		return;
+		
+	/* Check sane object header chunk */
+	
+	chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
+	chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
+	
+	chunkIdOk = (obj->chunkId >= chunkMin && obj->chunkId <= chunkMax);
+	chunkIsLive = chunkIdOk && 
+			yaffs_CheckChunkBit(dev, 
+					    obj->chunkId / dev->nChunksPerBlock,
+					    obj->chunkId % dev->nChunksPerBlock);
+	if(!obj->fake && 
+	    (!chunkIdOk || !chunkIsLive)) {
+	   T(YAFFS_TRACE_VERIFY,
+	   (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
+	   obj->objectId,obj->chunkId,
+	   chunkIdOk ? "" : ",out of range",
+	   chunkIsLive || !chunkIdOk ? "" : ",marked as deleted"));
+	}
+	
+	if(chunkIdOk && chunkIsLive &&!yaffs_SkipNANDVerification(dev)) {
+		yaffs_ExtendedTags tags;
+		yaffs_ObjectHeader *oh;
+		__u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
+		
+		oh = (yaffs_ObjectHeader *)buffer;
+		
+		yaffs_ReadChunkWithTagsFromNAND(dev, obj->chunkId,buffer, &tags);
+		
+		yaffs_VerifyObjectHeader(obj,oh,&tags,1);
+		
+		yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
+	}
+	
+	/* Verify it has a parent */
+	if(obj && !obj->fake &&
+	   (!obj->parent || obj->parent->myDev != dev)){
+	   T(YAFFS_TRACE_VERIFY,
+	   (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
+	   obj->objectId,obj->parent));	   
+	}
+	
+	/* Verify parent is a directory */
+	if(obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY){
+	   T(YAFFS_TRACE_VERIFY,
+	   (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
+	   obj->objectId,obj->parent->variantType));	   
+	}
+	
+	switch(obj->variantType){
+	case YAFFS_OBJECT_TYPE_FILE:
+		yaffs_VerifyFile(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		yaffs_VerifySymlink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		yaffs_VerifyDirectory(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		yaffs_VerifyHardLink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		yaffs_VerifySpecial(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+	default:
+		T(YAFFS_TRACE_VERIFY,
+		(TSTR("Obj %d has illegaltype %d"TENDSTR),
+		obj->objectId,obj->variantType));	   
+		break;
+	}
+	
+	
+}
+
+static void yaffs_VerifyObjects(yaffs_Device *dev)
+{
+	yaffs_Object *obj;
+	int i;
+	struct list_head *lh;
+
+	if(yaffs_SkipVerification(dev))
+		return;
+	
+	/* Iterate through the objects in each hash entry */
+	 
+	 for(i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++){
+	 	list_for_each(lh, &dev->objectBucket[i].list) {
+			if (lh) {
+				obj = list_entry(lh, yaffs_Object, hashLink);
+				yaffs_VerifyObject(obj);
+			}
+		}
+	 }
+
+}
+
+
+/*
+ *  Simple hash function. Needs to have a reasonable spread
+ */
+ 
+static Y_INLINE int yaffs_HashFunction(int n)
+{
+/* XXX U-BOOT XXX */
+	/*n = abs(n); */
+	if (n < 0)
+		n = -n;
+	return (n % YAFFS_NOBJECT_BUCKETS);
+}
+
+/*
+ * Access functions to useful fake objects
+ */
+ 
+yaffs_Object *yaffs_Root(yaffs_Device * dev)
+{
+	return dev->rootDir;
+}
+
+yaffs_Object *yaffs_LostNFound(yaffs_Device * dev)
+{
+	return dev->lostNFoundDir;
+}
+
+
+/*
+ *  Erased NAND checking functions
+ */
+ 
+int yaffs_CheckFF(__u8 * buffer, int nBytes)
+{
+	/* Horrible, slow implementation */
+	while (nBytes--) {
+		if (*buffer != 0xFF)
+			return 0;
+		buffer++;
+	}
+	return 1;
+}
+
+static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
+				  int chunkInNAND)
+{
+
+	int retval = YAFFS_OK;
+	__u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
+	yaffs_ExtendedTags tags;
+	int result;
+
+	result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
+	
+	if(tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
+		retval = YAFFS_FAIL;
+		
+
+	if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
+		T(YAFFS_TRACE_NANDACCESS,
+		  (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
+		retval = YAFFS_FAIL;
+	}
+
+	yaffs_ReleaseTempBuffer(dev, data, __LINE__);
+
+	return retval;
+
+}
+
+static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
+					     const __u8 * data,
+					     yaffs_ExtendedTags * tags,
+					     int useReserve)
+{
+	int attempts = 0;
+	int writeOk = 0;
+	int chunk;
+
+	yaffs_InvalidateCheckpoint(dev);
+
+	do {
+		yaffs_BlockInfo *bi = 0;
+		int erasedOk = 0;
+
+		chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
+		if (chunk < 0) {
+			/* no space */
+			break;
+		}
+
+		/* First check this chunk is erased, if it needs
+		 * checking.  The checking policy (unless forced
+		 * always on) is as follows:
+		 *
+		 * Check the first page we try to write in a block.
+		 * If the check passes then we don't need to check any
+		 * more.	If the check fails, we check again...
+		 * If the block has been erased, we don't need to check.
+		 *
+		 * However, if the block has been prioritised for gc,
+		 * then we think there might be something odd about
+		 * this block and stop using it.
+		 *
+		 * Rationale: We should only ever see chunks that have
+		 * not been erased if there was a partially written
+		 * chunk due to power loss.  This checking policy should
+		 * catch that case with very few checks and thus save a
+		 * lot of checks that are most likely not needed.
+		 */
+		if (bi->gcPrioritise) {
+			yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
+			/* try another chunk */
+			continue;
+		}
+
+		/* let's give it a try */
+		attempts++;
+
+#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
+		bi->skipErasedCheck = 0;
+#endif
+		if (!bi->skipErasedCheck) {
+			erasedOk = yaffs_CheckChunkErased(dev, chunk);
+			if (erasedOk != YAFFS_OK) {
+				T(YAFFS_TRACE_ERROR,
+				(TSTR ("**>> yaffs chunk %d was not erased"
+				TENDSTR), chunk));
+
+				/* try another chunk */
+				continue;
+			}
+			bi->skipErasedCheck = 1;
+		}
+
+		writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
+				data, tags);
+		if (writeOk != YAFFS_OK) {
+			yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
+			/* try another chunk */
+			continue;
+		}
+
+		/* Copy the data into the robustification buffer */
+		yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
+
+	} while (writeOk != YAFFS_OK && 
+	        (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
+	
+	if(!writeOk)
+		chunk = -1;
+
+	if (attempts > 1) {
+		T(YAFFS_TRACE_ERROR,
+			(TSTR("**>> yaffs write required %d attempts" TENDSTR),
+			attempts));
+
+		dev->nRetriedWrites += (attempts - 1);
+	}
+
+	return chunk;
+}
+
+/*
+ * Block retiring for handling a broken block.
+ */
+ 
+static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
+{
+	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
+
+	yaffs_InvalidateCheckpoint(dev);
+	
+	yaffs_MarkBlockBad(dev, blockInNAND);
+
+	bi->blockState = YAFFS_BLOCK_STATE_DEAD;
+	bi->gcPrioritise = 0;
+	bi->needsRetiring = 0;
+
+	dev->nRetiredBlocks++;
+}
+
+/*
+ * Functions for robustisizing TODO
+ *
+ */
+ 
+static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
+				     const __u8 * data,
+				     const yaffs_ExtendedTags * tags)
+{
+}
+
+static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
+				    const yaffs_ExtendedTags * tags)
+{
+}
+
+void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
+{
+	if(!bi->gcPrioritise){
+		bi->gcPrioritise = 1;
+		dev->hasPendingPrioritisedGCs = 1;
+		bi->chunkErrorStrikes ++;
+		
+		if(bi->chunkErrorStrikes > 3){
+			bi->needsRetiring = 1; /* Too many stikes, so retire this */
+			T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
+
+		}
+		
+	}
+}
+
+static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk)
+{
+
+	int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
+	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
+
+	yaffs_HandleChunkError(dev,bi);
+		
+	
+	if(erasedOk ) {
+		/* Was an actual write failure, so mark the block for retirement  */
+		bi->needsRetiring = 1;
+		T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+		  (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
+
+		
+	}
+	
+	/* Delete the chunk */
+	yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
+}
+
+
+/*---------------- Name handling functions ------------*/ 
+
+static __u16 yaffs_CalcNameSum(const YCHAR * name)
+{
+	__u16 sum = 0;
+	__u16 i = 1;
+
+	YUCHAR *bname = (YUCHAR *) name;
+	if (bname) {
+		while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
+
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+			sum += yaffs_toupper(*bname) * i;
+#else
+			sum += (*bname) * i;
+#endif
+			i++;
+			bname++;
+		}
+	}
+	return sum;
+}
+
+static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
+{
+#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
+	if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
+		yaffs_strcpy(obj->shortName, name);
+	} else {
+		obj->shortName[0] = _Y('\0');
+	}
+#endif
+	obj->sum = yaffs_CalcNameSum(name);
+}
+
+/*-------------------- TNODES -------------------
+
+ * List of spare tnodes
+ * The list is hooked together using the first pointer
+ * in the tnode.
+ */
+ 
+/* yaffs_CreateTnodes creates a bunch more tnodes and
+ * adds them to the tnode free list.
+ * Don't use this function directly
+ */
+
+static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
+{
+	int i;
+	int tnodeSize;
+	yaffs_Tnode *newTnodes;
+	__u8 *mem;
+	yaffs_Tnode *curr;
+	yaffs_Tnode *next;
+	yaffs_TnodeList *tnl;
+
+	if (nTnodes < 1)
+		return YAFFS_OK;
+		
+	/* Calculate the tnode size in bytes for variable width tnode support.
+	 * Must be a multiple of 32-bits  */
+	tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
+
+	/* make these things */
+
+	newTnodes = YMALLOC(nTnodes * tnodeSize);
+	mem = (__u8 *)newTnodes;
+
+	if (!newTnodes) {
+		T(YAFFS_TRACE_ERROR,
+		  (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	/* Hook them into the free list */
+#if 0
+	for (i = 0; i < nTnodes - 1; i++) {
+		newTnodes[i].internal[0] = &newTnodes[i + 1];
+#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
+		newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
+#endif
+	}
+
+	newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
+#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
+	newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
+#endif
+	dev->freeTnodes = newTnodes;
+#else
+	/* New hookup for wide tnodes */
+	for(i = 0; i < nTnodes -1; i++) {
+		curr = (yaffs_Tnode *) &mem[i * tnodeSize];
+		next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
+		curr->internal[0] = next;
+	}
+	
+	curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
+	curr->internal[0] = dev->freeTnodes;
+	dev->freeTnodes = (yaffs_Tnode *)mem;
+
+#endif
+
+
+	dev->nFreeTnodes += nTnodes;
+	dev->nTnodesCreated += nTnodes;
+
+	/* Now add this bunch of tnodes to a list for freeing up.
+	 * NB If we can't add this to the management list it isn't fatal
+	 * but it just means we can't free this bunch of tnodes later.
+	 */
+	 
+	tnl = YMALLOC(sizeof(yaffs_TnodeList));
+	if (!tnl) {
+		T(YAFFS_TRACE_ERROR,
+		  (TSTR
+		   ("yaffs: Could not add tnodes to management list" TENDSTR)));
+		   return YAFFS_FAIL;
+
+	} else {
+		tnl->tnodes = newTnodes;
+		tnl->next = dev->allocatedTnodeList;
+		dev->allocatedTnodeList = tnl;
+	}
+
+	T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
+
+	return YAFFS_OK;
+}
+
+/* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
+
+static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device * dev)
+{
+	yaffs_Tnode *tn = NULL;
+
+	/* If there are none left make more */
+	if (!dev->freeTnodes) {
+		yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
+	}
+
+	if (dev->freeTnodes) {
+		tn = dev->freeTnodes;
+#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
+		if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
+			/* Hoosterman, this thing looks like it isn't in the list */
+			T(YAFFS_TRACE_ALWAYS,
+			  (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
+		}
+#endif
+		dev->freeTnodes = dev->freeTnodes->internal[0];
+		dev->nFreeTnodes--;
+	}
+
+	return tn;
+}
+
+static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
+{
+	yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
+	
+	if(tn)
+		memset(tn, 0, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
+
+	return tn;	
+}
+
+/* FreeTnode frees up a tnode and puts it back on the free list */
+static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
+{
+	if (tn) {
+#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
+		if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
+			/* Hoosterman, this thing looks like it is already in the list */
+			T(YAFFS_TRACE_ALWAYS,
+			  (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
+		}
+		tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
+#endif
+		tn->internal[0] = dev->freeTnodes;
+		dev->freeTnodes = tn;
+		dev->nFreeTnodes++;
+	}
+}
+
+static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
+{
+	/* Free the list of allocated tnodes */
+	yaffs_TnodeList *tmp;
+
+	while (dev->allocatedTnodeList) {
+		tmp = dev->allocatedTnodeList->next;
+
+		YFREE(dev->allocatedTnodeList->tnodes);
+		YFREE(dev->allocatedTnodeList);
+		dev->allocatedTnodeList = tmp;
+
+	}
+
+	dev->freeTnodes = NULL;
+	dev->nFreeTnodes = 0;
+}
+
+static void yaffs_InitialiseTnodes(yaffs_Device * dev)
+{
+	dev->allocatedTnodeList = NULL;
+	dev->freeTnodes = NULL;
+	dev->nFreeTnodes = 0;
+	dev->nTnodesCreated = 0;
+
+}
+
+
+void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, unsigned val)
+{
+  __u32 *map = (__u32 *)tn;
+  __u32 bitInMap;
+  __u32 bitInWord;
+  __u32 wordInMap;
+  __u32 mask;
+  
+  pos &= YAFFS_TNODES_LEVEL0_MASK;
+  val >>= dev->chunkGroupBits;
+  
+  bitInMap = pos * dev->tnodeWidth;
+  wordInMap = bitInMap /32;
+  bitInWord = bitInMap & (32 -1);
+  
+  mask = dev->tnodeMask << bitInWord;
+  
+  map[wordInMap] &= ~mask;
+  map[wordInMap] |= (mask & (val << bitInWord));
+  
+  if(dev->tnodeWidth > (32-bitInWord)) {
+    bitInWord = (32 - bitInWord);
+    wordInMap++;;
+    mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
+    map[wordInMap] &= ~mask;
+    map[wordInMap] |= (mask & (val >> bitInWord));
+  }
+}
+
+static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos)
+{
+  __u32 *map = (__u32 *)tn;
+  __u32 bitInMap;
+  __u32 bitInWord;
+  __u32 wordInMap;
+  __u32 val;
+  
+  pos &= YAFFS_TNODES_LEVEL0_MASK;
+  
+  bitInMap = pos * dev->tnodeWidth;
+  wordInMap = bitInMap /32;
+  bitInWord = bitInMap & (32 -1);
+  
+  val = map[wordInMap] >> bitInWord;
+  
+  if(dev->tnodeWidth > (32-bitInWord)) {
+    bitInWord = (32 - bitInWord);
+    wordInMap++;;
+    val |= (map[wordInMap] << bitInWord);
+  }
+  
+  val &= dev->tnodeMask;
+  val <<= dev->chunkGroupBits;
+  
+  return val;
+}
+
+/* ------------------- End of individual tnode manipulation -----------------*/
+
+/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
+ * The look up tree is represented by the top tnode and the number of topLevel
+ * in the tree. 0 means only the level 0 tnode is in the tree.
+ */
+
+/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
+static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
+					  yaffs_FileStructure * fStruct,
+					  __u32 chunkId)
+{
+
+	yaffs_Tnode *tn = fStruct->top;
+	__u32 i;
+	int requiredTallness;
+	int level = fStruct->topLevel;
+
+	/* Check sane level and chunk Id */
+	if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
+		return NULL;
+	}
+
+	if (chunkId > YAFFS_MAX_CHUNK_ID) {
+		return NULL;
+	}
+
+	/* First check we're tall enough (ie enough topLevel) */
+
+	i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
+	requiredTallness = 0;
+	while (i) {
+		i >>= YAFFS_TNODES_INTERNAL_BITS;
+		requiredTallness++;
+	}
+
+	if (requiredTallness > fStruct->topLevel) {
+		/* Not tall enough, so we can't find it, return NULL. */
+		return NULL;
+	}
+
+	/* Traverse down to level 0 */
+	while (level > 0 && tn) {
+		tn = tn->
+		    internal[(chunkId >>
+			       ( YAFFS_TNODES_LEVEL0_BITS + 
+			         (level - 1) *
+			         YAFFS_TNODES_INTERNAL_BITS)
+			      ) &
+			     YAFFS_TNODES_INTERNAL_MASK];
+		level--;
+
+	}
+
+	return tn;
+}
+
+/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
+ * This happens in two steps:
+ *  1. If the tree isn't tall enough, then make it taller.
+ *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
+ *
+ * Used when modifying the tree.
+ *
+ *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
+ *  be plugged into the ttree.
+ */
+ 
+static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
+					       yaffs_FileStructure * fStruct,
+					       __u32 chunkId,
+					       yaffs_Tnode *passedTn)
+{
+
+	int requiredTallness;
+	int i;
+	int l;
+	yaffs_Tnode *tn;
+
+	__u32 x;
+
+
+	/* Check sane level and page Id */
+	if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
+		return NULL;
+	}
+
+	if (chunkId > YAFFS_MAX_CHUNK_ID) {
+		return NULL;
+	}
+
+	/* First check we're tall enough (ie enough topLevel) */
+
+	x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
+	requiredTallness = 0;
+	while (x) {
+		x >>= YAFFS_TNODES_INTERNAL_BITS;
+		requiredTallness++;
+	}
+
+
+	if (requiredTallness > fStruct->topLevel) {
+		/* Not tall enough,gotta make the tree taller */
+		for (i = fStruct->topLevel; i < requiredTallness; i++) {
+		
+			tn = yaffs_GetTnode(dev);
+
+			if (tn) {
+				tn->internal[0] = fStruct->top;
+				fStruct->top = tn;
+			} else {
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR("yaffs: no more tnodes" TENDSTR)));
+			}
+		}
+
+		fStruct->topLevel = requiredTallness;
+	}
+
+	/* Traverse down to level 0, adding anything we need */
+
+	l = fStruct->topLevel;
+	tn = fStruct->top;
+	
+	if(l > 0) {
+		while (l > 0 && tn) {
+			x = (chunkId >>
+			     ( YAFFS_TNODES_LEVEL0_BITS +
+			      (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
+			    YAFFS_TNODES_INTERNAL_MASK;
+
+
+			if((l>1) && !tn->internal[x]){
+				/* Add missing non-level-zero tnode */
+				tn->internal[x] = yaffs_GetTnode(dev);
+
+			} else if(l == 1) {
+				/* Looking from level 1 at level 0 */
+			 	if (passedTn) {
+					/* If we already have one, then release it.*/
+					if(tn->internal[x])
+						yaffs_FreeTnode(dev,tn->internal[x]);
+					tn->internal[x] = passedTn;
+			
+				} else if(!tn->internal[x]) {
+					/* Don't have one, none passed in */
+					tn->internal[x] = yaffs_GetTnode(dev);
+				}
+			}
+		
+			tn = tn->internal[x];
+			l--;
+		}
+	} else {
+		/* top is level 0 */
+		if(passedTn) {
+			memcpy(tn,passedTn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
+			yaffs_FreeTnode(dev,passedTn);
+		}
+	}
+
+	return tn;
+}
+
+static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
+				  yaffs_ExtendedTags * tags, int objectId,
+				  int chunkInInode)
+{
+	int j;
+
+	for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
+		if (yaffs_CheckChunkBit
+		    (dev, theChunk / dev->nChunksPerBlock,
+		     theChunk % dev->nChunksPerBlock)) {
+			yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
+							tags);
+			if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
+				/* found it; */
+				return theChunk;
+
+			}
+		}
+		theChunk++;
+	}
+	return -1;
+}
+
+
+/* DeleteWorker scans backwards through the tnode tree and deletes all the
+ * chunks and tnodes in the file
+ * Returns 1 if the tree was deleted. 
+ * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
+ */
+
+static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
+			      int chunkOffset, int *limit)
+{
+	int i;
+	int chunkInInode;
+	int theChunk;
+	yaffs_ExtendedTags tags;
+	int foundChunk;
+	yaffs_Device *dev = in->myDev;
+
+	int allDone = 1;
+
+	if (tn) {
+		if (level > 0) {
+
+			for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
+			     i--) {
+				if (tn->internal[i]) {
+					if (limit && (*limit) < 0) {
+						allDone = 0;
+					} else {
+						allDone =
+						    yaffs_DeleteWorker(in,
+								       tn->
+								       internal
+								       [i],
+								       level -
+								       1,
+								       (chunkOffset
+									<<
+									YAFFS_TNODES_INTERNAL_BITS)
+								       + i,
+								       limit);
+					}
+					if (allDone) {
+						yaffs_FreeTnode(dev,
+								tn->
+								internal[i]);
+						tn->internal[i] = NULL;
+					}
+				}
+
+			}
+			return (allDone) ? 1 : 0;
+		} else if (level == 0) {
+			int hitLimit = 0;
+
+			for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
+			     i--) {
+			        theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
+				if (theChunk) {
+
+					chunkInInode =
+					    (chunkOffset <<
+					     YAFFS_TNODES_LEVEL0_BITS) + i;
+
+					foundChunk =
+					    yaffs_FindChunkInGroup(dev,
+								   theChunk,
+								   &tags,
+								   in->objectId,
+								   chunkInInode);
+
+					if (foundChunk > 0) {
+						yaffs_DeleteChunk(dev,
+								  foundChunk, 1,
+								  __LINE__);
+						in->nDataChunks--;
+						if (limit) {
+							*limit = *limit - 1;
+							if (*limit <= 0) {
+								hitLimit = 1;
+							}
+						}
+
+					}
+
+					yaffs_PutLevel0Tnode(dev,tn,i,0);
+				}
+
+			}
+			return (i < 0) ? 1 : 0;
+
+		}
+
+	}
+
+	return 1;
+
+}
+
+static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
+{
+
+	yaffs_BlockInfo *theBlock;
+
+	T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
+
+	theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
+	if (theBlock) {
+		theBlock->softDeletions++;
+		dev->nFreeChunks++;
+	}
+}
+
+/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
+ * All soft deleting does is increment the block's softdelete count and pulls the chunk out
+ * of the tnode.
+ * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
+ */
+ 
+static int yaffs_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
+				  __u32 level, int chunkOffset)
+{
+	int i;
+	int theChunk;
+	int allDone = 1;
+	yaffs_Device *dev = in->myDev;
+
+	if (tn) {
+		if (level > 0) {
+
+			for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
+			     i--) {
+				if (tn->internal[i]) {
+					allDone =
+					    yaffs_SoftDeleteWorker(in,
+								   tn->
+								   internal[i],
+								   level - 1,
+								   (chunkOffset
+								    <<
+								    YAFFS_TNODES_INTERNAL_BITS)
+								   + i);
+					if (allDone) {
+						yaffs_FreeTnode(dev,
+								tn->
+								internal[i]);
+						tn->internal[i] = NULL;
+					} else {
+						/* Hoosterman... how could this happen? */
+					}
+				}
+			}
+			return (allDone) ? 1 : 0;
+		} else if (level == 0) {
+
+			for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
+				theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
+				if (theChunk) {
+					/* Note this does not find the real chunk, only the chunk group.
+					 * We make an assumption that a chunk group is not larger than 
+					 * a block.
+					 */
+					yaffs_SoftDeleteChunk(dev, theChunk);
+					yaffs_PutLevel0Tnode(dev,tn,i,0);
+				}
+
+			}
+			return 1;
+
+		}
+
+	}
+
+	return 1;
+
+}
+
+static void yaffs_SoftDeleteFile(yaffs_Object * obj)
+{
+	if (obj->deleted &&
+	    obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
+		if (obj->nDataChunks <= 0) {
+			/* Empty file with no duplicate object headers, just delete it immediately */
+			yaffs_FreeTnode(obj->myDev,
+					obj->variant.fileVariant.top);
+			obj->variant.fileVariant.top = NULL;
+			T(YAFFS_TRACE_TRACING,
+			  (TSTR("yaffs: Deleting empty file %d" TENDSTR),
+			   obj->objectId));
+			yaffs_DoGenericObjectDeletion(obj);
+		} else {
+			yaffs_SoftDeleteWorker(obj,
+					       obj->variant.fileVariant.top,
+					       obj->variant.fileVariant.
+					       topLevel, 0);
+			obj->softDeleted = 1;
+		}
+	}
+}
+
+/* Pruning removes any part of the file structure tree that is beyond the
+ * bounds of the file (ie that does not point to chunks).
+ *
+ * A file should only get pruned when its size is reduced.
+ *
+ * Before pruning, the chunks must be pulled from the tree and the
+ * level 0 tnode entries must be zeroed out.
+ * Could also use this for file deletion, but that's probably better handled
+ * by a special case.
+ */
+
+static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
+				      __u32 level, int del0)
+{
+	int i;
+	int hasData;
+
+	if (tn) {
+		hasData = 0;
+
+		for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
+			if (tn->internal[i] && level > 0) {
+				tn->internal[i] =
+				    yaffs_PruneWorker(dev, tn->internal[i],
+						      level - 1,
+						      (i == 0) ? del0 : 1);
+			}
+
+			if (tn->internal[i]) {
+				hasData++;
+			}
+		}
+
+		if (hasData == 0 && del0) {
+			/* Free and return NULL */
+
+			yaffs_FreeTnode(dev, tn);
+			tn = NULL;
+		}
+
+	}
+
+	return tn;
+
+}
+
+static int yaffs_PruneFileStructure(yaffs_Device * dev,
+				    yaffs_FileStructure * fStruct)
+{
+	int i;
+	int hasData;
+	int done = 0;
+	yaffs_Tnode *tn;
+
+	if (fStruct->topLevel > 0) {
+		fStruct->top =
+		    yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
+
+		/* Now we have a tree with all the non-zero branches NULL but the height
+		 * is the same as it was.
+		 * Let's see if we can trim internal tnodes to shorten the tree.
+		 * We can do this if only the 0th element in the tnode is in use 
+		 * (ie all the non-zero are NULL)
+		 */
+
+		while (fStruct->topLevel && !done) {
+			tn = fStruct->top;
+
+			hasData = 0;
+			for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
+				if (tn->internal[i]) {
+					hasData++;
+				}
+			}
+
+			if (!hasData) {
+				fStruct->top = tn->internal[0];
+				fStruct->topLevel--;
+				yaffs_FreeTnode(dev, tn);
+			} else {
+				done = 1;
+			}
+		}
+	}
+
+	return YAFFS_OK;
+}
+
+/*-------------------- End of File Structure functions.-------------------*/
+
+/* yaffs_CreateFreeObjects creates a bunch more objects and
+ * adds them to the object free list.
+ */
+static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
+{
+	int i;
+	yaffs_Object *newObjects;
+	yaffs_ObjectList *list;
+
+	if (nObjects < 1)
+		return YAFFS_OK;
+
+	/* make these things */
+	newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
+	list = YMALLOC(sizeof(yaffs_ObjectList));
+
+	if (!newObjects || !list) {
+		if(newObjects)
+			YFREE(newObjects);
+		if(list)
+			YFREE(list);
+		T(YAFFS_TRACE_ALLOCATE,
+		  (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+	
+	/* Hook them into the free list */
+	for (i = 0; i < nObjects - 1; i++) {
+		newObjects[i].siblings.next =
+		    (struct list_head *)(&newObjects[i + 1]);
+	}
+
+	newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
+	dev->freeObjects = newObjects;
+	dev->nFreeObjects += nObjects;
+	dev->nObjectsCreated += nObjects;
+
+	/* Now add this bunch of Objects to a list for freeing up. */
+
+	list->objects = newObjects;
+	list->next = dev->allocatedObjectList;
+	dev->allocatedObjectList = list;
+
+	return YAFFS_OK;
+}
+
+
+/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
+static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
+{
+	yaffs_Object *tn = NULL;
+
+	/* If there are none left make more */
+	if (!dev->freeObjects) {
+		yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
+	}
+
+	if (dev->freeObjects) {
+		tn = dev->freeObjects;
+		dev->freeObjects =
+		    (yaffs_Object *) (dev->freeObjects->siblings.next);
+		dev->nFreeObjects--;
+
+		/* Now sweeten it up... */
+
+		memset(tn, 0, sizeof(yaffs_Object));
+		tn->myDev = dev;
+		tn->chunkId = -1;
+		tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
+		INIT_LIST_HEAD(&(tn->hardLinks));
+		INIT_LIST_HEAD(&(tn->hashLink));
+		INIT_LIST_HEAD(&tn->siblings);
+
+		/* Add it to the lost and found directory.
+		 * NB Can't put root or lostNFound in lostNFound so
+		 * check if lostNFound exists first
+		 */
+		if (dev->lostNFoundDir) {
+			yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
+		}
+	}
+
+	return tn;
+}
+
+static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
+					       __u32 mode)
+{
+
+	yaffs_Object *obj =
+	    yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
+	if (obj) {
+		obj->fake = 1;		/* it is fake so it has no NAND presence... */
+		obj->renameAllowed = 0;	/* ... and we're not allowed to rename it... */
+		obj->unlinkAllowed = 0;	/* ... or unlink it */
+		obj->deleted = 0;
+		obj->unlinked = 0;
+		obj->yst_mode = mode;
+		obj->myDev = dev;
+		obj->chunkId = 0;	/* Not a valid chunk. */
+	}
+
+	return obj;
+
+}
+
+static void yaffs_UnhashObject(yaffs_Object * tn)
+{
+	int bucket;
+	yaffs_Device *dev = tn->myDev;
+
+	/* If it is still linked into the bucket list, free from the list */
+	if (!list_empty(&tn->hashLink)) {
+		list_del_init(&tn->hashLink);
+		bucket = yaffs_HashFunction(tn->objectId);
+		dev->objectBucket[bucket].count--;
+	}
+
+}
+
+/*  FreeObject frees up a Object and puts it back on the free list */
+static void yaffs_FreeObject(yaffs_Object * tn)
+{
+
+	yaffs_Device *dev = tn->myDev;
+
+/* XXX U-BOOT XXX */
+#if 0
+#ifdef  __KERNEL__
+	if (tn->myInode) {
+		/* We're still hooked up to a cached inode.
+		 * Don't delete now, but mark for later deletion
+		 */
+		tn->deferedFree = 1;
+		return;
+	}
+#endif
+#endif
+	yaffs_UnhashObject(tn);
+
+	/* Link into the free list. */
+	tn->siblings.next = (struct list_head *)(dev->freeObjects);
+	dev->freeObjects = tn;
+	dev->nFreeObjects++;
+}
+
+/* XXX U-BOOT XXX */
+#if 0
+#ifdef __KERNEL__
+
+void yaffs_HandleDeferedFree(yaffs_Object * obj)
+{
+	if (obj->deferedFree) {
+		yaffs_FreeObject(obj);
+	}
+}
+
+#endif
+#endif
+
+static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
+{
+	/* Free the list of allocated Objects */
+
+	yaffs_ObjectList *tmp;
+
+	while (dev->allocatedObjectList) {
+		tmp = dev->allocatedObjectList->next;
+		YFREE(dev->allocatedObjectList->objects);
+		YFREE(dev->allocatedObjectList);
+
+		dev->allocatedObjectList = tmp;
+	}
+
+	dev->freeObjects = NULL;
+	dev->nFreeObjects = 0;
+}
+
+static void yaffs_InitialiseObjects(yaffs_Device * dev)
+{
+	int i;
+
+	dev->allocatedObjectList = NULL;
+	dev->freeObjects = NULL;
+	dev->nFreeObjects = 0;
+
+	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+		INIT_LIST_HEAD(&dev->objectBucket[i].list);
+		dev->objectBucket[i].count = 0;
+	}
+
+}
+
+static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
+{
+	static int x = 0;
+	int i;
+	int l = 999;
+	int lowest = 999999;
+
+	/* First let's see if we can find one that's empty. */
+
+	for (i = 0; i < 10 && lowest > 0; i++) {
+		x++;
+		x %= YAFFS_NOBJECT_BUCKETS;
+		if (dev->objectBucket[x].count < lowest) {
+			lowest = dev->objectBucket[x].count;
+			l = x;
+		}
+
+	}
+
+	/* If we didn't find an empty list, then try
+	 * looking a bit further for a short one
+	 */
+
+	for (i = 0; i < 10 && lowest > 3; i++) {
+		x++;
+		x %= YAFFS_NOBJECT_BUCKETS;
+		if (dev->objectBucket[x].count < lowest) {
+			lowest = dev->objectBucket[x].count;
+			l = x;
+		}
+
+	}
+
+	return l;
+}
+
+static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
+{
+	int bucket = yaffs_FindNiceObjectBucket(dev);
+
+	/* Now find an object value that has not already been taken
+	 * by scanning the list.
+	 */
+
+	int found = 0;
+	struct list_head *i;
+
+	__u32 n = (__u32) bucket;
+
+	/* yaffs_CheckObjectHashSanity();  */
+
+	while (!found) {
+		found = 1;
+		n += YAFFS_NOBJECT_BUCKETS;
+		if (1 || dev->objectBucket[bucket].count > 0) {
+			list_for_each(i, &dev->objectBucket[bucket].list) {
+				/* If there is already one in the list */
+				if (i
+				    && list_entry(i, yaffs_Object,
+						  hashLink)->objectId == n) {
+					found = 0;
+				}
+			}
+		}
+	}
+
+
+	return n;
+}
+
+static void yaffs_HashObject(yaffs_Object * in)
+{
+	int bucket = yaffs_HashFunction(in->objectId);
+	yaffs_Device *dev = in->myDev;
+
+	list_add(&in->hashLink, &dev->objectBucket[bucket].list);
+	dev->objectBucket[bucket].count++;
+
+}
+
+yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
+{
+	int bucket = yaffs_HashFunction(number);
+	struct list_head *i;
+	yaffs_Object *in;
+
+	list_for_each(i, &dev->objectBucket[bucket].list) {
+		/* Look if it is in the list */
+		if (i) {
+			in = list_entry(i, yaffs_Object, hashLink);
+			if (in->objectId == number) {
+/* XXX U-BOOT XXX */
+#if 0
+#ifdef __KERNEL__
+				/* Don't tell the VFS about this one if it is defered free */
+				if (in->deferedFree)
+					return NULL;
+#endif
+#endif
+				return in;
+			}
+		}
+	}
+
+	return NULL;
+}
+
+yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
+				    yaffs_ObjectType type)
+{
+
+	yaffs_Object *theObject;
+	yaffs_Tnode *tn;
+
+	if (number < 0) {
+		number = yaffs_CreateNewObjectNumber(dev);
+	}
+
+	theObject = yaffs_AllocateEmptyObject(dev);
+	if(!theObject)
+		return NULL;
+		
+	if(type == YAFFS_OBJECT_TYPE_FILE){
+		tn = yaffs_GetTnode(dev);
+		if(!tn){
+			yaffs_FreeObject(theObject);
+			return NULL;
+		}
+	}
+		
+	
+
+	if (theObject) {
+		theObject->fake = 0;
+		theObject->renameAllowed = 1;
+		theObject->unlinkAllowed = 1;
+		theObject->objectId = number;
+		yaffs_HashObject(theObject);
+		theObject->variantType = type;
+#ifdef CONFIG_YAFFS_WINCE
+		yfsd_WinFileTimeNow(theObject->win_atime);
+		theObject->win_ctime[0] = theObject->win_mtime[0] =
+		    theObject->win_atime[0];
+		theObject->win_ctime[1] = theObject->win_mtime[1] =
+		    theObject->win_atime[1];
+
+#else
+
+		theObject->yst_atime = theObject->yst_mtime =
+		    theObject->yst_ctime = Y_CURRENT_TIME;
+#endif
+		switch (type) {
+		case YAFFS_OBJECT_TYPE_FILE:
+			theObject->variant.fileVariant.fileSize = 0;
+			theObject->variant.fileVariant.scannedFileSize = 0;
+			theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF;	/* max __u32 */
+			theObject->variant.fileVariant.topLevel = 0;
+			theObject->variant.fileVariant.top = tn;
+			break;
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+			INIT_LIST_HEAD(&theObject->variant.directoryVariant.
+				       children);
+			break;
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+			/* No action required */
+			break;
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+			/* todo this should not happen */
+			break;
+		}
+	}
+
+	return theObject;
+}
+
+static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
+						      int number,
+						      yaffs_ObjectType type)
+{
+	yaffs_Object *theObject = NULL;
+
+	if (number > 0) {
+		theObject = yaffs_FindObjectByNumber(dev, number);
+	}
+
+	if (!theObject) {
+		theObject = yaffs_CreateNewObject(dev, number, type);
+	}
+
+	return theObject;
+
+}
+			
+
+static YCHAR *yaffs_CloneString(const YCHAR * str)
+{
+	YCHAR *newStr = NULL;
+
+	if (str && *str) {
+		newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
+		if(newStr)
+			yaffs_strcpy(newStr, str);
+	}
+
+	return newStr;
+
+}
+
+/*
+ * Mknod (create) a new object.
+ * equivalentObject only has meaning for a hard link;
+ * aliasString only has meaning for a sumlink.
+ * rdev only has meaning for devices (a subset of special objects)
+ */
+ 
+static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
+				       yaffs_Object * parent,
+				       const YCHAR * name,
+				       __u32 mode,
+				       __u32 uid,
+				       __u32 gid,
+				       yaffs_Object * equivalentObject,
+				       const YCHAR * aliasString, __u32 rdev)
+{
+	yaffs_Object *in;
+	YCHAR *str;
+
+	yaffs_Device *dev = parent->myDev;
+
+	/* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
+	if (yaffs_FindObjectByName(parent, name)) {
+		return NULL;
+	}
+
+	in = yaffs_CreateNewObject(dev, -1, type);
+	
+	if(type == YAFFS_OBJECT_TYPE_SYMLINK){
+		str = yaffs_CloneString(aliasString);
+		if(!str){
+			yaffs_FreeObject(in);
+			return NULL;
+		}
+	}
+	
+	
+
+	if (in) {
+		in->chunkId = -1;
+		in->valid = 1;
+		in->variantType = type;
+
+		in->yst_mode = mode;
+
+#ifdef CONFIG_YAFFS_WINCE
+		yfsd_WinFileTimeNow(in->win_atime);
+		in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
+		in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
+
+#else
+		in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
+
+		in->yst_rdev = rdev;
+		in->yst_uid = uid;
+		in->yst_gid = gid;
+#endif
+		in->nDataChunks = 0;
+
+		yaffs_SetObjectName(in, name);
+		in->dirty = 1;
+
+		yaffs_AddObjectToDirectory(parent, in);
+
+		in->myDev = parent->myDev;
+
+		switch (type) {
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+			in->variant.symLinkVariant.alias = str;
+			break;
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+			in->variant.hardLinkVariant.equivalentObject =
+			    equivalentObject;
+			in->variant.hardLinkVariant.equivalentObjectId =
+			    equivalentObject->objectId;
+			list_add(&in->hardLinks, &equivalentObject->hardLinks);
+			break;
+		case YAFFS_OBJECT_TYPE_FILE:	
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+			/* do nothing */
+			break;
+		}
+
+		if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
+			/* Could not create the object header, fail the creation */
+			yaffs_DestroyObject(in);
+			in = NULL;
+		}
+
+	}
+
+	return in;
+}
+
+yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
+			      __u32 mode, __u32 uid, __u32 gid)
+{
+	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
+				 uid, gid, NULL, NULL, 0);
+}
+
+yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
+				   __u32 mode, __u32 uid, __u32 gid)
+{
+	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
+				 mode, uid, gid, NULL, NULL, 0);
+}
+
+yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
+				 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
+{
+	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
+				 uid, gid, NULL, NULL, rdev);
+}
+
+yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
+				 __u32 mode, __u32 uid, __u32 gid,
+				 const YCHAR * alias)
+{
+	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
+				 uid, gid, NULL, alias, 0);
+}
+
+/* yaffs_Link returns the object id of the equivalent object.*/
+yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
+			 yaffs_Object * equivalentObject)
+{
+	/* Get the real object in case we were fed a hard link as an equivalent object */
+	equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
+
+	if (yaffs_MknodObject
+	    (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
+	     equivalentObject, NULL, 0)) {
+		return equivalentObject;
+	} else {
+		return NULL;
+	}
+
+}
+
+static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
+				  const YCHAR * newName, int force, int shadows)
+{
+	int unlinkOp;
+	int deleteOp;
+
+	yaffs_Object *existingTarget;
+
+	if (newDir == NULL) {
+		newDir = obj->parent;	/* use the old directory */
+	}
+
+	if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
+		    TENDSTR)));
+		YBUG();
+	}
+	
+	/* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
+	if (obj->myDev->isYaffs2) {
+		unlinkOp = (newDir == obj->myDev->unlinkedDir);
+	} else {
+		unlinkOp = (newDir == obj->myDev->unlinkedDir
+			    && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
+	}
+
+	deleteOp = (newDir == obj->myDev->deletedDir);
+
+	existingTarget = yaffs_FindObjectByName(newDir, newName);
+
+	/* If the object is a file going into the unlinked directory, 
+	 *   then it is OK to just stuff it in since duplicate names are allowed.
+	 *   else only proceed if the new name does not exist and if we're putting 
+	 *   it into a directory.
+	 */
+	if ((unlinkOp ||
+	     deleteOp ||
+	     force ||
+	     (shadows > 0) ||
+	     !existingTarget) &&
+	    newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_SetObjectName(obj, newName);
+		obj->dirty = 1;
+
+		yaffs_AddObjectToDirectory(newDir, obj);
+
+		if (unlinkOp)
+			obj->unlinked = 1;
+
+		/* If it is a deletion then we mark it as a shrink for gc purposes. */
+		if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
+			return YAFFS_OK;
+	}
+
+	return YAFFS_FAIL;
+}
+
+int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
+		       yaffs_Object * newDir, const YCHAR * newName)
+{
+	yaffs_Object *obj;
+	yaffs_Object *existingTarget;
+	int force = 0;
+
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+	/* Special case for case insemsitive systems (eg. WinCE).
+	 * While look-up is case insensitive, the name isn't.
+	 * Therefore we might want to change x.txt to X.txt
+	*/
+	if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
+		force = 1;
+	}
+#endif
+
+	obj = yaffs_FindObjectByName(oldDir, oldName);
+	/* Check new name to long. */
+	if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK &&
+	    yaffs_strlen(newName) > YAFFS_MAX_ALIAS_LENGTH)
+	  /* ENAMETOOLONG */
+	  return YAFFS_FAIL;
+	else if (obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK &&
+		 yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
+	  /* ENAMETOOLONG */
+	  return YAFFS_FAIL;
+
+	if (obj && obj->renameAllowed) {
+
+		/* Now do the handling for an existing target, if there is one */
+
+		existingTarget = yaffs_FindObjectByName(newDir, newName);
+		if (existingTarget &&
+		    existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
+		    !list_empty(&existingTarget->variant.directoryVariant.children)) {
+			/* There is a target that is a non-empty directory, so we fail */
+			return YAFFS_FAIL;	/* EEXIST or ENOTEMPTY */
+		} else if (existingTarget && existingTarget != obj) {
+			/* Nuke the target first, using shadowing, 
+			 * but only if it isn't the same object
+			 */
+			yaffs_ChangeObjectName(obj, newDir, newName, force,
+					       existingTarget->objectId);
+			yaffs_UnlinkObject(existingTarget);
+		}
+
+		return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
+	}
+	return YAFFS_FAIL;
+}
+
+/*------------------------- Block Management and Page Allocation ----------------*/
+
+static int yaffs_InitialiseBlocks(yaffs_Device * dev)
+{
+	int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
+	
+	dev->blockInfo = NULL;
+	dev->chunkBits = NULL;
+	
+	dev->allocationBlock = -1;	/* force it to get a new one */
+
+	/* If the first allocation strategy fails, thry the alternate one */
+	dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
+	if(!dev->blockInfo){
+		dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
+		dev->blockInfoAlt = 1;
+	}
+	else
+		dev->blockInfoAlt = 0;
+		
+	if(dev->blockInfo){
+	
+		/* Set up dynamic blockinfo stuff. */
+		dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
+		dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
+		if(!dev->chunkBits){
+			dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
+			dev->chunkBitsAlt = 1;
+		}
+		else
+			dev->chunkBitsAlt = 0;
+	}
+	
+	if (dev->blockInfo && dev->chunkBits) {
+		memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
+		memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
+		return YAFFS_OK;
+	}
+
+	return YAFFS_FAIL;
+
+}
+
+static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
+{
+	if(dev->blockInfoAlt && dev->blockInfo)
+		YFREE_ALT(dev->blockInfo);
+	else if(dev->blockInfo)
+		YFREE(dev->blockInfo);
+
+	dev->blockInfoAlt = 0;
+
+	dev->blockInfo = NULL;
+	
+	if(dev->chunkBitsAlt && dev->chunkBits)
+		YFREE_ALT(dev->chunkBits);
+	else if(dev->chunkBits)
+		YFREE(dev->chunkBits);
+	dev->chunkBitsAlt = 0;
+	dev->chunkBits = NULL;
+}
+
+static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
+					    yaffs_BlockInfo * bi)
+{
+	int i;
+	__u32 seq;
+	yaffs_BlockInfo *b;
+
+	if (!dev->isYaffs2)
+		return 1;	/* disqualification only applies to yaffs2. */
+
+	if (!bi->hasShrinkHeader)
+		return 1;	/* can gc */
+
+	/* Find the oldest dirty sequence number if we don't know it and save it
+	 * so we don't have to keep recomputing it.
+	 */
+	if (!dev->oldestDirtySequence) {
+		seq = dev->sequenceNumber;
+
+		for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
+		     i++) {
+			b = yaffs_GetBlockInfo(dev, i);
+			if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
+			    (b->pagesInUse - b->softDeletions) <
+			    dev->nChunksPerBlock && b->sequenceNumber < seq) {
+				seq = b->sequenceNumber;
+			}
+		}
+		dev->oldestDirtySequence = seq;
+	}
+
+	/* Can't do gc of this block if there are any blocks older than this one that have
+	 * discarded pages.
+	 */
+	return (bi->sequenceNumber <= dev->oldestDirtySequence);
+
+}
+
+/* FindDiretiestBlock is used to select the dirtiest block (or close enough)
+ * for garbage collection.
+ */
+
+static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
+					       int aggressive)
+{
+
+	int b = dev->currentDirtyChecker;
+
+	int i;
+	int iterations;
+	int dirtiest = -1;
+	int pagesInUse = 0;
+	int prioritised=0;
+	yaffs_BlockInfo *bi;
+	int pendingPrioritisedExist = 0;
+	
+	/* First let's see if we need to grab a prioritised block */
+	if(dev->hasPendingPrioritisedGCs){
+		for(i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++){
+
+			bi = yaffs_GetBlockInfo(dev, i);
+			//yaffs_VerifyBlock(dev,bi,i);
+			
+			if(bi->gcPrioritise) {
+				pendingPrioritisedExist = 1;
+				if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
+				   yaffs_BlockNotDisqualifiedFromGC(dev, bi)){
+					pagesInUse = (bi->pagesInUse - bi->softDeletions);
+					dirtiest = i;
+					prioritised = 1;
+					aggressive = 1; /* Fool the non-aggressive skip logiv below */
+				}
+			}
+		}
+		
+		if(!pendingPrioritisedExist) /* None found, so we can clear this */
+			dev->hasPendingPrioritisedGCs = 0;
+	}
+
+	/* If we're doing aggressive GC then we are happy to take a less-dirty block, and
+	 * search harder.
+	 * else (we're doing a leasurely gc), then we only bother to do this if the
+	 * block has only a few pages in use.
+	 */
+
+	dev->nonAggressiveSkip--;
+
+	if (!aggressive && (dev->nonAggressiveSkip > 0)) {
+		return -1;
+	}
+
+	if(!prioritised)
+		pagesInUse =
+	    		(aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
+
+	if (aggressive) {
+		iterations =
+		    dev->internalEndBlock - dev->internalStartBlock + 1;
+	} else {
+		iterations =
+		    dev->internalEndBlock - dev->internalStartBlock + 1;
+		iterations = iterations / 16;
+		if (iterations > 200) {
+			iterations = 200;
+		}
+	}
+
+	for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
+		b++;
+		if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
+			b = dev->internalStartBlock;
+		}
+
+		if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
+			T(YAFFS_TRACE_ERROR,
+			  (TSTR("**>> Block %d is not valid" TENDSTR), b));
+			YBUG();
+		}
+
+		bi = yaffs_GetBlockInfo(dev, b);
+
+#if 0
+		if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
+			dirtiest = b;
+			pagesInUse = 0;
+		}
+		else 
+#endif
+
+		if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
+		       (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
+		        yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
+			dirtiest = b;
+			pagesInUse = (bi->pagesInUse - bi->softDeletions);
+		}
+	}
+
+	dev->currentDirtyChecker = b;
+
+	if (dirtiest > 0) {
+		T(YAFFS_TRACE_GC,
+		  (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
+		   dev->nChunksPerBlock - pagesInUse,prioritised));
+	}
+
+	dev->oldestDirtySequence = 0;
+
+	if (dirtiest > 0) {
+		dev->nonAggressiveSkip = 4;
+	}
+
+	return dirtiest;
+}
+
+static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
+{
+	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
+
+	int erasedOk = 0;
+
+	/* If the block is still healthy erase it and mark as clean.
+	 * If the block has had a data failure, then retire it.
+	 */
+	 
+	T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
+		(TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
+		blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
+		
+	bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
+
+	if (!bi->needsRetiring) {
+		yaffs_InvalidateCheckpoint(dev);
+		erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
+		if (!erasedOk) {
+			dev->nErasureFailures++;
+			T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+			  (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
+		}
+	}
+
+	if (erasedOk && 
+	    ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
+		int i;
+		for (i = 0; i < dev->nChunksPerBlock; i++) {
+			if (!yaffs_CheckChunkErased
+			    (dev, blockNo * dev->nChunksPerBlock + i)) {
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR
+				   (">>Block %d erasure supposedly OK, but chunk %d not erased"
+				    TENDSTR), blockNo, i));
+			}
+		}
+	}
+
+	if (erasedOk) {
+		/* Clean it up... */
+		bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
+		dev->nErasedBlocks++;
+		bi->pagesInUse = 0;
+		bi->softDeletions = 0;
+		bi->hasShrinkHeader = 0;
+		bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
+		bi->gcPrioritise = 0;
+		yaffs_ClearChunkBits(dev, blockNo);
+
+		T(YAFFS_TRACE_ERASE,
+		  (TSTR("Erased block %d" TENDSTR), blockNo));
+	} else {
+		dev->nFreeChunks -= dev->nChunksPerBlock;	/* We lost a block of free space */
+
+		yaffs_RetireBlock(dev, blockNo);
+		T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+		  (TSTR("**>> Block %d retired" TENDSTR), blockNo));
+	}
+}
+
+static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
+{
+	int i;
+
+	yaffs_BlockInfo *bi;
+
+	if (dev->nErasedBlocks < 1) {
+		/* Hoosterman we've got a problem.
+		 * Can't get space to gc
+		 */
+		T(YAFFS_TRACE_ERROR,
+		  (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
+
+		return -1;
+	}
+	
+	/* Find an empty block. */
+
+	for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
+		dev->allocationBlockFinder++;
+		if (dev->allocationBlockFinder < dev->internalStartBlock
+		    || dev->allocationBlockFinder > dev->internalEndBlock) {
+			dev->allocationBlockFinder = dev->internalStartBlock;
+		}
+
+		bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
+
+		if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
+			bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
+			dev->sequenceNumber++;
+			bi->sequenceNumber = dev->sequenceNumber;
+			dev->nErasedBlocks--;
+			T(YAFFS_TRACE_ALLOCATE,
+			  (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
+			   dev->allocationBlockFinder, dev->sequenceNumber,
+			   dev->nErasedBlocks));
+			return dev->allocationBlockFinder;
+		}
+	}
+
+	T(YAFFS_TRACE_ALWAYS,
+	  (TSTR
+	   ("yaffs tragedy: no more eraased blocks, but there should have been %d"
+	    TENDSTR), dev->nErasedBlocks));
+
+	return -1;
+}
+
+
+// Check if there's space to allocate...
+// Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
+static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
+{
+	int reservedChunks;
+	int reservedBlocks = dev->nReservedBlocks;
+	int checkpointBlocks;
+	
+	checkpointBlocks =  dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
+	if(checkpointBlocks < 0)
+		checkpointBlocks = 0;
+	
+	reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
+	
+	return (dev->nFreeChunks > reservedChunks);
+}
+
+static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr)
+{
+	int retVal;
+	yaffs_BlockInfo *bi;
+
+	if (dev->allocationBlock < 0) {
+		/* Get next block to allocate off */
+		dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
+		dev->allocationPage = 0;
+	}
+
+	if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
+		/* Not enough space to allocate unless we're allowed to use the reserve. */
+		return -1;
+	}
+
+	if (dev->nErasedBlocks < dev->nReservedBlocks
+	    && dev->allocationPage == 0) {
+		T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
+	}
+
+	/* Next page please.... */
+	if (dev->allocationBlock >= 0) {
+		bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
+
+		retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
+		    dev->allocationPage;
+		bi->pagesInUse++;
+		yaffs_SetChunkBit(dev, dev->allocationBlock,
+				  dev->allocationPage);
+
+		dev->allocationPage++;
+
+		dev->nFreeChunks--;
+
+		/* If the block is full set the state to full */
+		if (dev->allocationPage >= dev->nChunksPerBlock) {
+			bi->blockState = YAFFS_BLOCK_STATE_FULL;
+			dev->allocationBlock = -1;
+		}
+
+		if(blockUsedPtr)
+			*blockUsedPtr = bi;
+			
+		return retVal;
+	}
+	
+	T(YAFFS_TRACE_ERROR,
+	  (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
+
+	return -1;
+}
+
+static int yaffs_GetErasedChunks(yaffs_Device * dev)
+{
+	int n;
+
+	n = dev->nErasedBlocks * dev->nChunksPerBlock;
+
+	if (dev->allocationBlock > 0) {
+		n += (dev->nChunksPerBlock - dev->allocationPage);
+	}
+
+	return n;
+
+}
+
+static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
+{
+	int oldChunk;
+	int newChunk;
+	int chunkInBlock;
+	int markNAND;
+	int retVal = YAFFS_OK;
+	int cleanups = 0;
+	int i;
+	int isCheckpointBlock;
+	int matchingChunk;
+
+	int chunksBefore = yaffs_GetErasedChunks(dev);
+	int chunksAfter;
+
+	yaffs_ExtendedTags tags;
+
+	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
+
+	yaffs_Object *object;
+
+	isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
+	
+	bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
+
+	T(YAFFS_TRACE_TRACING,
+	  (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
+	   bi->pagesInUse, bi->hasShrinkHeader));
+
+	/*yaffs_VerifyFreeChunks(dev); */
+
+	bi->hasShrinkHeader = 0;	/* clear the flag so that the block can erase */
+
+	/* Take off the number of soft deleted entries because
+	 * they're going to get really deleted during GC.
+	 */
+	dev->nFreeChunks -= bi->softDeletions;
+
+	dev->isDoingGC = 1;
+
+	if (isCheckpointBlock ||
+	    !yaffs_StillSomeChunkBits(dev, block)) {
+		T(YAFFS_TRACE_TRACING,
+		  (TSTR
+		   ("Collecting block %d that has no chunks in use" TENDSTR),
+		   block));
+		yaffs_BlockBecameDirty(dev, block);
+	} else {
+
+		__u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
+		
+		yaffs_VerifyBlock(dev,bi,block);
+
+		for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
+		     chunkInBlock < dev->nChunksPerBlock
+		     && yaffs_StillSomeChunkBits(dev, block);
+		     chunkInBlock++, oldChunk++) {
+			if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
+
+				/* This page is in use and might need to be copied off */
+
+				markNAND = 1;
+
+				yaffs_InitialiseTags(&tags);
+
+				yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
+								buffer, &tags);
+
+				object =
+				    yaffs_FindObjectByNumber(dev,
+							     tags.objectId);
+
+				T(YAFFS_TRACE_GC_DETAIL,
+				  (TSTR
+				   ("Collecting page %d, %d %d %d " TENDSTR),
+				   chunkInBlock, tags.objectId, tags.chunkId,
+				   tags.byteCount));
+				   
+				if(object && !yaffs_SkipVerification(dev)){
+					if(tags.chunkId == 0)
+						matchingChunk = object->chunkId;
+					else if(object->softDeleted)
+						matchingChunk = oldChunk; /* Defeat the test */
+					else
+						matchingChunk = yaffs_FindChunkInFile(object,tags.chunkId,NULL);
+					
+					if(oldChunk != matchingChunk)
+						T(YAFFS_TRACE_ERROR,
+						  (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
+						  oldChunk,matchingChunk,tags.objectId, tags.chunkId));
+						
+				}
+
+				if (!object) {
+					T(YAFFS_TRACE_ERROR,
+					  (TSTR
+					   ("page %d in gc has no object: %d %d %d "
+					    TENDSTR), oldChunk,
+					    tags.objectId, tags.chunkId, tags.byteCount));
+				}
+
+				if (object && object->deleted
+				    && tags.chunkId != 0) {
+					/* Data chunk in a deleted file, throw it away
+					 * It's a soft deleted data chunk,
+					 * No need to copy this, just forget about it and 
+					 * fix up the object.
+					 */
+
+					object->nDataChunks--;
+
+					if (object->nDataChunks <= 0) {
+						/* remeber to clean up the object */
+						dev->gcCleanupList[cleanups] =
+						    tags.objectId;
+						cleanups++;
+					}
+					markNAND = 0;
+				} else if (0
+					   /* Todo object && object->deleted && object->nDataChunks == 0 */
+					   ) {
+					/* Deleted object header with no data chunks.
+					 * Can be discarded and the file deleted.
+					 */
+					object->chunkId = 0;
+					yaffs_FreeTnode(object->myDev,
+							object->variant.
+							fileVariant.top);
+					object->variant.fileVariant.top = NULL;
+					yaffs_DoGenericObjectDeletion(object);
+
+				} else if (object) {
+					/* It's either a data chunk in a live file or
+					 * an ObjectHeader, so we're interested in it.
+					 * NB Need to keep the ObjectHeaders of deleted files
+					 * until the whole file has been deleted off
+					 */
+					tags.serialNumber++;
+
+					dev->nGCCopies++;
+
+					if (tags.chunkId == 0) {
+						/* It is an object Id,
+						 * We need to nuke the shrinkheader flags first
+						 * We no longer want the shrinkHeader flag since its work is done
+						 * and if it is left in place it will mess up scanning.
+						 * Also, clear out any shadowing stuff
+						 */
+
+						yaffs_ObjectHeader *oh;
+						oh = (yaffs_ObjectHeader *)buffer;
+						oh->isShrink = 0;
+						oh->shadowsObject = -1;
+						tags.extraShadows = 0;
+						tags.extraIsShrinkHeader = 0;
+						
+						yaffs_VerifyObjectHeader(object,oh,&tags,1);
+					}
+
+					newChunk =
+					    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
+
+					if (newChunk < 0) {
+						retVal = YAFFS_FAIL;
+					} else {
+
+						/* Ok, now fix up the Tnodes etc. */
+
+						if (tags.chunkId == 0) {
+							/* It's a header */
+							object->chunkId =  newChunk;
+							object->serial =   tags.serialNumber;
+						} else {
+							/* It's a data chunk */
+							yaffs_PutChunkIntoFile
+							    (object,
+							     tags.chunkId,
+							     newChunk, 0);
+						}
+					}
+				}
+
+				yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
+
+			}
+		}
+
+		yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
+
+
+		/* Do any required cleanups */
+		for (i = 0; i < cleanups; i++) {
+			/* Time to delete the file too */
+			object =
+			    yaffs_FindObjectByNumber(dev,
+						     dev->gcCleanupList[i]);
+			if (object) {
+				yaffs_FreeTnode(dev,
+						object->variant.fileVariant.
+						top);
+				object->variant.fileVariant.top = NULL;
+				T(YAFFS_TRACE_GC,
+				  (TSTR
+				   ("yaffs: About to finally delete object %d"
+				    TENDSTR), object->objectId));
+				yaffs_DoGenericObjectDeletion(object);
+				object->myDev->nDeletedFiles--;
+			}
+
+		}
+
+	}
+
+	yaffs_VerifyCollectedBlock(dev,bi,block);
+	  
+	if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
+		T(YAFFS_TRACE_GC,
+		  (TSTR
+		   ("gc did not increase free chunks before %d after %d"
+		    TENDSTR), chunksBefore, chunksAfter));
+	}
+
+	dev->isDoingGC = 0;
+
+	return YAFFS_OK;
+}
+
+/* New garbage collector
+ * If we're very low on erased blocks then we do aggressive garbage collection
+ * otherwise we do "leasurely" garbage collection.
+ * Aggressive gc looks further (whole array) and will accept less dirty blocks.
+ * Passive gc only inspects smaller areas and will only accept more dirty blocks.
+ *
+ * The idea is to help clear out space in a more spread-out manner.
+ * Dunno if it really does anything useful.
+ */
+static int yaffs_CheckGarbageCollection(yaffs_Device * dev)
+{
+	int block;
+	int aggressive;
+	int gcOk = YAFFS_OK;
+	int maxTries = 0;
+	
+	int checkpointBlockAdjust;
+
+	if (dev->isDoingGC) {
+		/* Bail out so we don't get recursive gc */
+		return YAFFS_OK;
+	}
+	
+	/* This loop should pass the first time.
+	 * We'll only see looping here if the erase of the collected block fails.
+	 */
+
+	do {
+		maxTries++;
+		
+		checkpointBlockAdjust = (dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint);
+		if(checkpointBlockAdjust < 0)
+			checkpointBlockAdjust = 0;
+
+		if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
+			/* We need a block soon...*/
+			aggressive = 1;
+		} else {
+			/* We're in no hurry */
+			aggressive = 0;
+		}
+
+		block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
+
+		if (block > 0) {
+			dev->garbageCollections++;
+			if (!aggressive) {
+				dev->passiveGarbageCollections++;
+			}
+
+			T(YAFFS_TRACE_GC,
+			  (TSTR
+			   ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
+			   dev->nErasedBlocks, aggressive));
+
+			gcOk = yaffs_GarbageCollectBlock(dev, block);
+		}
+
+		if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
+			T(YAFFS_TRACE_GC,
+			  (TSTR
+			   ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
+			    TENDSTR), dev->nErasedBlocks, maxTries, block));
+		}
+	} while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
+		 && (maxTries < 2));
+
+	return aggressive ? gcOk : YAFFS_OK;
+}
+
+/*-------------------------  TAGS --------------------------------*/
+
+static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
+			   int chunkInObject)
+{
+	return (tags->chunkId == chunkInObject &&
+		tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
+
+}
+
+
+/*-------------------- Data file manipulation -----------------*/
+
+static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
+				 yaffs_ExtendedTags * tags)
+{
+	/*Get the Tnode, then get the level 0 offset chunk offset */
+	yaffs_Tnode *tn;
+	int theChunk = -1;
+	yaffs_ExtendedTags localTags;
+	int retVal = -1;
+
+	yaffs_Device *dev = in->myDev;
+
+	if (!tags) {
+		/* Passed a NULL, so use our own tags space */
+		tags = &localTags;
+	}
+
+	tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
+
+	if (tn) {
+		theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
+
+		retVal =
+		    yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
+					   chunkInInode);
+	}
+	return retVal;
+}
+
+static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
+					  yaffs_ExtendedTags * tags)
+{
+	/* Get the Tnode, then get the level 0 offset chunk offset */
+	yaffs_Tnode *tn;
+	int theChunk = -1;
+	yaffs_ExtendedTags localTags;
+
+	yaffs_Device *dev = in->myDev;
+	int retVal = -1;
+
+	if (!tags) {
+		/* Passed a NULL, so use our own tags space */
+		tags = &localTags;
+	}
+
+	tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
+
+	if (tn) {
+
+		theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
+
+		retVal =
+		    yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
+					   chunkInInode);
+
+		/* Delete the entry in the filestructure (if found) */
+		if (retVal != -1) {
+			yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0);
+		}
+	} else {
+		/*T(("No level 0 found for %d\n", chunkInInode)); */
+	}
+
+	if (retVal == -1) {
+		/* T(("Could not find %d to delete\n",chunkInInode)); */
+	}
+	return retVal;
+}
+
+#ifdef YAFFS_PARANOID
+
+static int yaffs_CheckFileSanity(yaffs_Object * in)
+{
+	int chunk;
+	int nChunks;
+	int fSize;
+	int failed = 0;
+	int objId;
+	yaffs_Tnode *tn;
+	yaffs_Tags localTags;
+	yaffs_Tags *tags = &localTags;
+	int theChunk;
+	int chunkDeleted;
+
+	if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
+		/* T(("Object not a file\n")); */
+		return YAFFS_FAIL;
+	}
+
+	objId = in->objectId;
+	fSize = in->variant.fileVariant.fileSize;
+	nChunks =
+	    (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
+
+	for (chunk = 1; chunk <= nChunks; chunk++) {
+		tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
+					   chunk);
+
+		if (tn) {
+
+			theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk);
+
+			if (yaffs_CheckChunkBits
+			    (dev, theChunk / dev->nChunksPerBlock,
+			     theChunk % dev->nChunksPerBlock)) {
+
+				yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
+							    tags,
+							    &chunkDeleted);
+				if (yaffs_TagsMatch
+				    (tags, in->objectId, chunk, chunkDeleted)) {
+					/* found it; */
+
+				}
+			} else {
+
+				failed = 1;
+			}
+
+		} else {
+			/* T(("No level 0 found for %d\n", chunk)); */
+		}
+	}
+
+	return failed ? YAFFS_FAIL : YAFFS_OK;
+}
+
+#endif
+
+static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
+				  int chunkInNAND, int inScan)
+{
+	/* NB inScan is zero unless scanning. 
+	 * For forward scanning, inScan is > 0; 
+	 * for backward scanning inScan is < 0
+	 */
+	 
+	yaffs_Tnode *tn;
+	yaffs_Device *dev = in->myDev;
+	int existingChunk;
+	yaffs_ExtendedTags existingTags;
+	yaffs_ExtendedTags newTags;
+	unsigned existingSerial, newSerial;
+
+	if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
+		/* Just ignore an attempt at putting a chunk into a non-file during scanning
+		 * If it is not during Scanning then something went wrong!
+		 */
+		if (!inScan) {
+			T(YAFFS_TRACE_ERROR,
+			  (TSTR
+			   ("yaffs tragedy:attempt to put data chunk into a non-file"
+			    TENDSTR)));
+			YBUG();
+		}
+
+		yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
+		return YAFFS_OK;
+	}
+
+	tn = yaffs_AddOrFindLevel0Tnode(dev, 
+					&in->variant.fileVariant,
+					chunkInInode,
+					NULL);
+	if (!tn) {
+		return YAFFS_FAIL;
+	}
+
+	existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
+
+	if (inScan != 0) {
+		/* If we're scanning then we need to test for duplicates
+		 * NB This does not need to be efficient since it should only ever 
+		 * happen when the power fails during a write, then only one
+		 * chunk should ever be affected.
+		 *
+		 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
+		 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
+		 */
+
+		if (existingChunk != 0) {
+			/* NB Right now existing chunk will not be real chunkId if the device >= 32MB
+			 *    thus we have to do a FindChunkInFile to get the real chunk id.
+			 *
+			 * We have a duplicate now we need to decide which one to use:
+			 *
+			 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
+			 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
+			 * YAFFS1: Get both sets of tags and compare serial numbers.
+			 */
+
+			if (inScan > 0) {
+				/* Only do this for forward scanning */
+				yaffs_ReadChunkWithTagsFromNAND(dev,
+								chunkInNAND,
+								NULL, &newTags);
+
+				/* Do a proper find */
+				existingChunk =
+				    yaffs_FindChunkInFile(in, chunkInInode,
+							  &existingTags);
+			}
+
+			if (existingChunk <= 0) {
+				/*Hoosterman - how did this happen? */
+
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR
+				   ("yaffs tragedy: existing chunk < 0 in scan"
+				    TENDSTR)));
+
+			}
+
+			/* NB The deleted flags should be false, otherwise the chunks will 
+			 * not be loaded during a scan
+			 */
+
+			newSerial = newTags.serialNumber;
+			existingSerial = existingTags.serialNumber;
+
+			if ((inScan > 0) &&
+			    (in->myDev->isYaffs2 ||
+			     existingChunk <= 0 ||
+			     ((existingSerial + 1) & 3) == newSerial)) {
+				/* Forward scanning.                            
+				 * Use new
+				 * Delete the old one and drop through to update the tnode
+				 */
+				yaffs_DeleteChunk(dev, existingChunk, 1,
+						  __LINE__);
+			} else {
+				/* Backward scanning or we want to use the existing one
+				 * Use existing.
+				 * Delete the new one and return early so that the tnode isn't changed
+				 */
+				yaffs_DeleteChunk(dev, chunkInNAND, 1,
+						  __LINE__);
+				return YAFFS_OK;
+			}
+		}
+
+	}
+
+	if (existingChunk == 0) {
+		in->nDataChunks++;
+	}
+
+	yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND);
+
+	return YAFFS_OK;
+}
+
+static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
+					 __u8 * buffer)
+{
+	int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
+
+	if (chunkInNAND >= 0) {
+		return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
+						       buffer,NULL);
+	} else {
+		T(YAFFS_TRACE_NANDACCESS,
+		  (TSTR("Chunk %d not found zero instead" TENDSTR),
+		   chunkInNAND));
+		/* get sane (zero) data if you read a hole */
+		memset(buffer, 0, in->myDev->nDataBytesPerChunk);	
+		return 0;
+	}
+
+}
+
+void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
+{
+	int block;
+	int page;
+	yaffs_ExtendedTags tags;
+	yaffs_BlockInfo *bi;
+
+	if (chunkId <= 0)
+		return;
+		
+
+	dev->nDeletions++;
+	block = chunkId / dev->nChunksPerBlock;
+	page = chunkId % dev->nChunksPerBlock;
+
+
+	if(!yaffs_CheckChunkBit(dev,block,page))
+		T(YAFFS_TRACE_VERIFY,
+		 	(TSTR("Deleting invalid chunk %d"TENDSTR),
+		 	 chunkId));
+
+	bi = yaffs_GetBlockInfo(dev, block);
+
+	T(YAFFS_TRACE_DELETION,
+	  (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
+
+	if (markNAND &&
+	    bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
+
+		yaffs_InitialiseTags(&tags);
+
+		tags.chunkDeleted = 1;
+
+		yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
+		yaffs_HandleUpdateChunk(dev, chunkId, &tags);
+	} else {
+		dev->nUnmarkedDeletions++;
+	}
+
+	/* Pull out of the management area.
+	 * If the whole block became dirty, this will kick off an erasure.
+	 */
+	if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
+	    bi->blockState == YAFFS_BLOCK_STATE_FULL ||
+	    bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+	    bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
+		dev->nFreeChunks++;
+
+		yaffs_ClearChunkBit(dev, block, page);
+
+		bi->pagesInUse--;
+
+		if (bi->pagesInUse == 0 &&
+		    !bi->hasShrinkHeader &&
+		    bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
+		    bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+			yaffs_BlockBecameDirty(dev, block);
+		}
+
+	} else {
+		/* T(("Bad news deleting chunk %d\n",chunkId)); */
+	}
+
+}
+
+static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
+					const __u8 * buffer, int nBytes,
+					int useReserve)
+{
+	/* Find old chunk Need to do this to get serial number
+	 * Write new one and patch into tree.
+	 * Invalidate old tags.
+	 */
+
+	int prevChunkId;
+	yaffs_ExtendedTags prevTags;
+
+	int newChunkId;
+	yaffs_ExtendedTags newTags;
+
+	yaffs_Device *dev = in->myDev;
+
+	yaffs_CheckGarbageCollection(dev);
+
+	/* Get the previous chunk at this location in the file if it exists */
+	prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
+
+	/* Set up new tags */
+	yaffs_InitialiseTags(&newTags);
+
+	newTags.chunkId = chunkInInode;
+	newTags.objectId = in->objectId;
+	newTags.serialNumber =
+	    (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
+	newTags.byteCount = nBytes;
+
+	newChunkId =
+	    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
+					      useReserve);
+
+	if (newChunkId >= 0) {
+		yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
+
+		if (prevChunkId >= 0) {
+			yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
+
+		}
+
+		yaffs_CheckFileSanity(in);
+	}
+	return newChunkId;
+
+}
+
+/* UpdateObjectHeader updates the header on NAND for an object.
+ * If name is not NULL, then that new name is used.
+ */
+int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
+			     int isShrink, int shadows)
+{
+
+	yaffs_BlockInfo *bi;
+
+	yaffs_Device *dev = in->myDev;
+
+	int prevChunkId;
+	int retVal = 0;
+	int result = 0;
+
+	int newChunkId;
+	yaffs_ExtendedTags newTags;
+	yaffs_ExtendedTags oldTags;
+
+	__u8 *buffer = NULL;
+	YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
+
+	yaffs_ObjectHeader *oh = NULL;
+	
+	yaffs_strcpy(oldName,"silly old name");
+
+	if (!in->fake || force) {
+
+		yaffs_CheckGarbageCollection(dev);
+		yaffs_CheckObjectDetailsLoaded(in);
+
+		buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
+		oh = (yaffs_ObjectHeader *) buffer;
+
+		prevChunkId = in->chunkId;
+
+		if (prevChunkId >= 0) {
+			result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
+							buffer, &oldTags);
+			
+			yaffs_VerifyObjectHeader(in,oh,&oldTags,0);
+										
+			memcpy(oldName, oh->name, sizeof(oh->name));
+		}
+
+		memset(buffer, 0xFF, dev->nDataBytesPerChunk);
+
+		oh->type = in->variantType;
+		oh->yst_mode = in->yst_mode;
+		oh->shadowsObject = shadows;
+
+#ifdef CONFIG_YAFFS_WINCE
+		oh->win_atime[0] = in->win_atime[0];
+		oh->win_ctime[0] = in->win_ctime[0];
+		oh->win_mtime[0] = in->win_mtime[0];
+		oh->win_atime[1] = in->win_atime[1];
+		oh->win_ctime[1] = in->win_ctime[1];
+		oh->win_mtime[1] = in->win_mtime[1];
+#else
+		oh->yst_uid = in->yst_uid;
+		oh->yst_gid = in->yst_gid;
+		oh->yst_atime = in->yst_atime;
+		oh->yst_mtime = in->yst_mtime;
+		oh->yst_ctime = in->yst_ctime;
+		oh->yst_rdev = in->yst_rdev;
+#endif
+		if (in->parent) {
+			oh->parentObjectId = in->parent->objectId;
+		} else {
+			oh->parentObjectId = 0;
+		}
+
+		if (name && *name) {
+			memset(oh->name, 0, sizeof(oh->name));
+			yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
+		} else if (prevChunkId>=0) {
+			memcpy(oh->name, oldName, sizeof(oh->name));
+		} else {
+			memset(oh->name, 0, sizeof(oh->name));
+		}
+
+		oh->isShrink = isShrink;
+
+		switch (in->variantType) {
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+			/* Should not happen */
+			break;
+		case YAFFS_OBJECT_TYPE_FILE:
+			oh->fileSize =
+			    (oh->parentObjectId == YAFFS_OBJECTID_DELETED
+			     || oh->parentObjectId ==
+			     YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
+			    fileVariant.fileSize;
+			break;
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+			oh->equivalentObjectId =
+			    in->variant.hardLinkVariant.equivalentObjectId;
+			break;
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+			/* Do nothing */
+			break;
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+			/* Do nothing */
+			break;
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+			yaffs_strncpy(oh->alias,
+				      in->variant.symLinkVariant.alias,
+				      YAFFS_MAX_ALIAS_LENGTH);
+			oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
+			break;
+		}
+
+		/* Tags */
+		yaffs_InitialiseTags(&newTags);
+		in->serial++;
+		newTags.chunkId = 0;
+		newTags.objectId = in->objectId;
+		newTags.serialNumber = in->serial;
+
+		/* Add extra info for file header */
+
+		newTags.extraHeaderInfoAvailable = 1;
+		newTags.extraParentObjectId = oh->parentObjectId;
+		newTags.extraFileLength = oh->fileSize;
+		newTags.extraIsShrinkHeader = oh->isShrink;
+		newTags.extraEquivalentObjectId = oh->equivalentObjectId;
+		newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
+		newTags.extraObjectType = in->variantType;
+
+		yaffs_VerifyObjectHeader(in,oh,&newTags,1);
+
+		/* Create new chunk in NAND */
+		newChunkId =
+		    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
+						      (prevChunkId >= 0) ? 1 : 0);
+
+		if (newChunkId >= 0) {
+
+			in->chunkId = newChunkId;
+
+			if (prevChunkId >= 0) {
+				yaffs_DeleteChunk(dev, prevChunkId, 1,
+						  __LINE__);
+			}
+
+			if(!yaffs_ObjectHasCachedWriteData(in))
+				in->dirty = 0;
+
+			/* If this was a shrink, then mark the block that the chunk lives on */
+			if (isShrink) {
+				bi = yaffs_GetBlockInfo(in->myDev,
+							newChunkId /in->myDev->	nChunksPerBlock);
+				bi->hasShrinkHeader = 1;
+			}
+
+		}
+
+		retVal = newChunkId;
+
+	}
+
+	if (buffer)
+		yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
+
+	return retVal;
+}
+
+/*------------------------ Short Operations Cache ----------------------------------------
+ *   In many situations where there is no high level buffering (eg WinCE) a lot of
+ *   reads might be short sequential reads, and a lot of writes may be short 
+ *   sequential writes. eg. scanning/writing a jpeg file.
+ *   In these cases, a short read/write cache can provide a huge perfomance benefit 
+ *   with dumb-as-a-rock code.
+ *   In Linux, the page cache provides read buffering aand the short op cache provides write 
+ *   buffering.
+ *
+ *   There are a limited number (~10) of cache chunks per device so that we don't
+ *   need a very intelligent search.
+ */
+
+static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
+{
+	yaffs_Device *dev = obj->myDev;
+	int i;
+	yaffs_ChunkCache *cache;
+	int nCaches = obj->myDev->nShortOpCaches;
+	
+	for(i = 0; i < nCaches; i++){
+		cache = &dev->srCache[i];
+		if (cache->object == obj &&
+		    cache->dirty)
+			return 1;
+	}
+	
+	return 0;
+}
+
+
+static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
+{
+	yaffs_Device *dev = obj->myDev;
+	int lowest = -99;	/* Stop compiler whining. */
+	int i;
+	yaffs_ChunkCache *cache;
+	int chunkWritten = 0;
+	int nCaches = obj->myDev->nShortOpCaches;
+
+	if (nCaches > 0) {
+		do {
+			cache = NULL;
+
+			/* Find the dirty cache for this object with the lowest chunk id. */
+			for (i = 0; i < nCaches; i++) {
+				if (dev->srCache[i].object == obj &&
+				    dev->srCache[i].dirty) {
+					if (!cache
+					    || dev->srCache[i].chunkId <
+					    lowest) {
+						cache = &dev->srCache[i];
+						lowest = cache->chunkId;
+					}
+				}
+			}
+
+			if (cache && !cache->locked) {
+				/* Write it out and free it up */
+
+				chunkWritten =
+				    yaffs_WriteChunkDataToObject(cache->object,
+								 cache->chunkId,
+								 cache->data,
+								 cache->nBytes,
+								 1);
+				cache->dirty = 0;
+				cache->object = NULL;
+			}
+
+		} while (cache && chunkWritten > 0);
+
+		if (cache) {
+			/* Hoosterman, disk full while writing cache out. */
+			T(YAFFS_TRACE_ERROR,
+			  (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
+
+		}
+	}
+
+}
+
+/*yaffs_FlushEntireDeviceCache(dev)
+ *
+ *
+ */
+
+void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
+{
+	yaffs_Object *obj;
+	int nCaches = dev->nShortOpCaches;
+	int i;
+	
+	/* Find a dirty object in the cache and flush it...
+	 * until there are no further dirty objects.
+	 */
+	do {
+		obj = NULL;
+		for( i = 0; i < nCaches && !obj; i++) {
+			if (dev->srCache[i].object &&
+			    dev->srCache[i].dirty)
+				obj = dev->srCache[i].object;
+			    
+		}
+		if(obj)
+			yaffs_FlushFilesChunkCache(obj);
+			
+	} while(obj);
+	
+}
+
+
+/* Grab us a cache chunk for use.
+ * First look for an empty one. 
+ * Then look for the least recently used non-dirty one.
+ * Then look for the least recently used dirty one...., flush and look again.
+ */
+static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
+{
+	int i;
+	int usage;
+	int theOne;
+
+	if (dev->nShortOpCaches > 0) {
+		for (i = 0; i < dev->nShortOpCaches; i++) {
+			if (!dev->srCache[i].object) 
+				return &dev->srCache[i];
+		}
+
+		return NULL;
+
+		theOne = -1;
+		usage = 0;	/* just to stop the compiler grizzling */
+
+		for (i = 0; i < dev->nShortOpCaches; i++) {
+			if (!dev->srCache[i].dirty &&
+			    ((dev->srCache[i].lastUse < usage && theOne >= 0) ||
+			     theOne < 0)) {
+				usage = dev->srCache[i].lastUse;
+				theOne = i;
+			}
+		}
+
+
+		return theOne >= 0 ? &dev->srCache[theOne] : NULL;
+	} else {
+		return NULL;
+	}
+
+}
+
+static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
+{
+	yaffs_ChunkCache *cache;
+	yaffs_Object *theObj;
+	int usage;
+	int i;
+	int pushout;
+
+	if (dev->nShortOpCaches > 0) {
+		/* Try find a non-dirty one... */
+
+		cache = yaffs_GrabChunkCacheWorker(dev);
+
+		if (!cache) {
+			/* They were all dirty, find the last recently used object and flush
+			 * its cache, then  find again.
+			 * NB what's here is not very accurate, we actually flush the object
+			 * the last recently used page.
+			 */
+
+			/* With locking we can't assume we can use entry zero */
+
+			theObj = NULL;
+			usage = -1;
+			cache = NULL;
+			pushout = -1;
+
+			for (i = 0; i < dev->nShortOpCaches; i++) {
+				if (dev->srCache[i].object &&
+				    !dev->srCache[i].locked &&
+				    (dev->srCache[i].lastUse < usage || !cache))
+				{
+					usage = dev->srCache[i].lastUse;
+					theObj = dev->srCache[i].object;
+					cache = &dev->srCache[i];
+					pushout = i;
+				}
+			}
+
+			if (!cache || cache->dirty) {
+				/* Flush and try again */
+				yaffs_FlushFilesChunkCache(theObj);
+				cache = yaffs_GrabChunkCacheWorker(dev);
+			}
+
+		}
+		return cache;
+	} else
+		return NULL;
+
+}
+
+/* Find a cached chunk */
+static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
+					      int chunkId)
+{
+	yaffs_Device *dev = obj->myDev;
+	int i;
+	if (dev->nShortOpCaches > 0) {
+		for (i = 0; i < dev->nShortOpCaches; i++) {
+			if (dev->srCache[i].object == obj &&
+			    dev->srCache[i].chunkId == chunkId) {
+				dev->cacheHits++;
+
+				return &dev->srCache[i];
+			}
+		}
+	}
+	return NULL;
+}
+
+/* Mark the chunk for the least recently used algorithym */
+static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
+				int isAWrite)
+{
+
+	if (dev->nShortOpCaches > 0) {
+		if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
+			/* Reset the cache usages */
+			int i;
+			for (i = 1; i < dev->nShortOpCaches; i++) {
+				dev->srCache[i].lastUse = 0;
+			}
+			dev->srLastUse = 0;
+		}
+
+		dev->srLastUse++;
+
+		cache->lastUse = dev->srLastUse;
+
+		if (isAWrite) {
+			cache->dirty = 1;
+		}
+	}
+}
+
+/* Invalidate a single cache page.
+ * Do this when a whole page gets written,
+ * ie the short cache for this page is no longer valid.
+ */
+static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId)
+{
+	if (object->myDev->nShortOpCaches > 0) {
+		yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
+
+		if (cache) {
+			cache->object = NULL;
+		}
+	}
+}
+
+/* Invalidate all the cache pages associated with this object
+ * Do this whenever ther file is deleted or resized.
+ */
+static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in)
+{
+	int i;
+	yaffs_Device *dev = in->myDev;
+
+	if (dev->nShortOpCaches > 0) {
+		/* Invalidate it. */
+		for (i = 0; i < dev->nShortOpCaches; i++) {
+			if (dev->srCache[i].object == in) {
+				dev->srCache[i].object = NULL;
+			}
+		}
+	}
+}
+
+/*--------------------- Checkpointing --------------------*/
+
+
+static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev,int head)
+{
+	yaffs_CheckpointValidity cp;
+	
+	memset(&cp,0,sizeof(cp));
+	
+	cp.structType = sizeof(cp);
+	cp.magic = YAFFS_MAGIC;
+	cp.version = YAFFS_CHECKPOINT_VERSION;
+	cp.head = (head) ? 1 : 0;
+	
+	return (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp))?
+		1 : 0;
+}
+
+static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
+{
+	yaffs_CheckpointValidity cp;
+	int ok;
+	
+	ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
+	
+	if(ok)
+		ok = (cp.structType == sizeof(cp)) &&
+		     (cp.magic == YAFFS_MAGIC) &&
+		     (cp.version == YAFFS_CHECKPOINT_VERSION) &&
+		     (cp.head == ((head) ? 1 : 0));
+	return ok ? 1 : 0;
+}
+
+static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp, 
+					   yaffs_Device *dev)
+{
+	cp->nErasedBlocks = dev->nErasedBlocks;
+	cp->allocationBlock = dev->allocationBlock;
+	cp->allocationPage = dev->allocationPage;
+	cp->nFreeChunks = dev->nFreeChunks;
+	
+	cp->nDeletedFiles = dev->nDeletedFiles;
+	cp->nUnlinkedFiles = dev->nUnlinkedFiles;
+	cp->nBackgroundDeletions = dev->nBackgroundDeletions;
+	cp->sequenceNumber = dev->sequenceNumber;
+	cp->oldestDirtySequence = dev->oldestDirtySequence;
+	
+}
+
+static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
+					   yaffs_CheckpointDevice *cp)
+{
+	dev->nErasedBlocks = cp->nErasedBlocks;
+	dev->allocationBlock = cp->allocationBlock;
+	dev->allocationPage = cp->allocationPage;
+	dev->nFreeChunks = cp->nFreeChunks;
+	
+	dev->nDeletedFiles = cp->nDeletedFiles;
+	dev->nUnlinkedFiles = cp->nUnlinkedFiles;
+	dev->nBackgroundDeletions = cp->nBackgroundDeletions;
+	dev->sequenceNumber = cp->sequenceNumber;
+	dev->oldestDirtySequence = cp->oldestDirtySequence;
+}
+
+
+static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
+{
+	yaffs_CheckpointDevice cp;
+	__u32 nBytes;
+	__u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
+
+	int ok;
+		
+	/* Write device runtime values*/
+	yaffs_DeviceToCheckpointDevice(&cp,dev);
+	cp.structType = sizeof(cp);
+	
+	ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
+	
+	/* Write block info */
+	if(ok) {
+		nBytes = nBlocks * sizeof(yaffs_BlockInfo);
+		ok = (yaffs_CheckpointWrite(dev,dev->blockInfo,nBytes) == nBytes);
+	}
+		
+	/* Write chunk bits */		
+	if(ok) {
+		nBytes = nBlocks * dev->chunkBitmapStride;
+		ok = (yaffs_CheckpointWrite(dev,dev->chunkBits,nBytes) == nBytes);
+	}
+	return	 ok ? 1 : 0;
+
+}
+
+static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
+{
+	yaffs_CheckpointDevice cp;
+	__u32 nBytes;
+	__u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
+
+	int ok;	
+	
+	ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
+	if(!ok)
+		return 0;
+		
+	if(cp.structType != sizeof(cp))
+		return 0;
+		
+	
+	yaffs_CheckpointDeviceToDevice(dev,&cp);
+	
+	nBytes = nBlocks * sizeof(yaffs_BlockInfo);
+	
+	ok = (yaffs_CheckpointRead(dev,dev->blockInfo,nBytes) == nBytes);
+	
+	if(!ok)
+		return 0;
+	nBytes = nBlocks * dev->chunkBitmapStride;
+	
+	ok = (yaffs_CheckpointRead(dev,dev->chunkBits,nBytes) == nBytes);
+	
+	return ok ? 1 : 0;
+}
+
+static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
+					   yaffs_Object *obj)
+{
+
+	cp->objectId = obj->objectId;
+	cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
+	cp->chunkId = obj->chunkId;
+	cp->variantType = obj->variantType;			
+	cp->deleted = obj->deleted;
+	cp->softDeleted = obj->softDeleted;
+	cp->unlinked = obj->unlinked;
+	cp->fake = obj->fake;
+	cp->renameAllowed = obj->renameAllowed;
+	cp->unlinkAllowed = obj->unlinkAllowed;
+	cp->serial = obj->serial;
+	cp->nDataChunks = obj->nDataChunks;
+	
+	if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
+		cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
+	else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
+		cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
+}
+
+static void yaffs_CheckpointObjectToObject( yaffs_Object *obj,yaffs_CheckpointObject *cp)
+{
+
+	yaffs_Object *parent;
+	
+	obj->objectId = cp->objectId;
+	
+	if(cp->parentId)
+		parent = yaffs_FindOrCreateObjectByNumber(
+					obj->myDev,
+					cp->parentId,
+					YAFFS_OBJECT_TYPE_DIRECTORY);
+	else
+		parent = NULL;
+		
+	if(parent)
+		yaffs_AddObjectToDirectory(parent, obj);
+		
+	obj->chunkId = cp->chunkId;
+	obj->variantType = cp->variantType;			
+	obj->deleted = cp->deleted;
+	obj->softDeleted = cp->softDeleted;
+	obj->unlinked = cp->unlinked;
+	obj->fake = cp->fake;
+	obj->renameAllowed = cp->renameAllowed;
+	obj->unlinkAllowed = cp->unlinkAllowed;
+	obj->serial = cp->serial;
+	obj->nDataChunks = cp->nDataChunks;
+	
+	if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
+		obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
+	else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
+		obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
+		
+	if(obj->objectId >= YAFFS_NOBJECT_BUCKETS)
+		obj->lazyLoaded = 1;
+}
+
+
+
+static int yaffs_CheckpointTnodeWorker(yaffs_Object * in, yaffs_Tnode * tn,
+				  	__u32 level, int chunkOffset)
+{
+	int i;
+	yaffs_Device *dev = in->myDev;
+	int ok = 1;
+	int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
+
+	if (tn) {
+		if (level > 0) {
+
+			for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
+				if (tn->internal[i]) {
+					ok = yaffs_CheckpointTnodeWorker(in,
+							tn->internal[i],
+							level - 1,
+							(chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
+				}
+			}
+		} else if (level == 0) {
+			__u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
+			/* printf("write tnode at %d\n",baseOffset); */
+			ok = (yaffs_CheckpointWrite(dev,&baseOffset,sizeof(baseOffset)) == sizeof(baseOffset));
+			if(ok)
+				ok = (yaffs_CheckpointWrite(dev,tn,nTnodeBytes) == nTnodeBytes);
+		}
+	}
+
+	return ok;
+
+}
+
+static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
+{
+	__u32 endMarker = ~0;
+	int ok = 1;
+	
+	if(obj->variantType == YAFFS_OBJECT_TYPE_FILE){
+		ok = yaffs_CheckpointTnodeWorker(obj,
+					    obj->variant.fileVariant.top,
+					    obj->variant.fileVariant.topLevel,
+					    0);
+		if(ok)
+			ok = (yaffs_CheckpointWrite(obj->myDev,&endMarker,sizeof(endMarker)) == 
+				sizeof(endMarker));
+	}
+	
+	return ok ? 1 : 0;
+}
+
+static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
+{
+	__u32 baseChunk;
+	int ok = 1;
+	yaffs_Device *dev = obj->myDev;
+	yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
+	yaffs_Tnode *tn;
+	int nread = 0;
+	
+	ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
+	
+	while(ok && (~baseChunk)){
+		nread++;
+		/* Read level 0 tnode */
+		
+		
+		/* printf("read  tnode at %d\n",baseChunk); */
+		tn = yaffs_GetTnodeRaw(dev);
+		if(tn)
+			ok = (yaffs_CheckpointRead(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8) ==
+			      (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
+		else
+			ok = 0;
+			
+		if(tn && ok){
+			ok = yaffs_AddOrFindLevel0Tnode(dev,
+					       		fileStructPtr,
+					       		baseChunk,
+					       		tn) ? 1 : 0;
+					       		
+		}
+			
+		if(ok)
+			ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
+		
+	}
+
+	T(YAFFS_TRACE_CHECKPOINT,(
+		TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
+		nread,baseChunk,ok));
+
+	return ok ? 1 : 0;	
+}
+ 
+
+static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
+{
+	yaffs_Object *obj;
+	yaffs_CheckpointObject cp;
+	int i;
+	int ok = 1;
+	struct list_head *lh;
+
+	
+	/* Iterate through the objects in each hash entry,
+	 * dumping them to the checkpointing stream.
+	 */
+	 
+	 for(i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++){
+	 	list_for_each(lh, &dev->objectBucket[i].list) {
+			if (lh) {
+				obj = list_entry(lh, yaffs_Object, hashLink);
+				if (!obj->deferedFree) {
+					yaffs_ObjectToCheckpointObject(&cp,obj);
+					cp.structType = sizeof(cp);
+
+					T(YAFFS_TRACE_CHECKPOINT,(
+						TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
+						cp.objectId,cp.parentId,cp.variantType,cp.chunkId,(unsigned) obj));
+						
+					ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
+					
+					if(ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE){
+						ok = yaffs_WriteCheckpointTnodes(obj);
+					}
+				}
+			}
+		}
+	 }
+	 
+	 /* Dump end of list */
+	memset(&cp,0xFF,sizeof(yaffs_CheckpointObject));
+	cp.structType = sizeof(cp);
+	
+	if(ok)
+		ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
+		
+	return ok ? 1 : 0;
+}
+
+static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
+{
+	yaffs_Object *obj;
+	yaffs_CheckpointObject cp;
+	int ok = 1;
+	int done = 0;
+	yaffs_Object *hardList = NULL;
+	
+	while(ok && !done) {
+		ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
+		if(cp.structType != sizeof(cp)) {
+			T(YAFFS_TRACE_CHECKPOINT,(TSTR("struct size %d instead of %d ok %d"TENDSTR),
+				cp.structType,sizeof(cp),ok));
+			ok = 0;
+		}
+			
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
+			cp.objectId,cp.parentId,cp.variantType,cp.chunkId));
+			
+		if(ok && cp.objectId == ~0)
+			done = 1;
+		else if(ok){
+			obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType);
+			if(obj) {
+				yaffs_CheckpointObjectToObject(obj,&cp);
+				if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
+					ok = yaffs_ReadCheckpointTnodes(obj);
+				} else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
+					obj->hardLinks.next =
+						    (struct list_head *)
+						    hardList;
+					hardList = obj;
+				}
+			   
+			}
+		}
+	}
+	
+	if(ok)
+		yaffs_HardlinkFixup(dev,hardList);
+	
+	return ok ? 1 : 0;
+}
+
+static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
+{
+	__u32 checkpointSum;
+	int ok;
+	
+	yaffs_GetCheckpointSum(dev,&checkpointSum);
+	
+	ok = (yaffs_CheckpointWrite(dev,&checkpointSum,sizeof(checkpointSum)) == sizeof(checkpointSum));
+	
+	if(!ok)
+		return 0;
+	
+	return 1;
+}
+
+static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
+{
+	__u32 checkpointSum0;
+	__u32 checkpointSum1;
+	int ok;
+	
+	yaffs_GetCheckpointSum(dev,&checkpointSum0);
+	
+	ok = (yaffs_CheckpointRead(dev,&checkpointSum1,sizeof(checkpointSum1)) == sizeof(checkpointSum1));
+	
+	if(!ok)
+		return 0;
+		
+	if(checkpointSum0 != checkpointSum1)
+		return 0;
+	
+	return 1;
+}
+
+
+static int yaffs_WriteCheckpointData(yaffs_Device *dev)
+{
+
+	int ok = 1;
+	
+	if(dev->skipCheckpointWrite || !dev->isYaffs2){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint write" TENDSTR)));
+		ok = 0;
+	}
+		
+	if(ok)
+		ok = yaffs_CheckpointOpen(dev,1);
+	
+	if(ok){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
+		ok = yaffs_WriteCheckpointValidityMarker(dev,1);
+	}
+	if(ok){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint device" TENDSTR)));
+		ok = yaffs_WriteCheckpointDevice(dev);
+	}
+	if(ok){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint objects" TENDSTR)));
+		ok = yaffs_WriteCheckpointObjects(dev);
+	}
+	if(ok){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
+		ok = yaffs_WriteCheckpointValidityMarker(dev,0);
+	}
+	
+	if(ok){
+		ok = yaffs_WriteCheckpointSum(dev);
+	}
+	
+	
+	if(!yaffs_CheckpointClose(dev))
+		 ok = 0;
+		 
+	if(ok)
+	    	dev->isCheckpointed = 1;
+	 else 
+	 	dev->isCheckpointed = 0;
+
+	return dev->isCheckpointed;
+}
+
+static int yaffs_ReadCheckpointData(yaffs_Device *dev)
+{
+	int ok = 1;
+	
+	if(dev->skipCheckpointRead || !dev->isYaffs2){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint read" TENDSTR)));
+		ok = 0;
+	}
+	
+	if(ok)
+		ok = yaffs_CheckpointOpen(dev,0); /* open for read */
+	
+	if(ok){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));	
+		ok = yaffs_ReadCheckpointValidityMarker(dev,1);
+	}
+	if(ok){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint device" TENDSTR)));
+		ok = yaffs_ReadCheckpointDevice(dev);
+	}
+	if(ok){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint objects" TENDSTR)));	
+		ok = yaffs_ReadCheckpointObjects(dev);
+	}
+	if(ok){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
+		ok = yaffs_ReadCheckpointValidityMarker(dev,0);
+	}
+	
+	if(ok){
+		ok = yaffs_ReadCheckpointSum(dev);
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint checksum %d" TENDSTR),ok));
+	}
+
+	if(!yaffs_CheckpointClose(dev))
+		ok = 0;
+
+	if(ok)
+	    	dev->isCheckpointed = 1;
+	 else 
+	 	dev->isCheckpointed = 0;
+
+	return ok ? 1 : 0;
+
+}
+
+static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
+{
+	if(dev->isCheckpointed || 
+	   dev->blocksInCheckpoint > 0){
+		dev->isCheckpointed = 0;
+		yaffs_CheckpointInvalidateStream(dev);
+		if(dev->superBlock && dev->markSuperBlockDirty)
+			dev->markSuperBlockDirty(dev->superBlock);
+	}
+}
+
+
+int yaffs_CheckpointSave(yaffs_Device *dev)
+{
+
+	T(YAFFS_TRACE_CHECKPOINT,(TSTR("save entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
+
+	yaffs_VerifyObjects(dev);
+	yaffs_VerifyBlocks(dev);
+	yaffs_VerifyFreeChunks(dev);
+
+	if(!dev->isCheckpointed) {
+		yaffs_InvalidateCheckpoint(dev);
+		yaffs_WriteCheckpointData(dev);
+	}
+	
+	T(YAFFS_TRACE_ALWAYS,(TSTR("save exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
+
+	return dev->isCheckpointed;
+}
+
+int yaffs_CheckpointRestore(yaffs_Device *dev)
+{
+	int retval;
+	T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
+		
+	retval = yaffs_ReadCheckpointData(dev);
+
+	if(dev->isCheckpointed){
+		yaffs_VerifyObjects(dev);
+		yaffs_VerifyBlocks(dev);
+		yaffs_VerifyFreeChunks(dev);
+	}
+
+	T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
+	
+	return retval;
+}
+
+/*--------------------- File read/write ------------------------
+ * Read and write have very similar structures.
+ * In general the read/write has three parts to it
+ * An incomplete chunk to start with (if the read/write is not chunk-aligned)
+ * Some complete chunks
+ * An incomplete chunk to end off with
+ *
+ * Curve-balls: the first chunk might also be the last chunk.
+ */
+
+int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, loff_t offset,
+			   int nBytes)
+{
+
+	int chunk;
+	int start;
+	int nToCopy;
+	int n = nBytes;
+	int nDone = 0;
+	yaffs_ChunkCache *cache;
+
+	yaffs_Device *dev;
+
+	dev = in->myDev;
+
+	while (n > 0) {
+		//chunk = offset / dev->nDataBytesPerChunk + 1;
+		//start = offset % dev->nDataBytesPerChunk;
+		yaffs_AddrToChunk(dev,offset,&chunk,&start);
+		chunk++;
+
+		/* OK now check for the curveball where the start and end are in
+		 * the same chunk.      
+		 */
+		if ((start + n) < dev->nDataBytesPerChunk) {
+			nToCopy = n;
+		} else {
+			nToCopy = dev->nDataBytesPerChunk - start;
+		}
+
+		cache = yaffs_FindChunkCache(in, chunk);
+
+		/* If the chunk is already in the cache or it is less than a whole chunk
+		 * then use the cache (if there is caching)
+		 * else bypass the cache.
+		 */
+		if (cache || nToCopy != dev->nDataBytesPerChunk) {
+			if (dev->nShortOpCaches > 0) {
+
+				/* If we can't find the data in the cache, then load it up. */
+
+				if (!cache) {
+					cache = yaffs_GrabChunkCache(in->myDev);
+					cache->object = in;
+					cache->chunkId = chunk;
+					cache->dirty = 0;
+					cache->locked = 0;
+					yaffs_ReadChunkDataFromObject(in, chunk,
+								      cache->
+								      data);
+					cache->nBytes = 0;
+				}
+
+				yaffs_UseChunkCache(dev, cache, 0);
+
+				cache->locked = 1;
+
+#ifdef CONFIG_YAFFS_WINCE
+				yfsd_UnlockYAFFS(TRUE);
+#endif
+				memcpy(buffer, &cache->data[start], nToCopy);
+
+#ifdef CONFIG_YAFFS_WINCE
+				yfsd_LockYAFFS(TRUE);
+#endif
+				cache->locked = 0;
+			} else {
+				/* Read into the local buffer then copy..*/
+
+				__u8 *localBuffer =
+				    yaffs_GetTempBuffer(dev, __LINE__);
+				yaffs_ReadChunkDataFromObject(in, chunk,
+							      localBuffer);
+#ifdef CONFIG_YAFFS_WINCE
+				yfsd_UnlockYAFFS(TRUE);
+#endif
+				memcpy(buffer, &localBuffer[start], nToCopy);
+
+#ifdef CONFIG_YAFFS_WINCE
+				yfsd_LockYAFFS(TRUE);
+#endif
+				yaffs_ReleaseTempBuffer(dev, localBuffer,
+							__LINE__);
+			}
+
+		} else {
+#ifdef CONFIG_YAFFS_WINCE
+			__u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
+
+			/* Under WinCE can't do direct transfer. Need to use a local buffer.
+			 * This is because we otherwise screw up WinCE's memory mapper
+			 */
+			yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
+
+#ifdef CONFIG_YAFFS_WINCE
+			yfsd_UnlockYAFFS(TRUE);
+#endif
+			memcpy(buffer, localBuffer, dev->nDataBytesPerChunk);
+
+#ifdef CONFIG_YAFFS_WINCE
+			yfsd_LockYAFFS(TRUE);
+			yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
+#endif
+
+#else
+			/* A full chunk. Read directly into the supplied buffer. */
+			yaffs_ReadChunkDataFromObject(in, chunk, buffer);
+#endif
+		}
+
+		n -= nToCopy;
+		offset += nToCopy;
+		buffer += nToCopy;
+		nDone += nToCopy;
+
+	}
+
+	return nDone;
+}
+
+int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, loff_t offset,
+			  int nBytes, int writeThrough)
+{
+
+	int chunk;
+	int start;
+	int nToCopy;
+	int n = nBytes;
+	int nDone = 0;
+	int nToWriteBack;
+	int startOfWrite = offset;
+	int chunkWritten = 0;
+	int nBytesRead;
+
+	yaffs_Device *dev;
+
+	dev = in->myDev;
+
+	while (n > 0 && chunkWritten >= 0) {
+		//chunk = offset / dev->nDataBytesPerChunk + 1;
+		//start = offset % dev->nDataBytesPerChunk;
+		yaffs_AddrToChunk(dev,offset,&chunk,&start);
+		chunk++;
+
+		/* OK now check for the curveball where the start and end are in
+		 * the same chunk.
+		 */
+
+		if ((start + n) < dev->nDataBytesPerChunk) {
+			nToCopy = n;
+
+			/* Now folks, to calculate how many bytes to write back....
+			 * If we're overwriting and not writing to then end of file then
+			 * we need to write back as much as was there before.
+			 */
+
+			nBytesRead =
+			    in->variant.fileVariant.fileSize -
+			    ((chunk - 1) * dev->nDataBytesPerChunk);
+
+			if (nBytesRead > dev->nDataBytesPerChunk) {
+				nBytesRead = dev->nDataBytesPerChunk;
+			}
+
+			nToWriteBack =
+			    (nBytesRead >
+			     (start + n)) ? nBytesRead : (start + n);
+
+		} else {
+			nToCopy = dev->nDataBytesPerChunk - start;
+			nToWriteBack = dev->nDataBytesPerChunk;
+		}
+
+		if (nToCopy != dev->nDataBytesPerChunk) {
+			/* An incomplete start or end chunk (or maybe both start and end chunk) */
+			if (dev->nShortOpCaches > 0) {
+				yaffs_ChunkCache *cache;
+				/* If we can't find the data in the cache, then load the cache */
+				cache = yaffs_FindChunkCache(in, chunk);
+				
+				if (!cache
+				    && yaffs_CheckSpaceForAllocation(in->
+								     myDev)) {
+					cache = yaffs_GrabChunkCache(in->myDev);
+					cache->object = in;
+					cache->chunkId = chunk;
+					cache->dirty = 0;
+					cache->locked = 0;
+					yaffs_ReadChunkDataFromObject(in, chunk,
+								      cache->
+								      data);
+				}
+				else if(cache && 
+				        !cache->dirty &&
+					!yaffs_CheckSpaceForAllocation(in->myDev)){
+					/* Drop the cache if it was a read cache item and
+					 * no space check has been made for it.
+					 */ 
+					 cache = NULL;
+				}
+
+				if (cache) {
+					yaffs_UseChunkCache(dev, cache, 1);
+					cache->locked = 1;
+#ifdef CONFIG_YAFFS_WINCE
+					yfsd_UnlockYAFFS(TRUE);
+#endif
+
+					memcpy(&cache->data[start], buffer,
+					       nToCopy);
+
+#ifdef CONFIG_YAFFS_WINCE
+					yfsd_LockYAFFS(TRUE);
+#endif
+					cache->locked = 0;
+					cache->nBytes = nToWriteBack;
+
+					if (writeThrough) {
+						chunkWritten =
+						    yaffs_WriteChunkDataToObject
+						    (cache->object,
+						     cache->chunkId,
+						     cache->data, cache->nBytes,
+						     1);
+						cache->dirty = 0;
+					}
+
+				} else {
+					chunkWritten = -1;	/* fail the write */
+				}
+			} else {
+				/* An incomplete start or end chunk (or maybe both start and end chunk)
+				 * Read into the local buffer then copy, then copy over and write back.
+				 */
+
+				__u8 *localBuffer =
+				    yaffs_GetTempBuffer(dev, __LINE__);
+
+				yaffs_ReadChunkDataFromObject(in, chunk,
+							      localBuffer);
+
+#ifdef CONFIG_YAFFS_WINCE
+				yfsd_UnlockYAFFS(TRUE);
+#endif
+
+				memcpy(&localBuffer[start], buffer, nToCopy);
+
+#ifdef CONFIG_YAFFS_WINCE
+				yfsd_LockYAFFS(TRUE);
+#endif
+				chunkWritten =
+				    yaffs_WriteChunkDataToObject(in, chunk,
+								 localBuffer,
+								 nToWriteBack,
+								 0);
+
+				yaffs_ReleaseTempBuffer(dev, localBuffer,
+							__LINE__);
+
+			}
+
+		} else {
+
+#ifdef CONFIG_YAFFS_WINCE
+			/* Under WinCE can't do direct transfer. Need to use a local buffer.
+			 * This is because we otherwise screw up WinCE's memory mapper
+			 */
+			__u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
+#ifdef CONFIG_YAFFS_WINCE
+			yfsd_UnlockYAFFS(TRUE);
+#endif
+			memcpy(localBuffer, buffer, dev->nDataBytesPerChunk);
+#ifdef CONFIG_YAFFS_WINCE
+			yfsd_LockYAFFS(TRUE);
+#endif
+			chunkWritten =
+			    yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
+							 dev->nDataBytesPerChunk,
+							 0);
+			yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
+#else
+			/* A full chunk. Write directly from the supplied buffer. */
+			chunkWritten =
+			    yaffs_WriteChunkDataToObject(in, chunk, buffer,
+							 dev->nDataBytesPerChunk,
+							 0);
+#endif
+			/* Since we've overwritten the cached data, we better invalidate it. */
+			yaffs_InvalidateChunkCache(in, chunk);
+		}
+
+		if (chunkWritten >= 0) {
+			n -= nToCopy;
+			offset += nToCopy;
+			buffer += nToCopy;
+			nDone += nToCopy;
+		}
+
+	}
+
+	/* Update file object */
+
+	if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
+		in->variant.fileVariant.fileSize = (startOfWrite + nDone);
+	}
+
+	in->dirty = 1;
+
+	return nDone;
+}
+
+
+/* ---------------------- File resizing stuff ------------------ */
+
+static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
+{
+
+	yaffs_Device *dev = in->myDev;
+	int oldFileSize = in->variant.fileVariant.fileSize;
+
+	int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
+
+	int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
+	    dev->nDataBytesPerChunk;
+	int i;
+	int chunkId;
+
+	/* Delete backwards so that we don't end up with holes if
+	 * power is lost part-way through the operation.
+	 */
+	for (i = lastDel; i >= startDel; i--) {
+		/* NB this could be optimised somewhat,
+		 * eg. could retrieve the tags and write them without
+		 * using yaffs_DeleteChunk
+		 */
+
+		chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
+		if (chunkId > 0) {
+			if (chunkId <
+			    (dev->internalStartBlock * dev->nChunksPerBlock)
+			    || chunkId >=
+			    ((dev->internalEndBlock +
+			      1) * dev->nChunksPerBlock)) {
+				T(YAFFS_TRACE_ALWAYS,
+				  (TSTR("Found daft chunkId %d for %d" TENDSTR),
+				   chunkId, i));
+			} else {
+				in->nDataChunks--;
+				yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
+			}
+		}
+	}
+
+}
+
+int yaffs_ResizeFile(yaffs_Object * in, loff_t newSize)
+{
+
+	int oldFileSize = in->variant.fileVariant.fileSize;
+	int newSizeOfPartialChunk;
+	int newFullChunks;
+	
+	yaffs_Device *dev = in->myDev;
+
+	yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
+
+	yaffs_FlushFilesChunkCache(in);
+	yaffs_InvalidateWholeChunkCache(in);
+
+	yaffs_CheckGarbageCollection(dev);
+
+	if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
+		return yaffs_GetFileSize(in);
+	}
+
+	if (newSize == oldFileSize) {
+		return oldFileSize;
+	}
+
+	if (newSize < oldFileSize) {
+
+		yaffs_PruneResizedChunks(in, newSize);
+
+		if (newSizeOfPartialChunk != 0) {
+			int lastChunk = 1 + newFullChunks;
+			
+			__u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
+
+			/* Got to read and rewrite the last chunk with its new size and zero pad */
+			yaffs_ReadChunkDataFromObject(in, lastChunk,
+						      localBuffer);
+
+			memset(localBuffer + newSizeOfPartialChunk, 0,
+			       dev->nDataBytesPerChunk - newSizeOfPartialChunk);
+
+			yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
+						     newSizeOfPartialChunk, 1);
+
+			yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
+		}
+
+		in->variant.fileVariant.fileSize = newSize;
+
+		yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
+	} else {
+		/* newsSize > oldFileSize */
+		in->variant.fileVariant.fileSize = newSize;
+	}
+
+		
+	
+	/* Write a new object header.
+	 * show we've shrunk the file, if need be
+	 * Do this only if the file is not in the deleted directories.
+	 */
+	if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
+	    in->parent->objectId != YAFFS_OBJECTID_DELETED) {
+		yaffs_UpdateObjectHeader(in, NULL, 0,
+					 (newSize < oldFileSize) ? 1 : 0, 0);
+	}
+
+	return YAFFS_OK;
+}
+
+loff_t yaffs_GetFileSize(yaffs_Object * obj)
+{
+	obj = yaffs_GetEquivalentObject(obj);
+
+	switch (obj->variantType) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		return obj->variant.fileVariant.fileSize;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		return yaffs_strlen(obj->variant.symLinkVariant.alias);
+	default:
+		return 0;
+	}
+}
+
+
+
+int yaffs_FlushFile(yaffs_Object * in, int updateTime)
+{
+	int retVal;
+	if (in->dirty) {
+		yaffs_FlushFilesChunkCache(in);
+		if (updateTime) {
+#ifdef CONFIG_YAFFS_WINCE
+			yfsd_WinFileTimeNow(in->win_mtime);
+#else
+
+			in->yst_mtime = Y_CURRENT_TIME;
+
+#endif
+		}
+
+		retVal =
+		    (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
+		     0) ? YAFFS_OK : YAFFS_FAIL;
+	} else {
+		retVal = YAFFS_OK;
+	}
+
+	return retVal;
+
+}
+
+static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
+{
+
+	/* First off, invalidate the file's data in the cache, without flushing. */
+	yaffs_InvalidateWholeChunkCache(in);
+
+	if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
+		/* Move to the unlinked directory so we have a record that it was deleted. */
+		yaffs_ChangeObjectName(in, in->myDev->deletedDir,"deleted", 0, 0);
+
+	}
+
+	yaffs_RemoveObjectFromDirectory(in);
+	yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
+	in->chunkId = -1;
+
+	yaffs_FreeObject(in);
+	return YAFFS_OK;
+
+}
+
+/* yaffs_DeleteFile deletes the whole file data
+ * and the inode associated with the file.
+ * It does not delete the links associated with the file.
+ */
+static int yaffs_UnlinkFile(yaffs_Object * in)
+{
+
+	int retVal;
+	int immediateDeletion = 0;
+
+	if (1) {
+/* XXX U-BOOT XXX */
+#if 0
+#ifdef __KERNEL__
+		if (!in->myInode) {
+			immediateDeletion = 1;
+
+		}
+#endif
+#else
+		if (in->inUse <= 0) {
+			immediateDeletion = 1;
+
+		}
+#endif
+		if (immediateDeletion) {
+			retVal =
+			    yaffs_ChangeObjectName(in, in->myDev->deletedDir,
+						   "deleted", 0, 0);
+			T(YAFFS_TRACE_TRACING,
+			  (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
+			   in->objectId));
+			in->deleted = 1;
+			in->myDev->nDeletedFiles++;
+			if (0 && in->myDev->isYaffs2) {
+				yaffs_ResizeFile(in, 0);
+			}
+			yaffs_SoftDeleteFile(in);
+		} else {
+			retVal =
+			    yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
+						   "unlinked", 0, 0);
+		}
+
+	}
+	return retVal;
+}
+
+int yaffs_DeleteFile(yaffs_Object * in)
+{
+	int retVal = YAFFS_OK;
+
+	if (in->nDataChunks > 0) {
+		/* Use soft deletion if there is data in the file */
+		if (!in->unlinked) {
+			retVal = yaffs_UnlinkFile(in);
+		}
+		if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
+			in->deleted = 1;
+			in->myDev->nDeletedFiles++;
+			yaffs_SoftDeleteFile(in);
+		}
+		return in->deleted ? YAFFS_OK : YAFFS_FAIL;
+	} else {
+		/* The file has no data chunks so we toss it immediately */
+		yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
+		in->variant.fileVariant.top = NULL;
+		yaffs_DoGenericObjectDeletion(in);
+
+		return YAFFS_OK;
+	}
+}
+
+static int yaffs_DeleteDirectory(yaffs_Object * in)
+{
+	/* First check that the directory is empty. */
+	if (list_empty(&in->variant.directoryVariant.children)) {
+		return yaffs_DoGenericObjectDeletion(in);
+	}
+
+	return YAFFS_FAIL;
+
+}
+
+static int yaffs_DeleteSymLink(yaffs_Object * in)
+{
+	YFREE(in->variant.symLinkVariant.alias);
+
+	return yaffs_DoGenericObjectDeletion(in);
+}
+
+static int yaffs_DeleteHardLink(yaffs_Object * in)
+{
+	/* remove this hardlink from the list assocaited with the equivalent
+	 * object
+	 */
+	list_del(&in->hardLinks);
+	return yaffs_DoGenericObjectDeletion(in);
+}
+
+static void yaffs_DestroyObject(yaffs_Object * obj)
+{
+	switch (obj->variantType) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		yaffs_DeleteFile(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		yaffs_DeleteDirectory(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		yaffs_DeleteSymLink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		yaffs_DeleteHardLink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		yaffs_DoGenericObjectDeletion(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+		break;		/* should not happen. */
+	}
+}
+
+static int yaffs_UnlinkWorker(yaffs_Object * obj)
+{
+
+	if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
+		return yaffs_DeleteHardLink(obj);
+	} else if (!list_empty(&obj->hardLinks)) {
+		/* Curve ball: We're unlinking an object that has a hardlink.
+		 *
+		 * This problem arises because we are not strictly following
+		 * The Linux link/inode model.
+		 *
+		 * We can't really delete the object.
+		 * Instead, we do the following:
+		 * - Select a hardlink.
+		 * - Unhook it from the hard links
+		 * - Unhook it from its parent directory (so that the rename can work)
+		 * - Rename the object to the hardlink's name.
+		 * - Delete the hardlink
+		 */
+
+		yaffs_Object *hl;
+		int retVal;
+		YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
+
+		hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
+
+		list_del_init(&hl->hardLinks);
+		list_del_init(&hl->siblings);
+
+		yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
+
+		retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
+
+		if (retVal == YAFFS_OK) {
+			retVal = yaffs_DoGenericObjectDeletion(hl);
+		}
+		return retVal;
+
+	} else {
+		switch (obj->variantType) {
+		case YAFFS_OBJECT_TYPE_FILE:
+			return yaffs_UnlinkFile(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+			return yaffs_DeleteDirectory(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+			return yaffs_DeleteSymLink(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+			return yaffs_DoGenericObjectDeletion(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+		default:
+			return YAFFS_FAIL;
+		}
+	}
+}
+
+
+static int yaffs_UnlinkObject( yaffs_Object *obj)
+{
+
+	if (obj && obj->unlinkAllowed) {
+		return yaffs_UnlinkWorker(obj);
+	}
+
+	return YAFFS_FAIL;
+
+}
+int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
+{
+	yaffs_Object *obj;
+
+	obj = yaffs_FindObjectByName(dir, name);
+	return yaffs_UnlinkObject(obj);
+}
+
+/*----------------------- Initialisation Scanning ---------------------- */
+
+static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
+				       int backwardScanning)
+{
+	yaffs_Object *obj;
+
+	if (!backwardScanning) {
+		/* Handle YAFFS1 forward scanning case
+		 * For YAFFS1 we always do the deletion
+		 */
+
+	} else {
+		/* Handle YAFFS2 case (backward scanning)
+		 * If the shadowed object exists then ignore.
+		 */
+		if (yaffs_FindObjectByNumber(dev, objId)) {
+			return;
+		}
+	}
+
+	/* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
+	 * We put it in unlinked dir to be cleaned up after the scanning
+	 */
+	obj =
+	    yaffs_FindOrCreateObjectByNumber(dev, objId,
+					     YAFFS_OBJECT_TYPE_FILE);
+	yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
+	obj->variant.fileVariant.shrinkSize = 0;
+	obj->valid = 1;		/* So that we don't read any other info for this file */
+
+}
+
+typedef struct {
+	int seq;
+	int block;
+} yaffs_BlockIndex;
+
+
+static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
+{
+	yaffs_Object *hl;
+	yaffs_Object *in;
+	
+	while (hardList) {
+		hl = hardList;
+		hardList = (yaffs_Object *) (hardList->hardLinks.next);
+
+		in = yaffs_FindObjectByNumber(dev,
+					      hl->variant.hardLinkVariant.
+					      equivalentObjectId);
+
+		if (in) {
+			/* Add the hardlink pointers */
+			hl->variant.hardLinkVariant.equivalentObject = in;
+			list_add(&hl->hardLinks, &in->hardLinks);
+		} else {
+			/* Todo Need to report/handle this better.
+			 * Got a problem... hardlink to a non-existant object
+			 */
+			hl->variant.hardLinkVariant.equivalentObject = NULL;
+			INIT_LIST_HEAD(&hl->hardLinks);
+
+		}
+
+	}
+
+}
+
+
+
+
+
+static int ybicmp(const void *a, const void *b){
+    register int aseq = ((yaffs_BlockIndex *)a)->seq;
+    register int bseq = ((yaffs_BlockIndex *)b)->seq;
+    register int ablock = ((yaffs_BlockIndex *)a)->block;
+    register int bblock = ((yaffs_BlockIndex *)b)->block;
+    if( aseq == bseq )
+        return ablock - bblock;
+    else
+        return aseq - bseq;
+
+}
+
+static int yaffs_Scan(yaffs_Device * dev)
+{
+	yaffs_ExtendedTags tags;
+	int blk;
+	int blockIterator;
+	int startIterator;
+	int endIterator;
+	int nBlocksToScan = 0;
+	int result;
+
+	int chunk;
+	int c;
+	int deleted;
+	yaffs_BlockState state;
+	yaffs_Object *hardList = NULL;
+	yaffs_BlockInfo *bi;
+	int sequenceNumber;
+	yaffs_ObjectHeader *oh;
+	yaffs_Object *in;
+	yaffs_Object *parent;
+	int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
+	
+	int alloc_failed = 0;
+	
+
+	__u8 *chunkData;
+
+	yaffs_BlockIndex *blockIndex = NULL;
+
+	if (dev->isYaffs2) {
+		T(YAFFS_TRACE_SCAN,
+		  (TSTR("yaffs_Scan is not for YAFFS2!" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+	
+	//TODO  Throw all the yaffs2 stuuf out of yaffs_Scan since it is only for yaffs1 format.
+	
+	T(YAFFS_TRACE_SCAN,
+	  (TSTR("yaffs_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
+	   dev->internalStartBlock, dev->internalEndBlock));
+
+	chunkData = yaffs_GetTempBuffer(dev, __LINE__);
+
+	dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+	if (dev->isYaffs2) {
+		blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
+		if(!blockIndex)
+			return YAFFS_FAIL;
+	}
+
+	/* Scan all the blocks to determine their state */
+	for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
+		bi = yaffs_GetBlockInfo(dev, blk);
+		yaffs_ClearChunkBits(dev, blk);
+		bi->pagesInUse = 0;
+		bi->softDeletions = 0;
+
+		yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
+
+		bi->blockState = state;
+		bi->sequenceNumber = sequenceNumber;
+
+		T(YAFFS_TRACE_SCAN_DEBUG,
+		  (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
+		   state, sequenceNumber));
+
+		if (state == YAFFS_BLOCK_STATE_DEAD) {
+			T(YAFFS_TRACE_BAD_BLOCKS,
+			  (TSTR("block %d is bad" TENDSTR), blk));
+		} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
+			T(YAFFS_TRACE_SCAN_DEBUG,
+			  (TSTR("Block empty " TENDSTR)));
+			dev->nErasedBlocks++;
+			dev->nFreeChunks += dev->nChunksPerBlock;
+		} else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+
+			/* Determine the highest sequence number */
+			if (dev->isYaffs2 &&
+			    sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
+			    sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
+
+				blockIndex[nBlocksToScan].seq = sequenceNumber;
+				blockIndex[nBlocksToScan].block = blk;
+
+				nBlocksToScan++;
+
+				if (sequenceNumber >= dev->sequenceNumber) {
+					dev->sequenceNumber = sequenceNumber;
+				}
+			} else if (dev->isYaffs2) {
+				/* TODO: Nasty sequence number! */
+				T(YAFFS_TRACE_SCAN,
+				  (TSTR
+				   ("Block scanning block %d has bad sequence number %d"
+				    TENDSTR), blk, sequenceNumber));
+
+			}
+		}
+	}
+
+	/* Sort the blocks
+	 * Dungy old bubble sort for now...
+	 */
+	if (dev->isYaffs2) {
+		yaffs_BlockIndex temp;
+		int i;
+		int j;
+
+		for (i = 0; i < nBlocksToScan; i++)
+			for (j = i + 1; j < nBlocksToScan; j++)
+				if (blockIndex[i].seq > blockIndex[j].seq) {
+					temp = blockIndex[j];
+					blockIndex[j] = blockIndex[i];
+					blockIndex[i] = temp;
+				}
+	}
+
+	/* Now scan the blocks looking at the data. */
+	if (dev->isYaffs2) {
+		startIterator = 0;
+		endIterator = nBlocksToScan - 1;
+		T(YAFFS_TRACE_SCAN_DEBUG,
+		  (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
+	} else {
+		startIterator = dev->internalStartBlock;
+		endIterator = dev->internalEndBlock;
+	}
+
+	/* For each block.... */
+	for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
+	     blockIterator++) {
+
+		if (dev->isYaffs2) {
+			/* get the block to scan in the correct order */
+			blk = blockIndex[blockIterator].block;
+		} else {
+			blk = blockIterator;
+		}
+
+		bi = yaffs_GetBlockInfo(dev, blk);
+		state = bi->blockState;
+
+		deleted = 0;
+
+		/* For each chunk in each block that needs scanning....*/
+		for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
+		     state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
+			/* Read the tags and decide what to do */
+			chunk = blk * dev->nChunksPerBlock + c;
+
+			result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
+							&tags);
+
+			/* Let's have a good look at this chunk... */
+
+			if (!dev->isYaffs2 && tags.chunkDeleted) {
+				/* YAFFS1 only...
+				 * A deleted chunk
+				 */
+				deleted++;
+				dev->nFreeChunks++;
+				/*T((" %d %d deleted\n",blk,c)); */
+			} else if (!tags.chunkUsed) {
+				/* An unassigned chunk in the block
+				 * This means that either the block is empty or 
+				 * this is the one being allocated from
+				 */
+
+				if (c == 0) {
+					/* We're looking at the first chunk in the block so the block is unused */
+					state = YAFFS_BLOCK_STATE_EMPTY;
+					dev->nErasedBlocks++;
+				} else {
+					/* this is the block being allocated from */
+					T(YAFFS_TRACE_SCAN,
+					  (TSTR
+					   (" Allocating from %d %d" TENDSTR),
+					   blk, c));
+					state = YAFFS_BLOCK_STATE_ALLOCATING;
+					dev->allocationBlock = blk;
+					dev->allocationPage = c;
+					dev->allocationBlockFinder = blk;	
+					/* Set it to here to encourage the allocator to go forth from here. */
+					
+					/* Yaffs2 sanity check:
+					 * This should be the one with the highest sequence number
+					 */
+					if (dev->isYaffs2
+					    && (dev->sequenceNumber !=
+						bi->sequenceNumber)) {
+						T(YAFFS_TRACE_ALWAYS,
+						  (TSTR
+						   ("yaffs: Allocation block %d was not highest sequence id:"
+						    " block seq = %d, dev seq = %d"
+						    TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
+					}
+				}
+
+				dev->nFreeChunks += (dev->nChunksPerBlock - c);
+			} else if (tags.chunkId > 0) {
+				/* chunkId > 0 so it is a data chunk... */
+				unsigned int endpos;
+
+				yaffs_SetChunkBit(dev, blk, c);
+				bi->pagesInUse++;
+
+				in = yaffs_FindOrCreateObjectByNumber(dev,
+								      tags.
+								      objectId,
+								      YAFFS_OBJECT_TYPE_FILE);
+				/* PutChunkIntoFile checks for a clash (two data chunks with
+				 * the same chunkId).
+				 */
+				 
+				if(!in)
+					alloc_failed = 1;
+
+				if(in){
+					if(!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,1))
+						alloc_failed = 1;
+				}
+				
+				endpos =
+				    (tags.chunkId - 1) * dev->nDataBytesPerChunk +
+				    tags.byteCount;
+				if (in && 
+				    in->variantType == YAFFS_OBJECT_TYPE_FILE
+				    && in->variant.fileVariant.scannedFileSize <
+				    endpos) {
+					in->variant.fileVariant.
+					    scannedFileSize = endpos;
+					if (!dev->useHeaderFileSize) {
+						in->variant.fileVariant.
+						    fileSize =
+						    in->variant.fileVariant.
+						    scannedFileSize;
+					}
+
+				}
+				/* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));   */
+			} else {
+				/* chunkId == 0, so it is an ObjectHeader.
+				 * Thus, we read in the object header and make the object
+				 */
+				yaffs_SetChunkBit(dev, blk, c);
+				bi->pagesInUse++;
+
+				result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
+								chunkData,
+								NULL);
+
+				oh = (yaffs_ObjectHeader *) chunkData;
+
+				in = yaffs_FindObjectByNumber(dev,
+							      tags.objectId);
+				if (in && in->variantType != oh->type) {
+					/* This should not happen, but somehow
+					 * Wev'e ended up with an objectId that has been reused but not yet 
+					 * deleted, and worse still it has changed type. Delete the old object.
+					 */
+
+					yaffs_DestroyObject(in);
+
+					in = 0;
+				}
+
+				in = yaffs_FindOrCreateObjectByNumber(dev,
+								      tags.
+								      objectId,
+								      oh->type);
+
+				if(!in)
+					alloc_failed = 1;
+					
+				if (in && oh->shadowsObject > 0) {
+					yaffs_HandleShadowedObject(dev,
+								   oh->
+								   shadowsObject,
+								   0);
+				}
+
+				if (in && in->valid) {
+					/* We have already filled this one. We have a duplicate and need to resolve it. */
+
+					unsigned existingSerial = in->serial;
+					unsigned newSerial = tags.serialNumber;
+
+					if (dev->isYaffs2 ||
+					    ((existingSerial + 1) & 3) ==
+					    newSerial) {
+						/* Use new one - destroy the exisiting one */
+						yaffs_DeleteChunk(dev,
+								  in->chunkId,
+								  1, __LINE__);
+						in->valid = 0;
+					} else {
+						/* Use existing - destroy this one. */
+						yaffs_DeleteChunk(dev, chunk, 1,
+								  __LINE__);
+					}
+				}
+
+				if (in && !in->valid &&
+				    (tags.objectId == YAFFS_OBJECTID_ROOT ||
+				     tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
+					/* We only load some info, don't fiddle with directory structure */
+					in->valid = 1;
+					in->variantType = oh->type;
+
+					in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+					in->win_atime[0] = oh->win_atime[0];
+					in->win_ctime[0] = oh->win_ctime[0];
+					in->win_mtime[0] = oh->win_mtime[0];
+					in->win_atime[1] = oh->win_atime[1];
+					in->win_ctime[1] = oh->win_ctime[1];
+					in->win_mtime[1] = oh->win_mtime[1];
+#else
+					in->yst_uid = oh->yst_uid;
+					in->yst_gid = oh->yst_gid;
+					in->yst_atime = oh->yst_atime;
+					in->yst_mtime = oh->yst_mtime;
+					in->yst_ctime = oh->yst_ctime;
+					in->yst_rdev = oh->yst_rdev;
+#endif
+					in->chunkId = chunk;
+
+				} else if (in && !in->valid) {
+					/* we need to load this info */
+
+					in->valid = 1;
+					in->variantType = oh->type;
+
+					in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+					in->win_atime[0] = oh->win_atime[0];
+					in->win_ctime[0] = oh->win_ctime[0];
+					in->win_mtime[0] = oh->win_mtime[0];
+					in->win_atime[1] = oh->win_atime[1];
+					in->win_ctime[1] = oh->win_ctime[1];
+					in->win_mtime[1] = oh->win_mtime[1];
+#else
+					in->yst_uid = oh->yst_uid;
+					in->yst_gid = oh->yst_gid;
+					in->yst_atime = oh->yst_atime;
+					in->yst_mtime = oh->yst_mtime;
+					in->yst_ctime = oh->yst_ctime;
+					in->yst_rdev = oh->yst_rdev;
+#endif
+					in->chunkId = chunk;
+
+					yaffs_SetObjectName(in, oh->name);
+					in->dirty = 0;
+
+					/* directory stuff...
+					 * hook up to parent
+					 */
+
+					parent =
+					    yaffs_FindOrCreateObjectByNumber
+					    (dev, oh->parentObjectId,
+					     YAFFS_OBJECT_TYPE_DIRECTORY);
+					if (parent->variantType ==
+					    YAFFS_OBJECT_TYPE_UNKNOWN) {
+						/* Set up as a directory */
+						parent->variantType =
+						    YAFFS_OBJECT_TYPE_DIRECTORY;
+						INIT_LIST_HEAD(&parent->variant.
+							       directoryVariant.
+							       children);
+					} else if (parent->variantType !=
+						   YAFFS_OBJECT_TYPE_DIRECTORY)
+					{
+						/* Hoosterman, another problem....
+						 * We're trying to use a non-directory as a directory
+						 */
+
+						T(YAFFS_TRACE_ERROR,
+						  (TSTR
+						   ("yaffs tragedy: attempting to use non-directory as"
+						    " a directory in scan. Put in lost+found."
+						    TENDSTR)));
+						parent = dev->lostNFoundDir;
+					}
+
+					yaffs_AddObjectToDirectory(parent, in);
+
+					if (0 && (parent == dev->deletedDir ||
+						  parent == dev->unlinkedDir)) {
+						in->deleted = 1;	/* If it is unlinked at start up then it wants deleting */
+						dev->nDeletedFiles++;
+					}
+					/* Note re hardlinks.
+					 * Since we might scan a hardlink before its equivalent object is scanned
+					 * we put them all in a list.
+					 * After scanning is complete, we should have all the objects, so we run through this
+					 * list and fix up all the chains.              
+					 */
+
+					switch (in->variantType) {
+					case YAFFS_OBJECT_TYPE_UNKNOWN:	
+						/* Todo got a problem */
+						break;
+					case YAFFS_OBJECT_TYPE_FILE:
+						if (dev->isYaffs2
+						    && oh->isShrink) {
+							/* Prune back the shrunken chunks */
+							yaffs_PruneResizedChunks
+							    (in, oh->fileSize);
+							/* Mark the block as having a shrinkHeader */
+							bi->hasShrinkHeader = 1;
+						}
+
+						if (dev->useHeaderFileSize)
+
+							in->variant.fileVariant.
+							    fileSize =
+							    oh->fileSize;
+
+						break;
+					case YAFFS_OBJECT_TYPE_HARDLINK:
+						in->variant.hardLinkVariant.
+						    equivalentObjectId =
+						    oh->equivalentObjectId;
+						in->hardLinks.next =
+						    (struct list_head *)
+						    hardList;
+						hardList = in;
+						break;
+					case YAFFS_OBJECT_TYPE_DIRECTORY:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SPECIAL:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SYMLINK:	
+						in->variant.symLinkVariant.alias =
+						    yaffs_CloneString(oh->alias);
+						if(!in->variant.symLinkVariant.alias)
+							alloc_failed = 1;
+						break;
+					}
+
+					if (parent == dev->deletedDir) {
+						yaffs_DestroyObject(in);
+						bi->hasShrinkHeader = 1;
+					}
+				}
+			}
+		}
+
+		if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+			/* If we got this far while scanning, then the block is fully allocated.*/
+			state = YAFFS_BLOCK_STATE_FULL;
+		}
+
+		bi->blockState = state;
+
+		/* Now let's see if it was dirty */
+		if (bi->pagesInUse == 0 &&
+		    !bi->hasShrinkHeader &&
+		    bi->blockState == YAFFS_BLOCK_STATE_FULL) {
+			yaffs_BlockBecameDirty(dev, blk);
+		}
+
+	}
+
+	if (blockIndex) {
+		YFREE(blockIndex);
+	}
+	
+	
+	/* Ok, we've done all the scanning.
+	 * Fix up the hard link chains.
+	 * We should now have scanned all the objects, now it's time to add these 
+	 * hardlinks.
+	 */
+
+	yaffs_HardlinkFixup(dev,hardList);
+
+	/* Handle the unlinked files. Since they were left in an unlinked state we should
+	 * just delete them.
+	 */
+	{
+		struct list_head *i;
+		struct list_head *n;
+
+		yaffs_Object *l;
+		/* Soft delete all the unlinked files */
+		list_for_each_safe(i, n,
+				   &dev->unlinkedDir->variant.directoryVariant.
+				   children) {
+			if (i) {
+				l = list_entry(i, yaffs_Object, siblings);
+				yaffs_DestroyObject(l);
+			}
+		}
+	}
+
+	yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
+
+	if(alloc_failed){
+		return YAFFS_FAIL;
+	}
+	
+	T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
+	
+
+	return YAFFS_OK;
+}
+
+static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
+{
+	__u8 *chunkData;
+	yaffs_ObjectHeader *oh;
+	yaffs_Device *dev = in->myDev;
+	yaffs_ExtendedTags tags;
+	int result;
+	int alloc_failed = 0;
+
+	if(!in)
+		return;
+		
+#if 0
+	T(YAFFS_TRACE_SCAN,(TSTR("details for object %d %s loaded" TENDSTR),
+		in->objectId,
+		in->lazyLoaded ? "not yet" : "already"));
+#endif
+
+	if(in->lazyLoaded){
+		in->lazyLoaded = 0;
+		chunkData = yaffs_GetTempBuffer(dev, __LINE__);
+
+		result = yaffs_ReadChunkWithTagsFromNAND(dev,in->chunkId,chunkData,&tags);
+		oh = (yaffs_ObjectHeader *) chunkData;		
+
+		in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+		in->win_atime[0] = oh->win_atime[0];
+		in->win_ctime[0] = oh->win_ctime[0];
+		in->win_mtime[0] = oh->win_mtime[0];
+		in->win_atime[1] = oh->win_atime[1];
+		in->win_ctime[1] = oh->win_ctime[1];
+		in->win_mtime[1] = oh->win_mtime[1];
+#else
+		in->yst_uid = oh->yst_uid;
+		in->yst_gid = oh->yst_gid;
+		in->yst_atime = oh->yst_atime;
+		in->yst_mtime = oh->yst_mtime;
+		in->yst_ctime = oh->yst_ctime;
+		in->yst_rdev = oh->yst_rdev;
+		
+#endif
+		yaffs_SetObjectName(in, oh->name);
+		
+		if(in->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
+			 in->variant.symLinkVariant.alias =
+						    yaffs_CloneString(oh->alias);
+			if(!in->variant.symLinkVariant.alias)
+				alloc_failed = 1; /* Not returned to caller */
+		}
+						    
+		yaffs_ReleaseTempBuffer(dev,chunkData, __LINE__);
+	}
+}
+
+static int yaffs_ScanBackwards(yaffs_Device * dev)
+{
+	yaffs_ExtendedTags tags;
+	int blk;
+	int blockIterator;
+	int startIterator;
+	int endIterator;
+	int nBlocksToScan = 0;
+
+	int chunk;
+	int result;
+	int c;
+	int deleted;
+	yaffs_BlockState state;
+	yaffs_Object *hardList = NULL;
+	yaffs_BlockInfo *bi;
+	int sequenceNumber;
+	yaffs_ObjectHeader *oh;
+	yaffs_Object *in;
+	yaffs_Object *parent;
+	int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
+	int itsUnlinked;
+	__u8 *chunkData;
+	
+	int fileSize;
+	int isShrink;
+	int foundChunksInBlock;
+	int equivalentObjectId;
+	int alloc_failed = 0;
+	
+
+	yaffs_BlockIndex *blockIndex = NULL;
+	int altBlockIndex = 0;
+
+	if (!dev->isYaffs2) {
+		T(YAFFS_TRACE_SCAN,
+		  (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	T(YAFFS_TRACE_SCAN,
+	  (TSTR
+	   ("yaffs_ScanBackwards starts  intstartblk %d intendblk %d..."
+	    TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
+
+
+	dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+	blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
+	
+	if(!blockIndex) {
+		blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
+		altBlockIndex = 1;
+	}
+	
+	if(!blockIndex) {
+		T(YAFFS_TRACE_SCAN,
+		  (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+	
+	dev->blocksInCheckpoint = 0;
+	
+	chunkData = yaffs_GetTempBuffer(dev, __LINE__);
+
+	/* Scan all the blocks to determine their state */
+	for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
+		bi = yaffs_GetBlockInfo(dev, blk);
+		yaffs_ClearChunkBits(dev, blk);
+		bi->pagesInUse = 0;
+		bi->softDeletions = 0;
+
+		yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
+
+		bi->blockState = state;
+		bi->sequenceNumber = sequenceNumber;
+
+		if(bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
+			bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
+			
+		T(YAFFS_TRACE_SCAN_DEBUG,
+		  (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
+		   state, sequenceNumber));
+
+		
+		if(state == YAFFS_BLOCK_STATE_CHECKPOINT){
+			dev->blocksInCheckpoint++;
+			
+		} else if (state == YAFFS_BLOCK_STATE_DEAD) {
+			T(YAFFS_TRACE_BAD_BLOCKS,
+			  (TSTR("block %d is bad" TENDSTR), blk));
+		} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
+			T(YAFFS_TRACE_SCAN_DEBUG,
+			  (TSTR("Block empty " TENDSTR)));
+			dev->nErasedBlocks++;
+			dev->nFreeChunks += dev->nChunksPerBlock;
+		} else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+
+			/* Determine the highest sequence number */
+			if (dev->isYaffs2 &&
+			    sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
+			    sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
+
+				blockIndex[nBlocksToScan].seq = sequenceNumber;
+				blockIndex[nBlocksToScan].block = blk;
+
+				nBlocksToScan++;
+
+				if (sequenceNumber >= dev->sequenceNumber) {
+					dev->sequenceNumber = sequenceNumber;
+				}
+			} else if (dev->isYaffs2) {
+				/* TODO: Nasty sequence number! */
+				T(YAFFS_TRACE_SCAN,
+				  (TSTR
+				   ("Block scanning block %d has bad sequence number %d"
+				    TENDSTR), blk, sequenceNumber));
+
+			}
+		}
+	}
+
+	T(YAFFS_TRACE_SCAN,
+	(TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
+
+
+
+	YYIELD();
+
+	/* Sort the blocks */
+#ifndef CONFIG_YAFFS_USE_OWN_SORT
+	{
+		/* Use qsort now. */
+		yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
+	}
+#else
+	{
+	 	/* Dungy old bubble sort... */
+	 	
+		yaffs_BlockIndex temp;
+		int i;
+		int j;
+
+		for (i = 0; i < nBlocksToScan; i++)
+			for (j = i + 1; j < nBlocksToScan; j++)
+				if (blockIndex[i].seq > blockIndex[j].seq) {
+					temp = blockIndex[j];
+					blockIndex[j] = blockIndex[i];
+					blockIndex[i] = temp;
+				}
+	}
+#endif
+
+	YYIELD();
+
+    	T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
+
+	/* Now scan the blocks looking at the data. */
+	startIterator = 0;
+	endIterator = nBlocksToScan - 1;
+	T(YAFFS_TRACE_SCAN_DEBUG,
+	  (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
+
+	/* For each block.... backwards */
+	for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
+	     blockIterator--) {
+	        /* Cooperative multitasking! This loop can run for so
+		   long that watchdog timers expire. */
+	        YYIELD();
+
+		/* get the block to scan in the correct order */
+		blk = blockIndex[blockIterator].block;
+
+		bi = yaffs_GetBlockInfo(dev, blk);
+		
+		
+		state = bi->blockState;
+
+		deleted = 0;
+
+		/* For each chunk in each block that needs scanning.... */
+		foundChunksInBlock = 0;
+		for (c = dev->nChunksPerBlock - 1; 
+		     !alloc_failed && c >= 0 &&
+		     (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+		      state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
+			/* Scan backwards... 
+			 * Read the tags and decide what to do
+			 */
+			
+			chunk = blk * dev->nChunksPerBlock + c;
+
+			result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
+							&tags);
+
+			/* Let's have a good look at this chunk... */
+
+			if (!tags.chunkUsed) {
+				/* An unassigned chunk in the block.
+				 * If there are used chunks after this one, then
+				 * it is a chunk that was skipped due to failing the erased
+				 * check. Just skip it so that it can be deleted.
+				 * But, more typically, We get here when this is an unallocated
+				 * chunk and his means that either the block is empty or 
+				 * this is the one being allocated from
+				 */
+
+				if(foundChunksInBlock)
+				{
+					/* This is a chunk that was skipped due to failing the erased check */
+					
+				} else if (c == 0) {
+					/* We're looking at the first chunk in the block so the block is unused */
+					state = YAFFS_BLOCK_STATE_EMPTY;
+					dev->nErasedBlocks++;
+				} else {
+					if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+					    state == YAFFS_BLOCK_STATE_ALLOCATING) {
+					    	if(dev->sequenceNumber == bi->sequenceNumber) {
+							/* this is the block being allocated from */
+					    	
+							T(YAFFS_TRACE_SCAN,
+							  (TSTR
+							   (" Allocating from %d %d"
+							    TENDSTR), blk, c));
+
+							state = YAFFS_BLOCK_STATE_ALLOCATING;
+							dev->allocationBlock = blk;
+							dev->allocationPage = c;
+							dev->allocationBlockFinder = blk;	
+						}
+						else {
+							/* This is a partially written block that is not
+							 * the current allocation block. This block must have
+							 * had a write failure, so set up for retirement.
+							 */
+						  
+							 bi->needsRetiring = 1;
+							 bi->gcPrioritise = 1;
+							 						 
+							 T(YAFFS_TRACE_ALWAYS,
+							 (TSTR("Partially written block %d being set for retirement" TENDSTR),
+							 blk));
+						}
+
+					}
+					 
+				}
+
+				dev->nFreeChunks++;
+				
+			} else if (tags.chunkId > 0) {
+				/* chunkId > 0 so it is a data chunk... */
+				unsigned int endpos;
+				__u32 chunkBase =
+				    (tags.chunkId - 1) * dev->nDataBytesPerChunk;
+								
+				foundChunksInBlock = 1;
+
+
+				yaffs_SetChunkBit(dev, blk, c);
+				bi->pagesInUse++;
+
+				in = yaffs_FindOrCreateObjectByNumber(dev,
+								      tags.
+								      objectId,
+								      YAFFS_OBJECT_TYPE_FILE);
+				if(!in){
+					/* Out of memory */
+					alloc_failed = 1;
+				}
+				
+				if (in &&
+				    in->variantType == YAFFS_OBJECT_TYPE_FILE
+				    && chunkBase <
+				    in->variant.fileVariant.shrinkSize) {
+					/* This has not been invalidated by a resize */
+					if(!yaffs_PutChunkIntoFile(in, tags.chunkId,
+							       chunk, -1)){
+						alloc_failed = 1;
+					}
+
+					/* File size is calculated by looking at the data chunks if we have not 
+					 * seen an object header yet. Stop this practice once we find an object header.
+					 */
+					endpos =
+					    (tags.chunkId -
+					     1) * dev->nDataBytesPerChunk +
+					    tags.byteCount;
+					    
+					if (!in->valid &&	/* have not got an object header yet */
+					    in->variant.fileVariant.
+					    scannedFileSize < endpos) {
+						in->variant.fileVariant.
+						    scannedFileSize = endpos;
+						in->variant.fileVariant.
+						    fileSize =
+						    in->variant.fileVariant.
+						    scannedFileSize;
+					}
+
+				} else if(in) {
+					/* This chunk has been invalidated by a resize, so delete */
+					yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
+
+				}
+			} else {
+				/* chunkId == 0, so it is an ObjectHeader.
+				 * Thus, we read in the object header and make the object
+				 */
+				foundChunksInBlock = 1;
+
+				yaffs_SetChunkBit(dev, blk, c);
+				bi->pagesInUse++;
+
+				oh = NULL;
+				in = NULL;
+
+				if (tags.extraHeaderInfoAvailable) {
+					in = yaffs_FindOrCreateObjectByNumber
+					    (dev, tags.objectId,
+					     tags.extraObjectType);
+				}
+
+				if (!in ||
+#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
+				    !in->valid ||
+#endif
+				    tags.extraShadows ||
+				    (!in->valid &&
+				    (tags.objectId == YAFFS_OBJECTID_ROOT ||
+				     tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
+				    ) {
+
+					/* If we don't have  valid info then we need to read the chunk
+					 * TODO In future we can probably defer reading the chunk and 
+					 * living with invalid data until needed.
+					 */
+
+					result = yaffs_ReadChunkWithTagsFromNAND(dev,
+									chunk,
+									chunkData,
+									NULL);
+
+					oh = (yaffs_ObjectHeader *) chunkData;
+
+					if (!in)
+						in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
+
+				}
+
+				if (!in) {
+					/* TODO Hoosterman we have a problem! */
+					T(YAFFS_TRACE_ERROR,
+					  (TSTR
+					   ("yaffs tragedy: Could not make object for object  %d  "
+					    "at chunk %d during scan"
+					    TENDSTR), tags.objectId, chunk));
+
+				}
+
+				if (in->valid) {
+					/* We have already filled this one.
+					 * We have a duplicate that will be discarded, but 
+					 * we first have to suck out resize info if it is a file.
+					 */
+
+					if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) && 
+					     ((oh && 
+					       oh-> type == YAFFS_OBJECT_TYPE_FILE)||
+					      (tags.extraHeaderInfoAvailable  &&
+					       tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
+					    ) {
+						__u32 thisSize =
+						    (oh) ? oh->fileSize : tags.
+						    extraFileLength;
+						__u32 parentObjectId =
+						    (oh) ? oh->
+						    parentObjectId : tags.
+						    extraParentObjectId;
+						unsigned isShrink =
+						    (oh) ? oh->isShrink : tags.
+						    extraIsShrinkHeader;
+
+						/* If it is deleted (unlinked at start also means deleted)
+						 * we treat the file size as being zeroed at this point.
+						 */
+						if (parentObjectId ==
+						    YAFFS_OBJECTID_DELETED
+						    || parentObjectId ==
+						    YAFFS_OBJECTID_UNLINKED) {
+							thisSize = 0;
+							isShrink = 1;
+						}
+
+						if (isShrink &&
+						    in->variant.fileVariant.
+						    shrinkSize > thisSize) {
+							in->variant.fileVariant.
+							    shrinkSize =
+							    thisSize;
+						}
+
+						if (isShrink) {
+							bi->hasShrinkHeader = 1;
+						}
+
+					}
+					/* Use existing - destroy this one. */
+					yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
+
+				}
+
+				if (!in->valid &&
+				    (tags.objectId == YAFFS_OBJECTID_ROOT ||
+				     tags.objectId ==
+				     YAFFS_OBJECTID_LOSTNFOUND)) {
+					/* We only load some info, don't fiddle with directory structure */
+					in->valid = 1;
+					
+					if(oh) {
+						in->variantType = oh->type;
+
+						in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+						in->win_atime[0] = oh->win_atime[0];
+						in->win_ctime[0] = oh->win_ctime[0];
+						in->win_mtime[0] = oh->win_mtime[0];
+						in->win_atime[1] = oh->win_atime[1];
+						in->win_ctime[1] = oh->win_ctime[1];
+						in->win_mtime[1] = oh->win_mtime[1];
+#else
+						in->yst_uid = oh->yst_uid;
+						in->yst_gid = oh->yst_gid;
+						in->yst_atime = oh->yst_atime;
+						in->yst_mtime = oh->yst_mtime;
+						in->yst_ctime = oh->yst_ctime;
+						in->yst_rdev = oh->yst_rdev;
+		
+#endif
+					} else {
+						in->variantType = tags.extraObjectType;
+						in->lazyLoaded = 1;
+					}
+						
+					in->chunkId = chunk;
+
+				} else if (!in->valid) {
+					/* we need to load this info */
+
+					in->valid = 1;
+					in->chunkId = chunk;
+					
+					if(oh) {
+						in->variantType = oh->type;
+
+						in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+						in->win_atime[0] = oh->win_atime[0];
+						in->win_ctime[0] = oh->win_ctime[0];
+						in->win_mtime[0] = oh->win_mtime[0];
+						in->win_atime[1] = oh->win_atime[1];
+						in->win_ctime[1] = oh->win_ctime[1];
+						in->win_mtime[1] = oh->win_mtime[1];
+#else
+						in->yst_uid = oh->yst_uid;
+						in->yst_gid = oh->yst_gid;
+						in->yst_atime = oh->yst_atime;
+						in->yst_mtime = oh->yst_mtime;
+						in->yst_ctime = oh->yst_ctime;
+						in->yst_rdev = oh->yst_rdev;
+#endif
+
+						if (oh->shadowsObject > 0) 
+							yaffs_HandleShadowedObject(dev,
+									   oh->
+									   shadowsObject,
+									   1);
+					
+
+						yaffs_SetObjectName(in, oh->name);
+						parent =
+						    yaffs_FindOrCreateObjectByNumber
+					    		(dev, oh->parentObjectId,
+					     		 YAFFS_OBJECT_TYPE_DIRECTORY);
+
+						 fileSize = oh->fileSize;
+ 						 isShrink = oh->isShrink;
+						 equivalentObjectId = oh->equivalentObjectId;
+
+					}
+					else {
+						in->variantType = tags.extraObjectType;
+						parent =
+						    yaffs_FindOrCreateObjectByNumber
+					    		(dev, tags.extraParentObjectId,
+					     		 YAFFS_OBJECT_TYPE_DIRECTORY);
+						 fileSize = tags.extraFileLength;
+						 isShrink = tags.extraIsShrinkHeader;
+						 equivalentObjectId = tags.extraEquivalentObjectId;
+						in->lazyLoaded = 1;
+
+					}
+					in->dirty = 0;
+
+					/* directory stuff...
+					 * hook up to parent
+					 */
+
+					if (parent->variantType ==
+					    YAFFS_OBJECT_TYPE_UNKNOWN) {
+						/* Set up as a directory */
+						parent->variantType =
+						    YAFFS_OBJECT_TYPE_DIRECTORY;
+						INIT_LIST_HEAD(&parent->variant.
+							       directoryVariant.
+							       children);
+					} else if (parent->variantType !=
+						   YAFFS_OBJECT_TYPE_DIRECTORY)
+					{
+						/* Hoosterman, another problem....
+						 * We're trying to use a non-directory as a directory
+						 */
+
+						T(YAFFS_TRACE_ERROR,
+						  (TSTR
+						   ("yaffs tragedy: attempting to use non-directory as"
+						    " a directory in scan. Put in lost+found."
+						    TENDSTR)));
+						parent = dev->lostNFoundDir;
+					}
+
+					yaffs_AddObjectToDirectory(parent, in);
+
+					itsUnlinked = (parent == dev->deletedDir) ||
+						      (parent == dev->unlinkedDir);
+
+					if (isShrink) {
+						/* Mark the block as having a shrinkHeader */
+						bi->hasShrinkHeader = 1;
+					}
+
+					/* Note re hardlinks.
+					 * Since we might scan a hardlink before its equivalent object is scanned
+					 * we put them all in a list.
+					 * After scanning is complete, we should have all the objects, so we run
+					 * through this list and fix up all the chains.              
+					 */
+
+					switch (in->variantType) {
+					case YAFFS_OBJECT_TYPE_UNKNOWN:	
+						/* Todo got a problem */
+						break;
+					case YAFFS_OBJECT_TYPE_FILE:
+
+						if (in->variant.fileVariant.
+						    scannedFileSize < fileSize) {
+							/* This covers the case where the file size is greater
+							 * than where the data is
+							 * This will happen if the file is resized to be larger 
+							 * than its current data extents.
+							 */
+							in->variant.fileVariant.fileSize = fileSize;
+							in->variant.fileVariant.scannedFileSize =
+							    in->variant.fileVariant.fileSize;
+						}
+
+						if (isShrink &&
+						    in->variant.fileVariant.shrinkSize > fileSize) {
+							in->variant.fileVariant.shrinkSize = fileSize;
+						}
+
+						break;
+					case YAFFS_OBJECT_TYPE_HARDLINK:
+						if(!itsUnlinked) {
+						  in->variant.hardLinkVariant.equivalentObjectId =
+						    equivalentObjectId;
+						  in->hardLinks.next =
+						    (struct list_head *) hardList;
+						  hardList = in;
+						}
+						break;
+					case YAFFS_OBJECT_TYPE_DIRECTORY:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SPECIAL:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SYMLINK:
+						if(oh){
+						   in->variant.symLinkVariant.alias =
+						    yaffs_CloneString(oh->
+								      alias);
+						   if(!in->variant.symLinkVariant.alias)
+						   	alloc_failed = 1;
+						}
+						break;
+					}
+
+				}
+				
+			}
+
+		} /* End of scanning for each chunk */
+
+		if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+			/* If we got this far while scanning, then the block is fully allocated. */
+			state = YAFFS_BLOCK_STATE_FULL;
+		}
+
+		bi->blockState = state;
+
+		/* Now let's see if it was dirty */
+		if (bi->pagesInUse == 0 &&
+		    !bi->hasShrinkHeader &&
+		    bi->blockState == YAFFS_BLOCK_STATE_FULL) {
+			yaffs_BlockBecameDirty(dev, blk);
+		}
+
+	}
+
+	if (altBlockIndex) 
+		YFREE_ALT(blockIndex);
+	else
+		YFREE(blockIndex);
+	
+	/* Ok, we've done all the scanning.
+	 * Fix up the hard link chains.
+	 * We should now have scanned all the objects, now it's time to add these 
+	 * hardlinks.
+	 */
+	yaffs_HardlinkFixup(dev,hardList);
+	
+	
+	/*
+	*  Sort out state of unlinked and deleted objects.
+	*/
+	{
+		struct list_head *i;
+		struct list_head *n;
+
+		yaffs_Object *l;
+
+		/* Soft delete all the unlinked files */
+		list_for_each_safe(i, n,
+				   &dev->unlinkedDir->variant.directoryVariant.
+				   children) {
+			if (i) {
+				l = list_entry(i, yaffs_Object, siblings);
+				yaffs_DestroyObject(l);
+			}
+		}
+
+		/* Soft delete all the deletedDir files */
+		list_for_each_safe(i, n,
+				   &dev->deletedDir->variant.directoryVariant.
+				   children) {
+			if (i) {
+				l = list_entry(i, yaffs_Object, siblings);
+				yaffs_DestroyObject(l);
+
+			}
+		}
+	}
+
+	yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
+	
+	if(alloc_failed){
+		return YAFFS_FAIL;
+	}
+
+	T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
+
+	return YAFFS_OK;
+}
+
+/*------------------------------  Directory Functions ----------------------------- */
+
+static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
+{
+	yaffs_Device *dev = obj->myDev;
+	
+	if(dev && dev->removeObjectCallback)
+		dev->removeObjectCallback(obj);
+	   
+	list_del_init(&obj->siblings);
+	obj->parent = NULL;
+}
+
+
+static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
+				       yaffs_Object * obj)
+{
+
+	if (!directory) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: Trying to add an object to a null pointer directory"
+		    TENDSTR)));
+		YBUG();
+	}
+	if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: Trying to add an object to a non-directory"
+		    TENDSTR)));
+		YBUG();
+	}
+
+	if (obj->siblings.prev == NULL) {
+		/* Not initialised */
+		INIT_LIST_HEAD(&obj->siblings);
+
+	} else if (!list_empty(&obj->siblings)) {
+		/* If it is holed up somewhere else, un hook it */
+		yaffs_RemoveObjectFromDirectory(obj);
+	}
+	/* Now add it */
+	list_add(&obj->siblings, &directory->variant.directoryVariant.children);
+	obj->parent = directory;
+
+	if (directory == obj->myDev->unlinkedDir
+	    || directory == obj->myDev->deletedDir) {
+		obj->unlinked = 1;
+		obj->myDev->nUnlinkedFiles++;
+		obj->renameAllowed = 0;
+	}
+}
+
+yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
+				     const YCHAR * name)
+{
+	int sum;
+
+	struct list_head *i;
+	YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
+
+	yaffs_Object *l;
+
+	if (!name) {
+		return NULL;
+	}
+
+	if (!directory) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: yaffs_FindObjectByName: null pointer directory"
+		    TENDSTR)));
+		YBUG();
+	}
+	if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
+		YBUG();
+	}
+
+	sum = yaffs_CalcNameSum(name);
+
+	list_for_each(i, &directory->variant.directoryVariant.children) {
+		if (i) {
+			l = list_entry(i, yaffs_Object, siblings);
+			
+			yaffs_CheckObjectDetailsLoaded(l);
+
+			/* Special case for lost-n-found */
+			if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
+				if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
+					return l;
+				}
+			} else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)	
+			{
+				/* LostnFound cunk called Objxxx
+				 * Do a real check
+				 */
+				yaffs_GetObjectName(l, buffer,
+						    YAFFS_MAX_NAME_LENGTH);
+				if (yaffs_strncmp(name, buffer,YAFFS_MAX_NAME_LENGTH) == 0) {
+					return l;
+				}
+
+			}
+		}
+	}
+
+	return NULL;
+}
+
+
+#if 0
+int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
+				   int (*fn) (yaffs_Object *))
+{
+	struct list_head *i;
+	yaffs_Object *l;
+
+	if (!theDir) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: yaffs_FindObjectByName: null pointer directory"
+		    TENDSTR)));
+		YBUG();
+	}
+	if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
+		YBUG();
+	}
+
+	list_for_each(i, &theDir->variant.directoryVariant.children) {
+		if (i) {
+			l = list_entry(i, yaffs_Object, siblings);
+			if (l && !fn(l)) {
+				return YAFFS_FAIL;
+			}
+		}
+	}
+
+	return YAFFS_OK;
+
+}
+#endif
+
+/* GetEquivalentObject dereferences any hard links to get to the
+ * actual object.
+ */
+
+yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
+{
+	if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
+		/* We want the object id of the equivalent object, not this one */
+		obj = obj->variant.hardLinkVariant.equivalentObject;
+		yaffs_CheckObjectDetailsLoaded(obj);
+	}
+	return obj;
+
+}
+
+int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
+{
+	memset(name, 0, buffSize * sizeof(YCHAR));
+	
+	yaffs_CheckObjectDetailsLoaded(obj);
+
+	if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
+		yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
+	} else if (obj->chunkId <= 0) {
+		YCHAR locName[20];
+		/* make up a name */
+		yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
+			      obj->objectId);
+		yaffs_strncpy(name, locName, buffSize - 1);
+
+	}
+#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
+	else if (obj->shortName[0]) {
+		yaffs_strcpy(name, obj->shortName);
+	}
+#endif
+	else {
+		int result;
+		__u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
+
+		yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
+
+		memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
+
+		if (obj->chunkId >= 0) {
+			result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
+							obj->chunkId, buffer,
+							NULL);
+		}
+		yaffs_strncpy(name, oh->name, buffSize - 1);
+
+		yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
+	}
+
+	return yaffs_strlen(name);
+}
+
+int yaffs_GetObjectFileLength(yaffs_Object * obj)
+{
+
+	/* Dereference any hard linking */
+	obj = yaffs_GetEquivalentObject(obj);
+
+	if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
+		return obj->variant.fileVariant.fileSize;
+	}
+	if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
+		return yaffs_strlen(obj->variant.symLinkVariant.alias);
+	} else {
+		/* Only a directory should drop through to here */
+		return obj->myDev->nDataBytesPerChunk;
+	}
+}
+
+int yaffs_GetObjectLinkCount(yaffs_Object * obj)
+{
+	int count = 0;
+	struct list_head *i;
+
+	if (!obj->unlinked) {
+		count++;	/* the object itself */
+	}
+	list_for_each(i, &obj->hardLinks) {
+		count++;	/* add the hard links; */
+	}
+	return count;
+
+}
+
+int yaffs_GetObjectInode(yaffs_Object * obj)
+{
+	obj = yaffs_GetEquivalentObject(obj);
+
+	return obj->objectId;
+}
+
+unsigned yaffs_GetObjectType(yaffs_Object * obj)
+{
+	obj = yaffs_GetEquivalentObject(obj);
+
+	switch (obj->variantType) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		return DT_REG;
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		return DT_DIR;
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		return DT_LNK;
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		return DT_REG;
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		if (S_ISFIFO(obj->yst_mode))
+			return DT_FIFO;
+		if (S_ISCHR(obj->yst_mode))
+			return DT_CHR;
+		if (S_ISBLK(obj->yst_mode))
+			return DT_BLK;
+		if (S_ISSOCK(obj->yst_mode))
+			return DT_SOCK;
+	default:
+		return DT_REG;
+		break;
+	}
+}
+
+YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
+{
+	obj = yaffs_GetEquivalentObject(obj);
+	if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
+		return yaffs_CloneString(obj->variant.symLinkVariant.alias);
+	} else {
+		return yaffs_CloneString(_Y(""));
+	}
+}
+
+#ifndef CONFIG_YAFFS_WINCE
+
+int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr)
+{
+	unsigned int valid = attr->ia_valid;
+
+	if (valid & ATTR_MODE)
+		obj->yst_mode = attr->ia_mode;
+	if (valid & ATTR_UID)
+		obj->yst_uid = attr->ia_uid;
+	if (valid & ATTR_GID)
+		obj->yst_gid = attr->ia_gid;
+
+	if (valid & ATTR_ATIME)
+		obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
+	if (valid & ATTR_CTIME)
+		obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
+	if (valid & ATTR_MTIME)
+		obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
+
+	if (valid & ATTR_SIZE)
+		yaffs_ResizeFile(obj, attr->ia_size);
+
+	yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
+
+	return YAFFS_OK;
+
+}
+int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
+{
+	unsigned int valid = 0;
+
+	attr->ia_mode = obj->yst_mode;
+	valid |= ATTR_MODE;
+	attr->ia_uid = obj->yst_uid;
+	valid |= ATTR_UID;
+	attr->ia_gid = obj->yst_gid;
+	valid |= ATTR_GID;
+
+	Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
+	valid |= ATTR_ATIME;
+	Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
+	valid |= ATTR_CTIME;
+	Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
+	valid |= ATTR_MTIME;
+
+	attr->ia_size = yaffs_GetFileSize(obj);
+	valid |= ATTR_SIZE;
+
+	attr->ia_valid = valid;
+
+	return YAFFS_OK;
+
+}
+
+#endif
+
+#if 0
+int yaffs_DumpObject(yaffs_Object * obj)
+{
+	YCHAR name[257];
+
+	yaffs_GetObjectName(obj, name, 256);
+
+	T(YAFFS_TRACE_ALWAYS,
+	  (TSTR
+	   ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
+	    " chunk %d type %d size %d\n"
+	    TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
+	   obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
+	   yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
+
+	return YAFFS_OK;
+}
+#endif
+
+/*---------------------------- Initialisation code -------------------------------------- */
+
+static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
+{
+
+	/* Common functions, gotta have */
+	if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
+		return 0;
+
+#ifdef CONFIG_YAFFS_YAFFS2
+
+	/* Can use the "with tags" style interface for yaffs1 or yaffs2 */
+	if (dev->writeChunkWithTagsToNAND &&
+	    dev->readChunkWithTagsFromNAND &&
+	    !dev->writeChunkToNAND &&
+	    !dev->readChunkFromNAND &&
+	    dev->markNANDBlockBad && dev->queryNANDBlock)
+		return 1;
+#endif
+
+	/* Can use the "spare" style interface for yaffs1 */
+	if (!dev->isYaffs2 &&
+	    !dev->writeChunkWithTagsToNAND &&
+	    !dev->readChunkWithTagsFromNAND &&
+	    dev->writeChunkToNAND &&
+	    dev->readChunkFromNAND &&
+	    !dev->markNANDBlockBad && !dev->queryNANDBlock)
+		return 1;
+
+	return 0;		/* bad */
+}
+
+
+static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
+{
+	/* Initialise the unlinked, deleted, root and lost and found directories */
+	
+	dev->lostNFoundDir = dev->rootDir =  NULL;
+	dev->unlinkedDir = dev->deletedDir = NULL;
+
+	dev->unlinkedDir =
+	    yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
+	
+	dev->deletedDir =
+	    yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
+
+	dev->rootDir =
+	    yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
+				      YAFFS_ROOT_MODE | S_IFDIR);
+	dev->lostNFoundDir =
+	    yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
+				      YAFFS_LOSTNFOUND_MODE | S_IFDIR);
+	
+	if(dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir){
+		yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
+		return YAFFS_OK;
+	}
+	
+	return YAFFS_FAIL;
+}
+
+int yaffs_GutsInitialise(yaffs_Device * dev)
+{
+	int init_failed = 0;
+	unsigned x;
+	int bits;
+
+	T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
+
+	/* Check stuff that must be set */
+
+	if (!dev) {
+		T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	dev->internalStartBlock = dev->startBlock;
+	dev->internalEndBlock = dev->endBlock;
+	dev->blockOffset = 0;
+	dev->chunkOffset = 0;
+	dev->nFreeChunks = 0;
+
+	if (dev->startBlock == 0) {
+		dev->internalStartBlock = dev->startBlock + 1;
+		dev->internalEndBlock = dev->endBlock + 1;
+		dev->blockOffset = 1;
+		dev->chunkOffset = dev->nChunksPerBlock;
+	}
+
+	/* Check geometry parameters. */
+
+	if ((dev->isYaffs2 && dev->nDataBytesPerChunk < 1024) || 
+	    (!dev->isYaffs2 && dev->nDataBytesPerChunk != 512) || 
+	     dev->nChunksPerBlock < 2 || 
+	     dev->nReservedBlocks < 2 || 
+	     dev->internalStartBlock <= 0 || 
+	     dev->internalEndBlock <= 0 || 
+	     dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2)	// otherwise it is too small
+	    ) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s "
+		    TENDSTR), dev->nDataBytesPerChunk, dev->isYaffs2 ? "2" : ""));
+		return YAFFS_FAIL;
+	}
+
+	if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	/* Got the right mix of functions? */
+	if (!yaffs_CheckDevFunctions(dev)) {
+		/* Function missing */
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
+
+		return YAFFS_FAIL;
+	}
+
+	/* This is really a compilation check. */
+	if (!yaffs_CheckStructures()) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	if (dev->isMounted) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR("yaffs: device already mounted\n" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	/* Finished with most checks. One or two more checks happen later on too. */
+
+	dev->isMounted = 1;
+
+
+
+	/* OK now calculate a few things for the device */
+	
+	/*
+	 *  Calculate all the chunk size manipulation numbers: 
+	 */
+	 /* Start off assuming it is a power of 2 */
+	 dev->chunkShift = ShiftDiv(dev->nDataBytesPerChunk);
+	 dev->chunkMask = (1<<dev->chunkShift) - 1;
+
+	 if(dev->nDataBytesPerChunk == (dev->chunkMask + 1)){
+	 	/* Yes it is a power of 2, disable crumbs */
+		dev->crumbMask = 0;
+		dev->crumbShift = 0;
+		dev->crumbsPerChunk = 0;
+	 } else {
+	 	/* Not a power of 2, use crumbs instead */
+		dev->crumbShift = ShiftDiv(sizeof(yaffs_PackedTags2TagsPart));
+		dev->crumbMask = (1<<dev->crumbShift)-1;
+		dev->crumbsPerChunk = dev->nDataBytesPerChunk/(1 << dev->crumbShift);
+		dev->chunkShift = 0;
+		dev->chunkMask = 0;
+	}
+	 	
+
+	/*
+	 * Calculate chunkGroupBits.
+	 * We need to find the next power of 2 > than internalEndBlock
+	 */
+
+	x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
+	
+	bits = ShiftsGE(x);
+	
+	/* Set up tnode width if wide tnodes are enabled. */
+	if(!dev->wideTnodesDisabled){
+		/* bits must be even so that we end up with 32-bit words */
+		if(bits & 1)
+			bits++;
+		if(bits < 16)
+			dev->tnodeWidth = 16;
+		else
+			dev->tnodeWidth = bits;
+	}
+	else
+		dev->tnodeWidth = 16;
+ 
+	dev->tnodeMask = (1<<dev->tnodeWidth)-1;
+		
+	/* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
+	 * so if the bitwidth of the
+	 * chunk range we're using is greater than 16 we need
+	 * to figure out chunk shift and chunkGroupSize
+	 */
+		 
+	if (bits <= dev->tnodeWidth)
+		dev->chunkGroupBits = 0;
+	else
+		dev->chunkGroupBits = bits - dev->tnodeWidth;
+		
+
+	dev->chunkGroupSize = 1 << dev->chunkGroupBits;
+
+	if (dev->nChunksPerBlock < dev->chunkGroupSize) {
+		/* We have a problem because the soft delete won't work if
+		 * the chunk group size > chunks per block.
+		 * This can be remedied by using larger "virtual blocks".
+		 */
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR("yaffs: chunk group too large\n" TENDSTR)));
+
+		return YAFFS_FAIL;
+	}
+
+	/* OK, we've finished verifying the device, lets continue with initialisation */
+
+	/* More device initialisation */
+	dev->garbageCollections = 0;
+	dev->passiveGarbageCollections = 0;
+	dev->currentDirtyChecker = 0;
+	dev->bufferedBlock = -1;
+	dev->doingBufferedBlockRewrite = 0;
+	dev->nDeletedFiles = 0;
+	dev->nBackgroundDeletions = 0;
+	dev->nUnlinkedFiles = 0;
+	dev->eccFixed = 0;
+	dev->eccUnfixed = 0;
+	dev->tagsEccFixed = 0;
+	dev->tagsEccUnfixed = 0;
+	dev->nErasureFailures = 0;
+	dev->nErasedBlocks = 0;
+	dev->isDoingGC = 0;
+	dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
+
+	/* Initialise temporary buffers and caches. */
+	if(!yaffs_InitialiseTempBuffers(dev))
+		init_failed = 1;
+	
+	dev->srCache = NULL;
+	dev->gcCleanupList = NULL;
+	
+	
+	if (!init_failed &&
+	    dev->nShortOpCaches > 0) {
+		int i;
+		__u8 *buf;
+		int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
+
+		if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
+			dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
+		}
+
+		buf = dev->srCache =  YMALLOC(srCacheBytes);
+		    
+		if(dev->srCache)
+			memset(dev->srCache,0,srCacheBytes);
+		   
+		for (i = 0; i < dev->nShortOpCaches && buf; i++) {
+			dev->srCache[i].object = NULL;
+			dev->srCache[i].lastUse = 0;
+			dev->srCache[i].dirty = 0;
+			dev->srCache[i].data = buf = YMALLOC_DMA(dev->nDataBytesPerChunk);
+		}
+		if(!buf)
+			init_failed = 1;
+			
+		dev->srLastUse = 0;
+	}
+
+	dev->cacheHits = 0;
+	
+	if(!init_failed){
+		dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
+		if(!dev->gcCleanupList)
+			init_failed = 1;
+	}
+
+	if (dev->isYaffs2) {
+		dev->useHeaderFileSize = 1;
+	}
+	if(!init_failed && !yaffs_InitialiseBlocks(dev))
+		init_failed = 1;
+		
+	yaffs_InitialiseTnodes(dev);
+	yaffs_InitialiseObjects(dev);
+
+	if(!init_failed && !yaffs_CreateInitialDirectories(dev))
+		init_failed = 1;
+
+
+	if(!init_failed){
+		/* Now scan the flash. */
+		if (dev->isYaffs2) {
+			if(yaffs_CheckpointRestore(dev)) {
+				T(YAFFS_TRACE_ALWAYS,
+				  (TSTR("yaffs: restored from checkpoint" TENDSTR)));
+			} else {
+
+				/* Clean up the mess caused by an aborted checkpoint load 
+				 * and scan backwards. 
+				 */
+				yaffs_DeinitialiseBlocks(dev);
+				yaffs_DeinitialiseTnodes(dev);
+				yaffs_DeinitialiseObjects(dev);
+				
+			
+				dev->nErasedBlocks = 0;
+				dev->nFreeChunks = 0;
+				dev->allocationBlock = -1;
+				dev->allocationPage = -1;
+				dev->nDeletedFiles = 0;
+				dev->nUnlinkedFiles = 0;
+				dev->nBackgroundDeletions = 0;
+				dev->oldestDirtySequence = 0;
+
+				if(!init_failed && !yaffs_InitialiseBlocks(dev))
+					init_failed = 1;
+					
+				yaffs_InitialiseTnodes(dev);
+				yaffs_InitialiseObjects(dev);
+
+				if(!init_failed && !yaffs_CreateInitialDirectories(dev))
+					init_failed = 1;
+
+				if(!init_failed && !yaffs_ScanBackwards(dev))
+					init_failed = 1;
+			}
+		}else
+			if(!yaffs_Scan(dev))
+				init_failed = 1;
+	}
+		
+	if(init_failed){
+		/* Clean up the mess */
+		T(YAFFS_TRACE_TRACING,
+		  (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
+
+		yaffs_Deinitialise(dev);
+		return YAFFS_FAIL;
+	}
+
+	/* Zero out stats */
+	dev->nPageReads = 0;
+	dev->nPageWrites = 0;
+	dev->nBlockErasures = 0;
+	dev->nGCCopies = 0;
+	dev->nRetriedWrites = 0;
+
+	dev->nRetiredBlocks = 0;
+
+	yaffs_VerifyFreeChunks(dev);
+	yaffs_VerifyBlocks(dev);
+	
+
+	T(YAFFS_TRACE_TRACING,
+	  (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
+	return YAFFS_OK;
+
+}
+
+void yaffs_Deinitialise(yaffs_Device * dev)
+{
+	if (dev->isMounted) {
+		int i;
+
+		yaffs_DeinitialiseBlocks(dev);
+		yaffs_DeinitialiseTnodes(dev);
+		yaffs_DeinitialiseObjects(dev);
+		if (dev->nShortOpCaches > 0 &&
+		    dev->srCache) {
+
+			for (i = 0; i < dev->nShortOpCaches; i++) {
+				if(dev->srCache[i].data)
+					YFREE(dev->srCache[i].data);
+				dev->srCache[i].data = NULL;
+			}
+
+			YFREE(dev->srCache);
+			dev->srCache = NULL;
+		}
+
+		YFREE(dev->gcCleanupList);
+
+		for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+			YFREE(dev->tempBuffer[i].buffer);
+		}
+
+		dev->isMounted = 0;
+	}
+
+}
+
+static int yaffs_CountFreeChunks(yaffs_Device * dev)
+{
+	int nFree;
+	int b;
+
+	yaffs_BlockInfo *blk;
+
+	for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
+	     b++) {
+		blk = yaffs_GetBlockInfo(dev, b);
+
+		switch (blk->blockState) {
+		case YAFFS_BLOCK_STATE_EMPTY:
+		case YAFFS_BLOCK_STATE_ALLOCATING:
+		case YAFFS_BLOCK_STATE_COLLECTING:
+		case YAFFS_BLOCK_STATE_FULL:
+			nFree +=
+			    (dev->nChunksPerBlock - blk->pagesInUse +
+			     blk->softDeletions);
+			break;
+		default:
+			break;
+		}
+
+	}
+
+	return nFree;
+}
+
+int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
+{
+	/* This is what we report to the outside world */
+
+	int nFree;
+	int nDirtyCacheChunks;
+	int blocksForCheckpoint;
+
+#if 1
+	nFree = dev->nFreeChunks;
+#else
+	nFree = yaffs_CountFreeChunks(dev);
+#endif
+
+	nFree += dev->nDeletedFiles;
+	
+	/* Now count the number of dirty chunks in the cache and subtract those */
+
+	{
+		int i;
+		for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
+			if (dev->srCache[i].dirty)
+				nDirtyCacheChunks++;
+		}
+	}
+
+	nFree -= nDirtyCacheChunks;
+
+	nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
+	
+	/* Now we figure out how much to reserve for the checkpoint and report that... */
+	blocksForCheckpoint = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
+	if(blocksForCheckpoint < 0)
+		blocksForCheckpoint = 0;
+		
+	nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
+
+	if (nFree < 0)
+		nFree = 0;
+
+	return nFree;
+
+}
+
+static int yaffs_freeVerificationFailures;
+
+static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
+{
+	int counted;
+	int difference;
+	
+	if(yaffs_SkipVerification(dev))
+		return;
+	
+	counted = yaffs_CountFreeChunks(dev);
+
+	difference = dev->nFreeChunks - counted;
+
+	if (difference) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
+		   dev->nFreeChunks, counted, difference));
+		yaffs_freeVerificationFailures++;
+	}
+}
+
+/*---------------------------------------- YAFFS test code ----------------------*/
+
+#define yaffs_CheckStruct(structure,syze, name) \
+           if(sizeof(structure) != syze) \
+	       { \
+	         T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
+		 name,syze,sizeof(structure))); \
+	         return YAFFS_FAIL; \
+		}
+
+static int yaffs_CheckStructures(void)
+{
+/*      yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */
+/*      yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */
+/*      yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */
+#ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
+	yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode")
+#endif
+	    yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader")
+
+	    return YAFFS_OK;
+}

fs/yaffs2/yaffs_guts.h

@@ -0,0 +1,908 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_GUTS_H__
+#define __YAFFS_GUTS_H__
+
+#include "devextras.h"
+#include "yportenv.h"
+
+#define YAFFS_OK	1
+#define YAFFS_FAIL  0
+
+/* Give us a  Y=0x59, 
+ * Give us an A=0x41, 
+ * Give us an FF=0xFF 
+ * Give us an S=0x53
+ * And what have we got... 
+ */
+#define YAFFS_MAGIC			0x5941FF53
+
+#define YAFFS_NTNODES_LEVEL0	  	16
+#define YAFFS_TNODES_LEVEL0_BITS	4
+#define YAFFS_TNODES_LEVEL0_MASK	0xf
+
+#define YAFFS_NTNODES_INTERNAL 		(YAFFS_NTNODES_LEVEL0 / 2)
+#define YAFFS_TNODES_INTERNAL_BITS 	(YAFFS_TNODES_LEVEL0_BITS - 1)
+#define YAFFS_TNODES_INTERNAL_MASK	0x7
+#define YAFFS_TNODES_MAX_LEVEL		6
+
+#ifndef CONFIG_YAFFS_NO_YAFFS1
+#define YAFFS_BYTES_PER_SPARE		16
+#define YAFFS_BYTES_PER_CHUNK		512
+#define YAFFS_CHUNK_SIZE_SHIFT		9
+#define YAFFS_CHUNKS_PER_BLOCK		32
+#define YAFFS_BYTES_PER_BLOCK		(YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK)
+#endif
+
+#define YAFFS_MIN_YAFFS2_CHUNK_SIZE 	1024
+#define YAFFS_MIN_YAFFS2_SPARE_SIZE	32
+
+#define YAFFS_MAX_CHUNK_ID		0x000FFFFF
+
+#define YAFFS_UNUSED_OBJECT_ID		0x0003FFFF
+
+#define YAFFS_ALLOCATION_NOBJECTS	100
+#define YAFFS_ALLOCATION_NTNODES	100
+#define YAFFS_ALLOCATION_NLINKS		100
+
+#define YAFFS_NOBJECT_BUCKETS		256
+
+
+#define YAFFS_OBJECT_SPACE		0x40000
+
+#define YAFFS_CHECKPOINT_VERSION 	3
+
+#ifdef CONFIG_YAFFS_UNICODE
+#define YAFFS_MAX_NAME_LENGTH		127
+#define YAFFS_MAX_ALIAS_LENGTH		79
+#else
+#define YAFFS_MAX_NAME_LENGTH		255
+#define YAFFS_MAX_ALIAS_LENGTH		159
+#endif
+
+#define YAFFS_SHORT_NAME_LENGTH		15
+
+/* Some special object ids for pseudo objects */
+#define YAFFS_OBJECTID_ROOT		1
+#define YAFFS_OBJECTID_LOSTNFOUND	2
+#define YAFFS_OBJECTID_UNLINKED		3
+#define YAFFS_OBJECTID_DELETED		4
+
+/* Sseudo object ids for checkpointing */
+#define YAFFS_OBJECTID_SB_HEADER	0x10
+#define YAFFS_OBJECTID_CHECKPOINT_DATA	0x20
+#define YAFFS_SEQUENCE_CHECKPOINT_DATA  0x21
+
+/* */
+
+#define YAFFS_MAX_SHORT_OP_CACHES	20
+
+#define YAFFS_N_TEMP_BUFFERS		4
+
+/* We limit the number attempts at sucessfully saving a chunk of data.
+ * Small-page devices have 32 pages per block; large-page devices have 64.
+ * Default to something in the order of 5 to 10 blocks worth of chunks.
+ */
+#define YAFFS_WR_ATTEMPTS		(5*64)
+
+/* Sequence numbers are used in YAFFS2 to determine block allocation order.
+ * The range is limited slightly to help distinguish bad numbers from good.
+ * This also allows us to perhaps in the future use special numbers for
+ * special purposes.
+ * EFFFFF00 allows the allocation of 8 blocks per second (~1Mbytes) for 15 years, 
+ * and is a larger number than the lifetime of a 2GB device.
+ */
+#define YAFFS_LOWEST_SEQUENCE_NUMBER	0x00001000
+#define YAFFS_HIGHEST_SEQUENCE_NUMBER	0xEFFFFF00
+
+/* ChunkCache is used for short read/write operations.*/
+typedef struct {
+	struct yaffs_ObjectStruct *object;
+	int chunkId;
+	int lastUse;
+	int dirty;
+	int nBytes;		/* Only valid if the cache is dirty */
+	int locked;		/* Can't push out or flush while locked. */
+#ifdef CONFIG_YAFFS_YAFFS2
+	__u8 *data;
+#else
+	__u8 data[YAFFS_BYTES_PER_CHUNK];
+#endif
+} yaffs_ChunkCache;
+
+
+
+/* Tags structures in RAM
+ * NB This uses bitfield. Bitfields should not straddle a u32 boundary otherwise
+ * the structure size will get blown out.
+ */
+
+#ifndef CONFIG_YAFFS_NO_YAFFS1
+typedef struct {
+	unsigned chunkId:20;
+	unsigned serialNumber:2;
+	unsigned byteCount:10;
+	unsigned objectId:18;
+	unsigned ecc:12;
+	unsigned unusedStuff:2;
+
+} yaffs_Tags;
+
+typedef union {
+	yaffs_Tags asTags;
+	__u8 asBytes[8];
+} yaffs_TagsUnion;
+
+#endif
+
+/* Stuff used for extended tags in YAFFS2 */
+
+typedef enum {
+	YAFFS_ECC_RESULT_UNKNOWN,
+	YAFFS_ECC_RESULT_NO_ERROR,
+	YAFFS_ECC_RESULT_FIXED,
+	YAFFS_ECC_RESULT_UNFIXED
+} yaffs_ECCResult;
+
+typedef enum {
+	YAFFS_OBJECT_TYPE_UNKNOWN,
+	YAFFS_OBJECT_TYPE_FILE,
+	YAFFS_OBJECT_TYPE_SYMLINK,
+	YAFFS_OBJECT_TYPE_DIRECTORY,
+	YAFFS_OBJECT_TYPE_HARDLINK,
+	YAFFS_OBJECT_TYPE_SPECIAL
+} yaffs_ObjectType;
+
+#define YAFFS_OBJECT_TYPE_MAX YAFFS_OBJECT_TYPE_SPECIAL
+
+typedef struct {
+
+	unsigned validMarker0;
+	unsigned chunkUsed;	/*  Status of the chunk: used or unused */
+	unsigned objectId;	/* If 0 then this is not part of an object (unused) */
+	unsigned chunkId;	/* If 0 then this is a header, else a data chunk */
+	unsigned byteCount;	/* Only valid for data chunks */
+
+	/* The following stuff only has meaning when we read */
+	yaffs_ECCResult eccResult;
+	unsigned blockBad;	
+
+	/* YAFFS 1 stuff */
+	unsigned chunkDeleted;	/* The chunk is marked deleted */
+	unsigned serialNumber;	/* Yaffs1 2-bit serial number */
+
+	/* YAFFS2 stuff */
+	unsigned sequenceNumber;	/* The sequence number of this block */
+
+	/* Extra info if this is an object header (YAFFS2 only) */
+
+	unsigned extraHeaderInfoAvailable;	/* There is extra info available if this is not zero */
+	unsigned extraParentObjectId;	/* The parent object */
+	unsigned extraIsShrinkHeader;	/* Is it a shrink header? */
+	unsigned extraShadows;		/* Does this shadow another object? */
+
+	yaffs_ObjectType extraObjectType;	/* What object type? */
+
+	unsigned extraFileLength;		/* Length if it is a file */
+	unsigned extraEquivalentObjectId;	/* Equivalent object Id if it is a hard link */
+
+	unsigned validMarker1;
+
+} yaffs_ExtendedTags;
+
+/* Spare structure for YAFFS1 */
+typedef struct {
+	__u8 tagByte0;
+	__u8 tagByte1;
+	__u8 tagByte2;
+	__u8 tagByte3;
+	__u8 pageStatus;	/* set to 0 to delete the chunk */
+	__u8 blockStatus;
+	__u8 tagByte4;
+	__u8 tagByte5;
+	__u8 ecc1[3];
+	__u8 tagByte6;
+	__u8 tagByte7;
+	__u8 ecc2[3];
+} yaffs_Spare;
+
+/*Special structure for passing through to mtd */
+struct yaffs_NANDSpare {
+	yaffs_Spare spare;
+	int eccres1;
+	int eccres2;
+};
+
+/* Block data in RAM */
+
+typedef enum {
+	YAFFS_BLOCK_STATE_UNKNOWN = 0,
+
+	YAFFS_BLOCK_STATE_SCANNING,
+	YAFFS_BLOCK_STATE_NEEDS_SCANNING,
+	/* The block might have something on it (ie it is allocating or full, perhaps empty)
+	 * but it needs to be scanned to determine its true state.
+	 * This state is only valid during yaffs_Scan.
+	 * NB We tolerate empty because the pre-scanner might be incapable of deciding
+	 * However, if this state is returned on a YAFFS2 device, then we expect a sequence number
+	 */
+
+	YAFFS_BLOCK_STATE_EMPTY,
+	/* This block is empty */
+
+	YAFFS_BLOCK_STATE_ALLOCATING,
+	/* This block is partially allocated. 
+	 * At least one page holds valid data.
+	 * This is the one currently being used for page
+	 * allocation. Should never be more than one of these
+	 */
+
+	YAFFS_BLOCK_STATE_FULL,	
+	/* All the pages in this block have been allocated.
+	 */
+
+	YAFFS_BLOCK_STATE_DIRTY,
+	/* All pages have been allocated and deleted. 
+	 * Erase me, reuse me.
+	 */
+
+	YAFFS_BLOCK_STATE_CHECKPOINT,	
+	/* This block is assigned to holding checkpoint data.
+	 */
+
+	YAFFS_BLOCK_STATE_COLLECTING,	
+	/* This block is being garbage collected */
+
+	YAFFS_BLOCK_STATE_DEAD	
+	/* This block has failed and is not in use */
+} yaffs_BlockState;
+
+#define	YAFFS_NUMBER_OF_BLOCK_STATES (YAFFS_BLOCK_STATE_DEAD + 1)
+
+
+typedef struct {
+
+	int softDeletions:10;	/* number of soft deleted pages */
+	int pagesInUse:10;	/* number of pages in use */
+	unsigned blockState:4;	/* One of the above block states. NB use unsigned because enum is sometimes an int */
+	__u32 needsRetiring:1;	/* Data has failed on this block, need to get valid data off */
+                        	/* and retire the block. */
+	__u32 skipErasedCheck: 1; /* If this is set we can skip the erased check on this block */
+	__u32 gcPrioritise: 1; 	/* An ECC check or blank check has failed on this block. 
+				   It should be prioritised for GC */
+        __u32 chunkErrorStrikes:3; /* How many times we've had ecc etc failures on this block and tried to reuse it */
+
+#ifdef CONFIG_YAFFS_YAFFS2
+	__u32 hasShrinkHeader:1; /* This block has at least one shrink object header */
+	__u32 sequenceNumber;	 /* block sequence number for yaffs2 */
+#endif
+
+} yaffs_BlockInfo;
+
+/* -------------------------- Object structure -------------------------------*/
+/* This is the object structure as stored on NAND */
+
+typedef struct {
+	yaffs_ObjectType type;
+
+	/* Apply to everything  */
+	int parentObjectId;
+	__u16 sum__NoLongerUsed;	/* checksum of name. No longer used */
+	YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
+
+	/* Thes following apply to directories, files, symlinks - not hard links */
+	__u32 yst_mode;		/* protection */
+
+#ifdef CONFIG_YAFFS_WINCE
+	__u32 notForWinCE[5];
+#else
+	__u32 yst_uid;
+	__u32 yst_gid;
+	__u32 yst_atime;
+	__u32 yst_mtime;
+	__u32 yst_ctime;
+#endif
+
+	/* File size  applies to files only */
+	int fileSize;
+
+	/* Equivalent object id applies to hard links only. */
+	int equivalentObjectId;
+
+	/* Alias is for symlinks only. */
+	YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1];
+
+	__u32 yst_rdev;		/* device stuff for block and char devices (major/min) */
+
+#ifdef CONFIG_YAFFS_WINCE
+	__u32 win_ctime[2];
+	__u32 win_atime[2];
+	__u32 win_mtime[2];
+	__u32 roomToGrow[4];
+#else
+	__u32 roomToGrow[10];
+#endif
+
+	int shadowsObject;	/* This object header shadows the specified object if > 0 */
+
+	/* isShrink applies to object headers written when we shrink the file (ie resize) */
+	__u32 isShrink;
+
+} yaffs_ObjectHeader;
+
+/*--------------------------- Tnode -------------------------- */
+
+union yaffs_Tnode_union {
+#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
+	union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL + 1];
+#else
+	union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL];
+#endif
+/*	__u16 level0[YAFFS_NTNODES_LEVEL0]; */
+
+};
+
+typedef union yaffs_Tnode_union yaffs_Tnode;
+
+struct yaffs_TnodeList_struct {
+	struct yaffs_TnodeList_struct *next;
+	yaffs_Tnode *tnodes;
+};
+
+typedef struct yaffs_TnodeList_struct yaffs_TnodeList;
+
+/*------------------------  Object -----------------------------*/
+/* An object can be one of:
+ * - a directory (no data, has children links
+ * - a regular file (data.... not prunes :->).
+ * - a symlink [symbolic link] (the alias).
+ * - a hard link
+ */
+
+typedef struct {
+	__u32 fileSize;
+	__u32 scannedFileSize;
+	__u32 shrinkSize;
+	int topLevel;
+	yaffs_Tnode *top;
+} yaffs_FileStructure;
+
+typedef struct {
+	struct list_head children;	/* list of child links */
+} yaffs_DirectoryStructure;
+
+typedef struct {
+	YCHAR *alias;
+} yaffs_SymLinkStructure;
+
+typedef struct {
+	struct yaffs_ObjectStruct *equivalentObject;
+	__u32 equivalentObjectId;
+} yaffs_HardLinkStructure;
+
+typedef union {
+	yaffs_FileStructure fileVariant;
+	yaffs_DirectoryStructure directoryVariant;
+	yaffs_SymLinkStructure symLinkVariant;
+	yaffs_HardLinkStructure hardLinkVariant;
+} yaffs_ObjectVariant;
+
+struct yaffs_ObjectStruct {
+	__u8 deleted:1;		/* This should only apply to unlinked files. */
+	__u8 softDeleted:1;	/* it has also been soft deleted */
+	__u8 unlinked:1;	/* An unlinked file. The file should be in the unlinked directory.*/
+	__u8 fake:1;		/* A fake object has no presence on NAND. */
+	__u8 renameAllowed:1;	/* Some objects are not allowed to be renamed. */
+	__u8 unlinkAllowed:1;
+	__u8 dirty:1;		/* the object needs to be written to flash */
+	__u8 valid:1;		/* When the file system is being loaded up, this 
+				 * object might be created before the data
+				 * is available (ie. file data records appear before the header).
+				 */
+	__u8 lazyLoaded:1;	/* This object has been lazy loaded and is missing some detail */
+
+	__u8 deferedFree:1;	/* For Linux kernel. Object is removed from NAND, but is
+				 * still in the inode cache. Free of object is defered.
+				 * until the inode is released.
+				 */
+
+	__u8 serial;		/* serial number of chunk in NAND. Cached here */
+	__u16 sum;		/* sum of the name to speed searching */
+
+	struct yaffs_DeviceStruct *myDev;	/* The device I'm on */
+
+	struct list_head hashLink;	/* list of objects in this hash bucket */
+
+	struct list_head hardLinks;	/* all the equivalent hard linked objects */
+
+	/* directory structure stuff */
+	/* also used for linking up the free list */
+	struct yaffs_ObjectStruct *parent; 
+	struct list_head siblings;
+
+	/* Where's my object header in NAND? */
+	int chunkId;		
+
+	int nDataChunks;	/* Number of data chunks attached to the file. */
+
+	__u32 objectId;		/* the object id value */
+
+	__u32 yst_mode;
+
+#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
+	YCHAR shortName[YAFFS_SHORT_NAME_LENGTH + 1];
+#endif
+
+/* XXX U-BOOT XXX */
+/* #ifndef __KERNEL__ */
+	__u32 inUse;
+/* #endif */
+
+#ifdef CONFIG_YAFFS_WINCE
+	__u32 win_ctime[2];
+	__u32 win_mtime[2];
+	__u32 win_atime[2];
+#else
+	__u32 yst_uid;
+	__u32 yst_gid;
+	__u32 yst_atime;
+	__u32 yst_mtime;
+	__u32 yst_ctime;
+#endif
+
+	__u32 yst_rdev;
+
+/* XXX U-BOOT XXX */
+/* #ifndef __KERNEL__ */
+	struct inode *myInode;
+/* #endif */
+
+	yaffs_ObjectType variantType;
+
+	yaffs_ObjectVariant variant;
+
+};
+
+typedef struct yaffs_ObjectStruct yaffs_Object;
+
+struct yaffs_ObjectList_struct {
+	yaffs_Object *objects;
+	struct yaffs_ObjectList_struct *next;
+};
+
+typedef struct yaffs_ObjectList_struct yaffs_ObjectList;
+
+typedef struct {
+	struct list_head list;
+	int count;
+} yaffs_ObjectBucket;
+
+
+/* yaffs_CheckpointObject holds the definition of an object as dumped 
+ * by checkpointing.
+ */
+
+typedef struct {
+        int structType;
+	__u32 objectId;		
+	__u32 parentId;
+	int chunkId;
+			
+	yaffs_ObjectType variantType:3;
+	__u8 deleted:1;		
+	__u8 softDeleted:1;	
+	__u8 unlinked:1;	
+	__u8 fake:1;		
+	__u8 renameAllowed:1;
+	__u8 unlinkAllowed:1;
+	__u8 serial;		
+	
+	int nDataChunks;	
+	__u32 fileSizeOrEquivalentObjectId;
+
+}yaffs_CheckpointObject;
+
+/*--------------------- Temporary buffers ----------------
+ *
+ * These are chunk-sized working buffers. Each device has a few
+ */
+
+typedef struct {
+	__u8 *buffer;
+	int line;	/* track from whence this buffer was allocated */
+	int maxLine;
+} yaffs_TempBuffer;
+
+/*----------------- Device ---------------------------------*/
+
+struct yaffs_DeviceStruct {
+	struct list_head devList;
+	const char *name;
+
+	/* Entry parameters set up way early. Yaffs sets up the rest.*/
+	int nDataBytesPerChunk;	/* Should be a power of 2 >= 512 */
+	int nChunksPerBlock;	/* does not need to be a power of 2 */
+	int nBytesPerSpare;	/* spare area size */
+	int startBlock;		/* Start block we're allowed to use */
+	int endBlock;		/* End block we're allowed to use */
+	int nReservedBlocks;	/* We want this tuneable so that we can reduce */
+				/* reserved blocks on NOR and RAM. */
+	
+	
+	/* Stuff used by the shared space checkpointing mechanism */
+	/* If this value is zero, then this mechanism is disabled */
+	
+	int nCheckpointReservedBlocks; /* Blocks to reserve for checkpoint data */
+
+	
+
+
+	int nShortOpCaches;	/* If <= 0, then short op caching is disabled, else
+				 * the number of short op caches (don't use too many)
+				 */
+
+	int useHeaderFileSize;	/* Flag to determine if we should use file sizes from the header */
+
+	int useNANDECC;		/* Flag to decide whether or not to use NANDECC */
+
+	void *genericDevice;	/* Pointer to device context
+				 * On an mtd this holds the mtd pointer.
+				 */
+        void *superBlock;
+        
+	/* NAND access functions (Must be set before calling YAFFS)*/
+
+	int (*writeChunkToNAND) (struct yaffs_DeviceStruct * dev,
+				 int chunkInNAND, const __u8 * data,
+				 const yaffs_Spare * spare);
+	int (*readChunkFromNAND) (struct yaffs_DeviceStruct * dev,
+				  int chunkInNAND, __u8 * data,
+				  yaffs_Spare * spare);
+	int (*eraseBlockInNAND) (struct yaffs_DeviceStruct * dev,
+				 int blockInNAND);
+	int (*initialiseNAND) (struct yaffs_DeviceStruct * dev);
+
+#ifdef CONFIG_YAFFS_YAFFS2
+	int (*writeChunkWithTagsToNAND) (struct yaffs_DeviceStruct * dev,
+					 int chunkInNAND, const __u8 * data,
+					 const yaffs_ExtendedTags * tags);
+	int (*readChunkWithTagsFromNAND) (struct yaffs_DeviceStruct * dev,
+					  int chunkInNAND, __u8 * data,
+					  yaffs_ExtendedTags * tags);
+	int (*markNANDBlockBad) (struct yaffs_DeviceStruct * dev, int blockNo);
+	int (*queryNANDBlock) (struct yaffs_DeviceStruct * dev, int blockNo,
+			       yaffs_BlockState * state, int *sequenceNumber);
+#endif
+
+	int isYaffs2;
+	
+	/* The removeObjectCallback function must be supplied by OS flavours that 
+	 * need it. The Linux kernel does not use this, but yaffs direct does use
+	 * it to implement the faster readdir
+	 */
+	void (*removeObjectCallback)(struct yaffs_ObjectStruct *obj);
+	
+	/* Callback to mark the superblock dirsty */
+	void (*markSuperBlockDirty)(void * superblock);
+	
+	int wideTnodesDisabled; /* Set to disable wide tnodes */
+	
+
+	/* End of stuff that must be set before initialisation. */
+	
+	/* Checkpoint control. Can be set before or after initialisation */
+	__u8 skipCheckpointRead;
+	__u8 skipCheckpointWrite;
+
+	/* Runtime parameters. Set up by YAFFS. */
+
+	__u16 chunkGroupBits;	/* 0 for devices <= 32MB. else log2(nchunks) - 16 */
+	__u16 chunkGroupSize;	/* == 2^^chunkGroupBits */
+	
+	/* Stuff to support wide tnodes */
+	__u32 tnodeWidth;
+	__u32 tnodeMask;
+	
+	/* Stuff to support various file offses to chunk/offset translations */
+	/* "Crumbs" for nDataBytesPerChunk not being a power of 2 */
+	__u32 crumbMask;
+	__u32 crumbShift;
+	__u32 crumbsPerChunk;
+	
+	/* Straight shifting for nDataBytesPerChunk being a power of 2 */
+	__u32 chunkShift;
+	__u32 chunkMask;
+	
+
+/* XXX U-BOOT XXX */
+#if 0
+#ifndef __KERNEL__
+
+	struct semaphore sem;	/* Semaphore for waiting on erasure.*/
+	struct semaphore grossLock;	/* Gross locking semaphore */
+	void (*putSuperFunc) (struct super_block * sb);
+#endif
+#endif
+	__u8 *spareBuffer;	/* For mtdif2 use. Don't know the size of the buffer 
+				 * at compile time so we have to allocate it.
+				 */
+
+	int isMounted;
+	
+	int isCheckpointed;
+
+
+	/* Stuff to support block offsetting to support start block zero */
+	int internalStartBlock;
+	int internalEndBlock;
+	int blockOffset;
+	int chunkOffset;
+	
+
+	/* Runtime checkpointing stuff */
+	int checkpointPageSequence;   /* running sequence number of checkpoint pages */
+	int checkpointByteCount;
+	int checkpointByteOffset;
+	__u8 *checkpointBuffer;
+	int checkpointOpenForWrite;
+	int blocksInCheckpoint;
+	int checkpointCurrentChunk;
+	int checkpointCurrentBlock;
+	int checkpointNextBlock;
+	int *checkpointBlockList;
+	int checkpointMaxBlocks;
+	__u32 checkpointSum;
+	__u32 checkpointXor;
+	
+	/* Block Info */
+	yaffs_BlockInfo *blockInfo;
+	__u8 *chunkBits;	/* bitmap of chunks in use */
+	unsigned blockInfoAlt:1;	/* was allocated using alternative strategy */
+	unsigned chunkBitsAlt:1;	/* was allocated using alternative strategy */
+	int chunkBitmapStride;	/* Number of bytes of chunkBits per block. 
+				 * Must be consistent with nChunksPerBlock.
+				 */
+
+	int nErasedBlocks;
+	int allocationBlock;	/* Current block being allocated off */
+	__u32 allocationPage;
+	int allocationBlockFinder;	/* Used to search for next allocation block */
+
+	/* Runtime state */
+	int nTnodesCreated;
+	yaffs_Tnode *freeTnodes;
+	int nFreeTnodes;
+	yaffs_TnodeList *allocatedTnodeList;
+
+	int isDoingGC;
+
+	int nObjectsCreated;
+	yaffs_Object *freeObjects;
+	int nFreeObjects;
+
+	yaffs_ObjectList *allocatedObjectList;
+
+	yaffs_ObjectBucket objectBucket[YAFFS_NOBJECT_BUCKETS];
+
+	int nFreeChunks;
+
+	int currentDirtyChecker;	/* Used to find current dirtiest block */
+
+	__u32 *gcCleanupList;	/* objects to delete at the end of a GC. */
+	int nonAggressiveSkip;	/* GC state/mode */
+
+	/* Statistcs */
+	int nPageWrites;
+	int nPageReads;
+	int nBlockErasures;
+	int nErasureFailures;
+	int nGCCopies;
+	int garbageCollections;
+	int passiveGarbageCollections;
+	int nRetriedWrites;
+	int nRetiredBlocks;
+	int eccFixed;
+	int eccUnfixed;
+	int tagsEccFixed;
+	int tagsEccUnfixed;
+	int nDeletions;
+	int nUnmarkedDeletions;
+	
+	int hasPendingPrioritisedGCs; /* We think this device might have pending prioritised gcs */
+
+	/* Special directories */
+	yaffs_Object *rootDir;
+	yaffs_Object *lostNFoundDir;
+
+	/* Buffer areas for storing data to recover from write failures TODO
+	 *      __u8            bufferedData[YAFFS_CHUNKS_PER_BLOCK][YAFFS_BYTES_PER_CHUNK];
+	 *      yaffs_Spare bufferedSpare[YAFFS_CHUNKS_PER_BLOCK];
+	 */
+	
+	int bufferedBlock;	/* Which block is buffered here? */
+	int doingBufferedBlockRewrite;
+
+	yaffs_ChunkCache *srCache;
+	int srLastUse;
+
+	int cacheHits;
+
+	/* Stuff for background deletion and unlinked files.*/
+	yaffs_Object *unlinkedDir;	/* Directory where unlinked and deleted files live. */
+	yaffs_Object *deletedDir;	/* Directory where deleted objects are sent to disappear. */
+	yaffs_Object *unlinkedDeletion;	/* Current file being background deleted.*/
+	int nDeletedFiles;		/* Count of files awaiting deletion;*/
+	int nUnlinkedFiles;		/* Count of unlinked files. */
+	int nBackgroundDeletions;	/* Count of background deletions. */
+
+
+	yaffs_TempBuffer tempBuffer[YAFFS_N_TEMP_BUFFERS];
+	int maxTemp;
+	int unmanagedTempAllocations;
+	int unmanagedTempDeallocations;
+
+	/* yaffs2 runtime stuff */
+	unsigned sequenceNumber;	/* Sequence number of currently allocating block */
+	unsigned oldestDirtySequence;
+
+};
+
+typedef struct yaffs_DeviceStruct yaffs_Device;
+
+/* The static layout of bllock usage etc is stored in the super block header */
+typedef struct {
+        int StructType;
+	int version;
+	int checkpointStartBlock;
+	int checkpointEndBlock;
+	int startBlock;
+	int endBlock;
+	int rfu[100];
+} yaffs_SuperBlockHeader;
+	
+/* The CheckpointDevice structure holds the device information that changes at runtime and
+ * must be preserved over unmount/mount cycles.
+ */
+typedef struct {
+        int structType;
+	int nErasedBlocks;
+	int allocationBlock;	/* Current block being allocated off */
+	__u32 allocationPage;
+	int nFreeChunks;
+
+	int nDeletedFiles;		/* Count of files awaiting deletion;*/
+	int nUnlinkedFiles;		/* Count of unlinked files. */
+	int nBackgroundDeletions;	/* Count of background deletions. */
+
+	/* yaffs2 runtime stuff */
+	unsigned sequenceNumber;	/* Sequence number of currently allocating block */
+	unsigned oldestDirtySequence;
+
+} yaffs_CheckpointDevice;
+
+
+typedef struct {
+    int structType;
+    __u32 magic;
+    __u32 version;
+    __u32 head;
+} yaffs_CheckpointValidity;
+
+/* Function to manipulate block info */
+static Y_INLINE yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blk)
+{
+	if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
+		T(YAFFS_TRACE_ERROR,
+		  (TSTR
+		   ("**>> yaffs: getBlockInfo block %d is not valid" TENDSTR),
+		   blk));
+		YBUG();
+	}
+	return &dev->blockInfo[blk - dev->internalStartBlock];
+}
+
+/*----------------------- YAFFS Functions -----------------------*/
+
+int yaffs_GutsInitialise(yaffs_Device * dev);
+void yaffs_Deinitialise(yaffs_Device * dev);
+
+int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev);
+
+int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
+		       yaffs_Object * newDir, const YCHAR * newName);
+
+int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name);
+int yaffs_DeleteFile(yaffs_Object * obj);
+
+int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize);
+int yaffs_GetObjectFileLength(yaffs_Object * obj);
+int yaffs_GetObjectInode(yaffs_Object * obj);
+unsigned yaffs_GetObjectType(yaffs_Object * obj);
+int yaffs_GetObjectLinkCount(yaffs_Object * obj);
+
+int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr);
+int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr);
+
+/* File operations */
+int yaffs_ReadDataFromFile(yaffs_Object * obj, __u8 * buffer, loff_t offset,
+			   int nBytes);
+int yaffs_WriteDataToFile(yaffs_Object * obj, const __u8 * buffer, loff_t offset,
+			  int nBytes, int writeThrough);
+int yaffs_ResizeFile(yaffs_Object * obj, loff_t newSize);
+
+yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
+			      __u32 mode, __u32 uid, __u32 gid);
+int yaffs_FlushFile(yaffs_Object * obj, int updateTime);
+
+/* Flushing and checkpointing */
+void yaffs_FlushEntireDeviceCache(yaffs_Device *dev);
+
+int yaffs_CheckpointSave(yaffs_Device *dev);
+int yaffs_CheckpointRestore(yaffs_Device *dev);
+
+/* Directory operations */
+yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
+				   __u32 mode, __u32 uid, __u32 gid);
+yaffs_Object *yaffs_FindObjectByName(yaffs_Object * theDir, const YCHAR * name);
+int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
+				   int (*fn) (yaffs_Object *));
+
+yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number);
+
+/* Link operations */
+yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
+			 yaffs_Object * equivalentObject);
+
+yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj);
+
+/* Symlink operations */
+yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
+				 __u32 mode, __u32 uid, __u32 gid,
+				 const YCHAR * alias);
+YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj);
+
+/* Special inodes (fifos, sockets and devices) */
+yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
+				 __u32 mode, __u32 uid, __u32 gid, __u32 rdev);
+
+/* Special directories */
+yaffs_Object *yaffs_Root(yaffs_Device * dev);
+yaffs_Object *yaffs_LostNFound(yaffs_Device * dev);
+
+#ifdef CONFIG_YAFFS_WINCE
+/* CONFIG_YAFFS_WINCE special stuff */
+void yfsd_WinFileTimeNow(__u32 target[2]);
+#endif
+
+/* XXX U-BOOT XXX */
+#if 0
+#ifndef __KERNEL__
+void yaffs_HandleDeferedFree(yaffs_Object * obj);
+#endif
+#endif
+
+/* Debug dump  */
+int yaffs_DumpObject(yaffs_Object * obj);
+
+void yaffs_GutsTest(yaffs_Device * dev);
+
+/* A few useful functions */
+void yaffs_InitialiseTags(yaffs_ExtendedTags * tags);
+void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn);
+int yaffs_CheckFF(__u8 * buffer, int nBytes);
+void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi);
+
+#endif

fs/yaffs2/yaffs_malloc.h

@@ -0,0 +1,26 @@
+#ifndef __YAFFS_MALLOC_H__
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+ 
+/* XXX U-BOOT XXX */
+#if 0
+#include <stdlib.h>
+#endif 
+
+void *yaffs_malloc(size_t size); 
+void yaffs_free(void *ptr);
+ 
+#endif
+

fs/yaffs2/yaffs_mtdif.c

@@ -0,0 +1,246 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* XXX U-BOOT XXX */
+#include <common.h>
+
+const char *yaffs_mtdif_c_version =
+    "$Id: yaffs_mtdif.c,v 1.19 2007/02/14 01:09:06 wookey Exp $";
+
+#include "yportenv.h"
+
+
+#include "yaffs_mtdif.h"
+
+#include "linux/mtd/mtd.h"
+#include "linux/types.h"
+#include "linux/time.h"
+#include "linux/mtd/nand.h"
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
+static struct nand_oobinfo yaffs_oobinfo = {
+	.useecc = 1,
+	.eccbytes = 6,
+	.eccpos = {8, 9, 10, 13, 14, 15}
+};
+
+static struct nand_oobinfo yaffs_noeccinfo = {
+	.useecc = 0,
+};
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
+static inline void translate_spare2oob(const yaffs_Spare *spare, __u8 *oob)
+{
+	oob[0] = spare->tagByte0;
+	oob[1] = spare->tagByte1;
+	oob[2] = spare->tagByte2;
+	oob[3] = spare->tagByte3;
+	oob[4] = spare->tagByte4;
+	oob[5] = spare->tagByte5 & 0x3f;
+	oob[5] |= spare->blockStatus == 'Y' ? 0: 0x80;
+	oob[5] |= spare->pageStatus == 0 ? 0: 0x40;
+	oob[6] = spare->tagByte6;
+	oob[7] = spare->tagByte7;
+}
+
+static inline void translate_oob2spare(yaffs_Spare *spare, __u8 *oob)
+{
+	struct yaffs_NANDSpare *nspare = (struct yaffs_NANDSpare *)spare;
+	spare->tagByte0 = oob[0];
+	spare->tagByte1 = oob[1];
+	spare->tagByte2 = oob[2];
+	spare->tagByte3 = oob[3];
+	spare->tagByte4 = oob[4];
+	spare->tagByte5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
+	spare->blockStatus = oob[5] & 0x80 ? 0xff : 'Y';
+	spare->pageStatus = oob[5] & 0x40 ? 0xff : 0;
+	spare->ecc1[0] = spare->ecc1[1] = spare->ecc1[2] = 0xff;
+	spare->tagByte6 = oob[6];
+	spare->tagByte7 = oob[7];
+	spare->ecc2[0] = spare->ecc2[1] = spare->ecc2[2] = 0xff;
+
+	nspare->eccres1 = nspare->eccres2 = 0; /* FIXME */
+}
+#endif
+
+int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
+			     const __u8 * data, const yaffs_Spare * spare)
+{
+	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
+	struct mtd_oob_ops ops;
+#endif
+	size_t dummy;
+	int retval = 0;
+
+	loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
+	__u8 spareAsBytes[8]; /* OOB */
+
+	if (data && !spare)
+		retval = mtd->write(mtd, addr, dev->nDataBytesPerChunk,
+				&dummy, data);
+	else if (spare) {
+		if (dev->useNANDECC) {
+			translate_spare2oob(spare, spareAsBytes);
+			ops.mode = MTD_OOB_AUTO;
+			ops.ooblen = 8; /* temp hack */
+		} else {
+			ops.mode = MTD_OOB_RAW;
+			ops.ooblen = YAFFS_BYTES_PER_SPARE;
+		}
+		ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
+		ops.datbuf = (u8 *)data;
+		ops.ooboffs = 0;
+		ops.oobbuf = spareAsBytes;
+		retval = mtd->write_oob(mtd, addr, &ops);
+	}
+#else
+	__u8 *spareAsBytes = (__u8 *) spare;
+
+	if (data && spare) {
+		if (dev->useNANDECC)
+			retval =
+			    mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
+					   &dummy, data, spareAsBytes,
+					   &yaffs_oobinfo);
+		else
+			retval =
+			    mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
+					   &dummy, data, spareAsBytes,
+					   &yaffs_noeccinfo);
+	} else {
+		if (data)
+			retval =
+			    mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
+				       data);
+		if (spare)
+			retval =
+			    mtd->write_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
+					   &dummy, spareAsBytes);
+	}
+#endif
+
+	if (retval == 0)
+		return YAFFS_OK;
+	else
+		return YAFFS_FAIL;
+}
+
+int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
+			      yaffs_Spare * spare)
+{
+	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
+	struct mtd_oob_ops ops;
+#endif
+	size_t dummy;
+	int retval = 0;
+
+	loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
+	__u8 spareAsBytes[8]; /* OOB */
+
+	if (data && !spare)
+		retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
+				&dummy, data);
+	else if (spare) {
+		if (dev->useNANDECC) {
+			ops.mode = MTD_OOB_AUTO;
+			ops.ooblen = 8; /* temp hack */
+		} else {
+			ops.mode = MTD_OOB_RAW;
+			ops.ooblen = YAFFS_BYTES_PER_SPARE;
+		}
+		ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
+		ops.datbuf = data;
+		ops.ooboffs = 0;
+		ops.oobbuf = spareAsBytes;
+		retval = mtd->read_oob(mtd, addr, &ops);
+		if (dev->useNANDECC)
+			translate_oob2spare(spare, spareAsBytes);
+	}
+#else
+	__u8 *spareAsBytes = (__u8 *) spare;
+
+	if (data && spare) {
+		if (dev->useNANDECC) {	
+			/* Careful, this call adds 2 ints */
+			/* to the end of the spare data.  Calling function */
+			/* should allocate enough memory for spare, */
+			/* i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)]. */
+			retval =
+			    mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
+					  &dummy, data, spareAsBytes,
+					  &yaffs_oobinfo);
+		} else {
+			retval =
+			    mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
+					  &dummy, data, spareAsBytes,
+					  &yaffs_noeccinfo);
+		}
+	} else {
+		if (data)
+			retval =
+			    mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
+				      data);
+		if (spare)
+			retval =
+			    mtd->read_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
+					  &dummy, spareAsBytes);
+	}
+#endif
+
+	if (retval == 0)
+		return YAFFS_OK;
+	else
+		return YAFFS_FAIL;
+}
+
+int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber)
+{
+	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+	__u32 addr =
+	    ((loff_t) blockNumber) * dev->nDataBytesPerChunk
+		* dev->nChunksPerBlock;
+	struct erase_info ei;
+	int retval = 0;
+
+	ei.mtd = mtd;
+	ei.addr = addr;
+	ei.len = dev->nDataBytesPerChunk * dev->nChunksPerBlock;
+	ei.time = 1000;
+	ei.retries = 2;
+	ei.callback = NULL;
+	ei.priv = (u_long) dev;
+
+	/* Todo finish off the ei if required */
+
+/* XXX U-BOOT XXX */
+#if 0
+	sema_init(&dev->sem, 0);
+#endif
+
+	retval = mtd->erase(mtd, &ei);
+
+	if (retval == 0)
+		return YAFFS_OK;
+	else
+		return YAFFS_FAIL;
+}
+
+int nandmtd_InitialiseNAND(yaffs_Device * dev)
+{
+	return YAFFS_OK;
+}

fs/yaffs2/yaffs_mtdif.h

@@ -0,0 +1,27 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_MTDIF_H__
+#define __YAFFS_MTDIF_H__
+
+#include "yaffs_guts.h"
+
+int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
+			     const __u8 * data, const yaffs_Spare * spare);
+int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
+			      yaffs_Spare * spare);
+int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber);
+int nandmtd_InitialiseNAND(yaffs_Device * dev);
+#endif

fs/yaffs2/yaffs_mtdif2.c

@@ -0,0 +1,235 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* mtd interface for YAFFS2 */
+
+/* XXX U-BOOT XXX */
+#include <common.h>
+#include "asm/errno.h"
+
+const char *yaffs_mtdif2_c_version =
+    "$Id: yaffs_mtdif2.c,v 1.17 2007/02/14 01:09:06 wookey Exp $";
+
+#include "yportenv.h"
+
+
+#include "yaffs_mtdif2.h"
+
+#include "linux/mtd/mtd.h"
+#include "linux/types.h"
+#include "linux/time.h"
+
+#include "yaffs_packedtags2.h"
+
+int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device * dev, int chunkInNAND,
+				      const __u8 * data,
+				      const yaffs_ExtendedTags * tags)
+{
+	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
+	struct mtd_oob_ops ops;
+#else
+	size_t dummy;
+#endif
+	int retval = 0;
+
+	loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
+
+	yaffs_PackedTags2 pt;
+
+	T(YAFFS_TRACE_MTD,
+	  (TSTR
+	   ("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p"
+	    TENDSTR), chunkInNAND, data, tags));
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
+	if (tags)
+		yaffs_PackTags2(&pt, tags);
+	else
+		BUG(); /* both tags and data should always be present */
+
+	if (data) {
+		ops.mode = MTD_OOB_AUTO;
+		ops.ooblen = sizeof(pt);
+		ops.len = dev->nDataBytesPerChunk;
+		ops.ooboffs = 0;
+		ops.datbuf = (__u8 *)data;
+		ops.oobbuf = (void *)&pt;
+		retval = mtd->write_oob(mtd, addr, &ops);
+	} else
+		BUG(); /* both tags and data should always be present */
+#else
+	if (tags) {
+		yaffs_PackTags2(&pt, tags);
+	}
+
+	if (data && tags) {
+		if (dev->useNANDECC)
+			retval =
+			    mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
+					   &dummy, data, (__u8 *) & pt, NULL);
+		else
+			retval =
+			    mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
+					   &dummy, data, (__u8 *) & pt, NULL);
+	} else {
+		if (data)
+			retval =
+			    mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
+				       data);
+		if (tags)
+			retval =
+			    mtd->write_oob(mtd, addr, mtd->oobsize, &dummy,
+					   (__u8 *) & pt);
+
+	}
+#endif
+
+	if (retval == 0)
+		return YAFFS_OK;
+	else
+		return YAFFS_FAIL;
+}
+
+int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
+				       __u8 * data, yaffs_ExtendedTags * tags)
+{
+	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
+	struct mtd_oob_ops ops;
+#endif
+	size_t dummy;
+	int retval = 0;
+
+	loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
+
+	yaffs_PackedTags2 pt;
+
+	T(YAFFS_TRACE_MTD,
+	  (TSTR
+	   ("nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p"
+	    TENDSTR), chunkInNAND, data, tags));
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
+	if (data && !tags)
+		retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
+				&dummy, data);
+	else if (tags) {
+		ops.mode = MTD_OOB_AUTO;
+		ops.ooblen = sizeof(pt);
+		ops.len = data ? dev->nDataBytesPerChunk : sizeof(pt);
+		ops.ooboffs = 0;
+		ops.datbuf = data;
+		ops.oobbuf = dev->spareBuffer;
+		retval = mtd->read_oob(mtd, addr, &ops);
+	}
+#else
+	if (data && tags) {
+		if (dev->useNANDECC) {
+			retval =
+			    mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
+					  &dummy, data, dev->spareBuffer,
+					  NULL);
+		} else {
+			retval =
+			    mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
+					  &dummy, data, dev->spareBuffer,
+					  NULL);
+		}
+	} else {
+		if (data)
+			retval =
+			    mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
+				      data);
+		if (tags)
+			retval =
+			    mtd->read_oob(mtd, addr, mtd->oobsize, &dummy,
+					  dev->spareBuffer);
+	}
+#endif
+
+	memcpy(&pt, dev->spareBuffer, sizeof(pt));
+
+	if (tags)
+		yaffs_UnpackTags2(tags, &pt);
+	
+	if(tags && retval == -EBADMSG && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR)
+		tags->eccResult = YAFFS_ECC_RESULT_UNFIXED;
+
+	if (retval == 0)
+		return YAFFS_OK;
+	else
+		return YAFFS_FAIL;
+}
+
+int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
+{
+	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+	int retval;
+	T(YAFFS_TRACE_MTD,
+	  (TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR), blockNo));
+
+	retval =
+	    mtd->block_markbad(mtd,
+			       blockNo * dev->nChunksPerBlock *
+			       dev->nDataBytesPerChunk);
+
+	if (retval == 0)
+		return YAFFS_OK;
+	else
+		return YAFFS_FAIL;
+
+}
+
+int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
+			    yaffs_BlockState * state, int *sequenceNumber)
+{
+	struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+	int retval;
+
+	T(YAFFS_TRACE_MTD,
+	  (TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR), blockNo));
+	retval =
+	    mtd->block_isbad(mtd,
+			     blockNo * dev->nChunksPerBlock *
+			     dev->nDataBytesPerChunk);
+
+	if (retval) {
+		T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR)));
+
+		*state = YAFFS_BLOCK_STATE_DEAD;
+		*sequenceNumber = 0;
+	} else {
+		yaffs_ExtendedTags t;
+		nandmtd2_ReadChunkWithTagsFromNAND(dev,
+						   blockNo *
+						   dev->nChunksPerBlock, NULL,
+						   &t);
+
+		if (t.chunkUsed) {
+			*sequenceNumber = t.sequenceNumber;
+			*state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+		} else {
+			*sequenceNumber = 0;
+			*state = YAFFS_BLOCK_STATE_EMPTY;
+		}
+	}
+	T(YAFFS_TRACE_MTD,
+	  (TSTR("block is bad seq %d state %d" TENDSTR), *sequenceNumber,
+	   *state));
+
+	if (retval == 0)
+		return YAFFS_OK;
+	else
+		return YAFFS_FAIL;
+}

fs/yaffs2/yaffs_mtdif2.h

@@ -0,0 +1,29 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_MTDIF2_H__
+#define __YAFFS_MTDIF2_H__
+
+#include "yaffs_guts.h"
+int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device * dev, int chunkInNAND,
+				      const __u8 * data,
+				      const yaffs_ExtendedTags * tags);
+int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
+				       __u8 * data, yaffs_ExtendedTags * tags);
+int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo);
+int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
+			    yaffs_BlockState * state, int *sequenceNumber);
+
+#endif

fs/yaffs2/yaffs_nand.c

@@ -0,0 +1,134 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+ 
+/* XXX U-BOOT XXX */
+#include <common.h>
+
+const char *yaffs_nand_c_version =
+    "$Id: yaffs_nand.c,v 1.7 2007/02/14 01:09:06 wookey Exp $";
+
+#include "yaffs_nand.h"
+#include "yaffs_tagscompat.h"
+#include "yaffs_tagsvalidity.h"
+
+
+int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
+					   __u8 * buffer,
+					   yaffs_ExtendedTags * tags)
+{
+	int result;
+	yaffs_ExtendedTags localTags;
+	
+	int realignedChunkInNAND = chunkInNAND - dev->chunkOffset;
+	
+	/* If there are no tags provided, use local tags to get prioritised gc working */
+	if(!tags)
+		tags = &localTags;
+
+	if (dev->readChunkWithTagsFromNAND)
+		result = dev->readChunkWithTagsFromNAND(dev, realignedChunkInNAND, buffer,
+						      tags);
+	else
+		result = yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(dev,
+									realignedChunkInNAND,
+									buffer,
+									tags);	
+	if(tags && 
+	   tags->eccResult > YAFFS_ECC_RESULT_NO_ERROR){
+	
+		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, chunkInNAND/dev->nChunksPerBlock);
+                yaffs_HandleChunkError(dev,bi);
+	}
+								
+	return result;
+}
+
+int yaffs_WriteChunkWithTagsToNAND(yaffs_Device * dev,
+						   int chunkInNAND,
+						   const __u8 * buffer,
+						   yaffs_ExtendedTags * tags)
+{
+	chunkInNAND -= dev->chunkOffset;
+
+	
+	if (tags) {
+		tags->sequenceNumber = dev->sequenceNumber;
+		tags->chunkUsed = 1;
+		if (!yaffs_ValidateTags(tags)) {
+			T(YAFFS_TRACE_ERROR,
+			  (TSTR("Writing uninitialised tags" TENDSTR)));
+			YBUG();
+		}
+		T(YAFFS_TRACE_WRITE,
+		  (TSTR("Writing chunk %d tags %d %d" TENDSTR), chunkInNAND,
+		   tags->objectId, tags->chunkId));
+	} else {
+		T(YAFFS_TRACE_ERROR, (TSTR("Writing with no tags" TENDSTR)));
+		YBUG();
+	}
+
+	if (dev->writeChunkWithTagsToNAND)
+		return dev->writeChunkWithTagsToNAND(dev, chunkInNAND, buffer,
+						     tags);
+	else
+		return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,
+								       chunkInNAND,
+								       buffer,
+								       tags);
+}
+
+int yaffs_MarkBlockBad(yaffs_Device * dev, int blockNo)
+{
+	blockNo -= dev->blockOffset;
+
+;
+	if (dev->markNANDBlockBad)
+		return dev->markNANDBlockBad(dev, blockNo);
+	else
+		return yaffs_TagsCompatabilityMarkNANDBlockBad(dev, blockNo);
+}
+
+int yaffs_QueryInitialBlockState(yaffs_Device * dev,
+						 int blockNo,
+						 yaffs_BlockState * state,
+						 unsigned *sequenceNumber)
+{
+	blockNo -= dev->blockOffset;
+
+	if (dev->queryNANDBlock)
+		return dev->queryNANDBlock(dev, blockNo, state, sequenceNumber);
+	else
+		return yaffs_TagsCompatabilityQueryNANDBlock(dev, blockNo,
+							     state,
+							     sequenceNumber);
+}
+
+
+int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
+				  int blockInNAND)
+{
+	int result;
+
+	blockInNAND -= dev->blockOffset;
+
+
+	dev->nBlockErasures++;
+	result = dev->eraseBlockInNAND(dev, blockInNAND);
+
+	return result;
+}
+
+int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
+{
+	return dev->initialiseNAND(dev);
+}

fs/yaffs2/yaffs_nand.h

@@ -0,0 +1,44 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_NAND_H__
+#define __YAFFS_NAND_H__
+#include "yaffs_guts.h"
+
+
+
+int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
+					   __u8 * buffer,
+					   yaffs_ExtendedTags * tags);
+
+int yaffs_WriteChunkWithTagsToNAND(yaffs_Device * dev,
+						   int chunkInNAND,
+						   const __u8 * buffer,
+						   yaffs_ExtendedTags * tags);
+
+int yaffs_MarkBlockBad(yaffs_Device * dev, int blockNo);
+
+int yaffs_QueryInitialBlockState(yaffs_Device * dev,
+						 int blockNo,
+						 yaffs_BlockState * state,
+						 unsigned *sequenceNumber);
+
+int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
+				  int blockInNAND);
+
+int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev);
+
+#endif
+

fs/yaffs2/yaffs_nandemul2k.h

@@ -0,0 +1,39 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/* Interface to emulated NAND functions (2k page size) */
+
+#ifndef __YAFFS_NANDEMUL2K_H__
+#define __YAFFS_NANDEMUL2K_H__
+
+#include "yaffs_guts.h"
+
+int nandemul2k_WriteChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
+					int chunkInNAND, const __u8 * data,
+					yaffs_ExtendedTags * tags);
+int nandemul2k_ReadChunkWithTagsFromNAND(struct yaffs_DeviceStruct *dev,
+					 int chunkInNAND, __u8 * data,
+					 yaffs_ExtendedTags * tags);
+int nandemul2k_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo);
+int nandemul2k_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
+			      yaffs_BlockState * state, int *sequenceNumber);
+int nandemul2k_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
+				int blockInNAND);
+int nandemul2k_InitialiseNAND(struct yaffs_DeviceStruct *dev);
+int nandemul2k_GetBytesPerChunk(void);
+int nandemul2k_GetChunksPerBlock(void);
+int nandemul2k_GetNumberOfBlocks(void);
+
+#endif

fs/yaffs2/yaffs_packedtags1.c

@@ -0,0 +1,55 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* XXX U-BOOT XXX */
+#include <common.h>
+
+#include "yaffs_packedtags1.h"
+#include "yportenv.h"
+
+void yaffs_PackTags1(yaffs_PackedTags1 * pt, const yaffs_ExtendedTags * t)
+{
+	pt->chunkId = t->chunkId;
+	pt->serialNumber = t->serialNumber;
+	pt->byteCount = t->byteCount;
+	pt->objectId = t->objectId;
+	pt->ecc = 0;
+	pt->deleted = (t->chunkDeleted) ? 0 : 1;
+	pt->unusedStuff = 0;
+	pt->shouldBeFF = 0xFFFFFFFF;
+
+}
+
+void yaffs_UnpackTags1(yaffs_ExtendedTags * t, const yaffs_PackedTags1 * pt)
+{
+	static const __u8 allFF[] =
+	    { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+0xff };
+
+	if (memcmp(allFF, pt, sizeof(yaffs_PackedTags1))) {
+		t->blockBad = 0;
+		if (pt->shouldBeFF != 0xFFFFFFFF) {
+			t->blockBad = 1;
+		}
+		t->chunkUsed = 1;
+		t->objectId = pt->objectId;
+		t->chunkId = pt->chunkId;
+		t->byteCount = pt->byteCount;
+		t->eccResult = YAFFS_ECC_RESULT_NO_ERROR;
+		t->chunkDeleted = (pt->deleted) ? 0 : 1;
+		t->serialNumber = pt->serialNumber;
+	} else {
+		memset(t, 0, sizeof(yaffs_ExtendedTags));
+
+	}
+}

fs/yaffs2/yaffs_packedtags1.h

@@ -0,0 +1,37 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/* This is used to pack YAFFS1 tags, not YAFFS2 tags. */
+
+#ifndef __YAFFS_PACKEDTAGS1_H__
+#define __YAFFS_PACKEDTAGS1_H__
+
+#include "yaffs_guts.h"
+
+typedef struct {
+	unsigned chunkId:20;
+	unsigned serialNumber:2;
+	unsigned byteCount:10;
+	unsigned objectId:18;
+	unsigned ecc:12;
+	unsigned deleted:1;
+	unsigned unusedStuff:1;
+	unsigned shouldBeFF;
+
+} yaffs_PackedTags1;
+
+void yaffs_PackTags1(yaffs_PackedTags1 * pt, const yaffs_ExtendedTags * t);
+void yaffs_UnpackTags1(yaffs_ExtendedTags * t, const yaffs_PackedTags1 * pt);
+#endif

fs/yaffs2/yaffs_packedtags2.c

@@ -0,0 +1,185 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* XXX U-BOOT XXX */
+#include <common.h>
+
+#include "yaffs_packedtags2.h"
+#include "yportenv.h"
+#include "yaffs_tagsvalidity.h"
+
+/* This code packs a set of extended tags into a binary structure for
+ * NAND storage
+ */
+
+/* Some of the information is "extra" struff which can be packed in to
+ * speed scanning
+ * This is defined by having the EXTRA_HEADER_INFO_FLAG set.
+ */
+
+/* Extra flags applied to chunkId */
+
+#define EXTRA_HEADER_INFO_FLAG	0x80000000
+#define EXTRA_SHRINK_FLAG	0x40000000
+#define EXTRA_SHADOWS_FLAG	0x20000000
+#define EXTRA_SPARE_FLAGS	0x10000000
+
+#define ALL_EXTRA_FLAGS		0xF0000000
+
+/* Also, the top 4 bits of the object Id are set to the object type. */
+#define EXTRA_OBJECT_TYPE_SHIFT (28)
+#define EXTRA_OBJECT_TYPE_MASK  ((0x0F) << EXTRA_OBJECT_TYPE_SHIFT)
+
+static void yaffs_DumpPackedTags2(const yaffs_PackedTags2 * pt)
+{
+	T(YAFFS_TRACE_MTD,
+	  (TSTR("packed tags obj %d chunk %d byte %d seq %d" TENDSTR),
+	   pt->t.objectId, pt->t.chunkId, pt->t.byteCount,
+	   pt->t.sequenceNumber));
+}
+
+static void yaffs_DumpTags2(const yaffs_ExtendedTags * t)
+{
+	T(YAFFS_TRACE_MTD,
+	  (TSTR
+	   ("ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte "
+	    "%d del %d ser %d seq %d"
+	    TENDSTR), t->eccResult, t->blockBad, t->chunkUsed, t->objectId,
+	   t->chunkId, t->byteCount, t->chunkDeleted, t->serialNumber,
+	   t->sequenceNumber));
+
+}
+
+void yaffs_PackTags2(yaffs_PackedTags2 * pt, const yaffs_ExtendedTags * t)
+{
+	pt->t.chunkId = t->chunkId;
+	pt->t.sequenceNumber = t->sequenceNumber;
+	pt->t.byteCount = t->byteCount;
+	pt->t.objectId = t->objectId;
+
+	if (t->chunkId == 0 && t->extraHeaderInfoAvailable) {
+		/* Store the extra header info instead */
+		/* We save the parent object in the chunkId */
+		pt->t.chunkId = EXTRA_HEADER_INFO_FLAG
+			| t->extraParentObjectId;
+		if (t->extraIsShrinkHeader) {
+			pt->t.chunkId |= EXTRA_SHRINK_FLAG;
+		}
+		if (t->extraShadows) {
+			pt->t.chunkId |= EXTRA_SHADOWS_FLAG;
+		}
+
+		pt->t.objectId &= ~EXTRA_OBJECT_TYPE_MASK;
+		pt->t.objectId |=
+		    (t->extraObjectType << EXTRA_OBJECT_TYPE_SHIFT);
+
+		if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK) {
+			pt->t.byteCount = t->extraEquivalentObjectId;
+		} else if (t->extraObjectType == YAFFS_OBJECT_TYPE_FILE) {
+			pt->t.byteCount = t->extraFileLength;
+		} else {
+			pt->t.byteCount = 0;
+		}
+	}
+
+	yaffs_DumpPackedTags2(pt);
+	yaffs_DumpTags2(t);
+
+#ifndef YAFFS_IGNORE_TAGS_ECC
+	{
+		yaffs_ECCCalculateOther((unsigned char *)&pt->t,
+					sizeof(yaffs_PackedTags2TagsPart),
+					&pt->ecc);
+	}
+#endif
+}
+
+void yaffs_UnpackTags2(yaffs_ExtendedTags * t, yaffs_PackedTags2 * pt)
+{
+
+	memset(t, 0, sizeof(yaffs_ExtendedTags));
+
+	yaffs_InitialiseTags(t);
+
+	if (pt->t.sequenceNumber != 0xFFFFFFFF) {
+		/* Page is in use */
+#ifdef YAFFS_IGNORE_TAGS_ECC
+		{
+			t->eccResult = YAFFS_ECC_RESULT_NO_ERROR;
+		}
+#else
+		{
+			yaffs_ECCOther ecc;
+			int result;
+			yaffs_ECCCalculateOther((unsigned char *)&pt->t,
+						sizeof
+						(yaffs_PackedTags2TagsPart),
+						&ecc);
+			result =
+			    yaffs_ECCCorrectOther((unsigned char *)&pt->t,
+						  sizeof
+						  (yaffs_PackedTags2TagsPart),
+						  &pt->ecc, &ecc);
+			switch(result){
+				case 0: 
+					t->eccResult = YAFFS_ECC_RESULT_NO_ERROR; 
+					break;
+				case 1: 
+					t->eccResult = YAFFS_ECC_RESULT_FIXED;
+					break;
+				case -1:
+					t->eccResult = YAFFS_ECC_RESULT_UNFIXED;
+					break;
+				default:
+					t->eccResult = YAFFS_ECC_RESULT_UNKNOWN;
+			}
+		}
+#endif
+		t->blockBad = 0;
+		t->chunkUsed = 1;
+		t->objectId = pt->t.objectId;
+		t->chunkId = pt->t.chunkId;
+		t->byteCount = pt->t.byteCount;
+		t->chunkDeleted = 0;
+		t->serialNumber = 0;
+		t->sequenceNumber = pt->t.sequenceNumber;
+
+		/* Do extra header info stuff */
+
+		if (pt->t.chunkId & EXTRA_HEADER_INFO_FLAG) {
+			t->chunkId = 0;
+			t->byteCount = 0;
+
+			t->extraHeaderInfoAvailable = 1;
+			t->extraParentObjectId =
+			    pt->t.chunkId & (~(ALL_EXTRA_FLAGS));
+			t->extraIsShrinkHeader =
+			    (pt->t.chunkId & EXTRA_SHRINK_FLAG) ? 1 : 0;
+			t->extraShadows =
+			    (pt->t.chunkId & EXTRA_SHADOWS_FLAG) ? 1 : 0;
+			t->extraObjectType =
+			    pt->t.objectId >> EXTRA_OBJECT_TYPE_SHIFT;
+			t->objectId &= ~EXTRA_OBJECT_TYPE_MASK;
+
+			if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK) {
+				t->extraEquivalentObjectId = pt->t.byteCount;
+			} else {
+				t->extraFileLength = pt->t.byteCount;
+			}
+		}
+	}
+
+	yaffs_DumpPackedTags2(pt);
+	yaffs_DumpTags2(t);
+
+}

fs/yaffs2/yaffs_packedtags2.h

@@ -0,0 +1,38 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/* This is used to pack YAFFS2 tags, not YAFFS1tags. */
+
+#ifndef __YAFFS_PACKEDTAGS2_H__
+#define __YAFFS_PACKEDTAGS2_H__
+
+#include "yaffs_guts.h"
+#include "yaffs_ecc.h"
+
+typedef struct {
+	unsigned sequenceNumber;
+	unsigned objectId;
+	unsigned chunkId;
+	unsigned byteCount;
+} yaffs_PackedTags2TagsPart;
+
+typedef struct {
+	yaffs_PackedTags2TagsPart t;
+	yaffs_ECCOther ecc;
+} yaffs_PackedTags2;
+
+void yaffs_PackTags2(yaffs_PackedTags2 * pt, const yaffs_ExtendedTags * t);
+void yaffs_UnpackTags2(yaffs_ExtendedTags * t, yaffs_PackedTags2 * pt);
+#endif

fs/yaffs2/yaffs_qsort.c

@@ -0,0 +1,163 @@
+/*
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/* XXX U-BOOT XXX */
+#include <common.h>
+
+#include "yportenv.h"
+//#include <linux/string.h>
+
+/*
+ * Qsort routine from Bentley & McIlroy's "Engineering a Sort Function".
+ */
+#define swapcode(TYPE, parmi, parmj, n) { 		\
+	long i = (n) / sizeof (TYPE); 			\
+	register TYPE *pi = (TYPE *) (parmi); 		\
+	register TYPE *pj = (TYPE *) (parmj); 		\
+	do { 						\
+		register TYPE	t = *pi;		\
+		*pi++ = *pj;				\
+		*pj++ = t;				\
+        } while (--i > 0);				\
+}
+
+#define SWAPINIT(a, es) swaptype = ((char *)a - (char *)0) % sizeof(long) || \
+	es % sizeof(long) ? 2 : es == sizeof(long)? 0 : 1;
+
+static __inline void
+swapfunc(char *a, char *b, int n, int swaptype)
+{
+	if (swaptype <= 1) 
+		swapcode(long, a, b, n)
+	else
+		swapcode(char, a, b, n)
+}
+
+#define swap(a, b)					\
+	if (swaptype == 0) {				\
+		long t = *(long *)(a);			\
+		*(long *)(a) = *(long *)(b);		\
+		*(long *)(b) = t;			\
+	} else						\
+		swapfunc(a, b, es, swaptype)
+
+#define vecswap(a, b, n) 	if ((n) > 0) swapfunc(a, b, n, swaptype)
+
+static __inline char *
+med3(char *a, char *b, char *c, int (*cmp)(const void *, const void *))
+{
+	return cmp(a, b) < 0 ?
+	       (cmp(b, c) < 0 ? b : (cmp(a, c) < 0 ? c : a ))
+              :(cmp(b, c) > 0 ? b : (cmp(a, c) < 0 ? a : c ));
+}
+
+#ifndef min
+#define min(a,b) (((a) < (b)) ? (a) : (b))
+#endif
+
+void
+yaffs_qsort(void *aa, size_t n, size_t es,
+	int (*cmp)(const void *, const void *))
+{
+	char *pa, *pb, *pc, *pd, *pl, *pm, *pn;
+	int d, r, swaptype, swap_cnt;
+	register char *a = aa;
+
+loop:	SWAPINIT(a, es);
+	swap_cnt = 0;
+	if (n < 7) {
+		for (pm = (char *)a + es; pm < (char *) a + n * es; pm += es)
+			for (pl = pm; pl > (char *) a && cmp(pl - es, pl) > 0;
+			     pl -= es)
+				swap(pl, pl - es);
+		return;
+	}
+	pm = (char *)a + (n / 2) * es;
+	if (n > 7) {
+		pl = (char *)a;
+		pn = (char *)a + (n - 1) * es;
+		if (n > 40) {
+			d = (n / 8) * es;
+			pl = med3(pl, pl + d, pl + 2 * d, cmp);
+			pm = med3(pm - d, pm, pm + d, cmp);
+			pn = med3(pn - 2 * d, pn - d, pn, cmp);
+		}
+		pm = med3(pl, pm, pn, cmp);
+	}
+	swap(a, pm);
+	pa = pb = (char *)a + es;
+
+	pc = pd = (char *)a + (n - 1) * es;
+	for (;;) {
+		while (pb <= pc && (r = cmp(pb, a)) <= 0) {
+			if (r == 0) {
+				swap_cnt = 1;
+				swap(pa, pb);
+				pa += es;
+			}
+			pb += es;
+		}
+		while (pb <= pc && (r = cmp(pc, a)) >= 0) {
+			if (r == 0) {
+				swap_cnt = 1;
+				swap(pc, pd);
+				pd -= es;
+			}
+			pc -= es;
+		}
+		if (pb > pc)
+			break;
+		swap(pb, pc);
+		swap_cnt = 1;
+		pb += es;
+		pc -= es;
+	}
+	if (swap_cnt == 0) {  /* Switch to insertion sort */
+		for (pm = (char *) a + es; pm < (char *) a + n * es; pm += es)
+			for (pl = pm; pl > (char *) a && cmp(pl - es, pl) > 0; 
+			     pl -= es)
+				swap(pl, pl - es);
+		return;
+	}
+
+	pn = (char *)a + n * es;
+	r = min(pa - (char *)a, pb - pa);
+	vecswap(a, pb - r, r);
+	r = min((long)(pd - pc), (long)(pn - pd - es));
+	vecswap(pb, pn - r, r);
+	if ((r = pb - pa) > es)
+		yaffs_qsort(a, r / es, es, cmp);
+	if ((r = pd - pc) > es) { 
+		/* Iterate rather than recurse to save stack space */
+		a = pn - r;
+		n = r / es;
+		goto loop;
+	}
+/*		yaffs_qsort(pn - r, r / es, es, cmp);*/
+}

fs/yaffs2/yaffs_qsort.h

@@ -0,0 +1,23 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+
+#ifndef __YAFFS_QSORT_H__
+#define __YAFFS_QSORT_H__
+
+extern void yaffs_qsort (void *const base, size_t total_elems, size_t size,
+                   int (*cmp)(const void *, const void *));
+
+#endif

fs/yaffs2/yaffs_ramdisk.h

@@ -0,0 +1,32 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * yaffs_ramdisk.h: yaffs ram disk component
+ */
+
+#ifndef __YAFFS_RAMDISK_H__
+#define __YAFFS_RAMDISK_H__
+
+
+#include "yaffs_guts.h"
+int yramdisk_EraseBlockInNAND(yaffs_Device *dev, int blockNumber);
+int yramdisk_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND,const __u8 *data, yaffs_ExtendedTags *tags);
+int yramdisk_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *data, yaffs_ExtendedTags *tags);
+int yramdisk_EraseBlockInNAND(yaffs_Device *dev, int blockNumber);
+int yramdisk_InitialiseNAND(yaffs_Device *dev);
+int yramdisk_MarkNANDBlockBad(yaffs_Device *dev,int blockNumber);
+int yramdisk_QueryNANDBlock(yaffs_Device *dev, int blockNo, yaffs_BlockState *state, int *sequenceNumber);
+#endif

fs/yaffs2/yaffs_tagscompat.c

@@ -0,0 +1,533 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* XXX U-BOOT XXX */
+#include <common.h>
+
+#include "yaffs_guts.h"
+#include "yaffs_tagscompat.h"
+#include "yaffs_ecc.h"
+
+static void yaffs_HandleReadDataError(yaffs_Device * dev, int chunkInNAND);
+#ifdef NOTYET
+static void yaffs_CheckWrittenBlock(yaffs_Device * dev, int chunkInNAND);
+static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
+				     const __u8 * data,
+				     const yaffs_Spare * spare);
+static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
+				    const yaffs_Spare * spare);
+static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND);
+#endif
+
+static const char yaffs_countBitsTable[256] = {
+	0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
+	1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
+	1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
+	1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
+	2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
+	3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
+	3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
+	4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
+};
+
+int yaffs_CountBits(__u8 x)
+{
+	int retVal;
+	retVal = yaffs_countBitsTable[x];
+	return retVal;
+}
+
+/********** Tags ECC calculations  *********/
+
+void yaffs_CalcECC(const __u8 * data, yaffs_Spare * spare)
+{
+	yaffs_ECCCalculate(data, spare->ecc1);
+	yaffs_ECCCalculate(&data[256], spare->ecc2);
+}
+
+void yaffs_CalcTagsECC(yaffs_Tags * tags)
+{
+	/* Calculate an ecc */
+
+	unsigned char *b = ((yaffs_TagsUnion *) tags)->asBytes;
+	unsigned i, j;
+	unsigned ecc = 0;
+	unsigned bit = 0;
+
+	tags->ecc = 0;
+
+	for (i = 0; i < 8; i++) {
+		for (j = 1; j & 0xff; j <<= 1) {
+			bit++;
+			if (b[i] & j) {
+				ecc ^= bit;
+			}
+		}
+	}
+
+	tags->ecc = ecc;
+
+}
+
+int yaffs_CheckECCOnTags(yaffs_Tags * tags)
+{
+	unsigned ecc = tags->ecc;
+
+	yaffs_CalcTagsECC(tags);
+
+	ecc ^= tags->ecc;
+
+	if (ecc && ecc <= 64) {
+		/* TODO: Handle the failure better. Retire? */
+		unsigned char *b = ((yaffs_TagsUnion *) tags)->asBytes;
+
+		ecc--;
+
+		b[ecc / 8] ^= (1 << (ecc & 7));
+
+		/* Now recvalc the ecc */
+		yaffs_CalcTagsECC(tags);
+
+		return 1;	/* recovered error */
+	} else if (ecc) {
+		/* Wierd ecc failure value */
+		/* TODO Need to do somethiong here */
+		return -1;	/* unrecovered error */
+	}
+
+	return 0;
+}
+
+/********** Tags **********/
+
+static void yaffs_LoadTagsIntoSpare(yaffs_Spare * sparePtr,
+				    yaffs_Tags * tagsPtr)
+{
+	yaffs_TagsUnion *tu = (yaffs_TagsUnion *) tagsPtr;
+
+	yaffs_CalcTagsECC(tagsPtr);
+
+	sparePtr->tagByte0 = tu->asBytes[0];
+	sparePtr->tagByte1 = tu->asBytes[1];
+	sparePtr->tagByte2 = tu->asBytes[2];
+	sparePtr->tagByte3 = tu->asBytes[3];
+	sparePtr->tagByte4 = tu->asBytes[4];
+	sparePtr->tagByte5 = tu->asBytes[5];
+	sparePtr->tagByte6 = tu->asBytes[6];
+	sparePtr->tagByte7 = tu->asBytes[7];
+}
+
+static void yaffs_GetTagsFromSpare(yaffs_Device * dev, yaffs_Spare * sparePtr,
+				   yaffs_Tags * tagsPtr)
+{
+	yaffs_TagsUnion *tu = (yaffs_TagsUnion *) tagsPtr;
+	int result;
+
+	tu->asBytes[0] = sparePtr->tagByte0;
+	tu->asBytes[1] = sparePtr->tagByte1;
+	tu->asBytes[2] = sparePtr->tagByte2;
+	tu->asBytes[3] = sparePtr->tagByte3;
+	tu->asBytes[4] = sparePtr->tagByte4;
+	tu->asBytes[5] = sparePtr->tagByte5;
+	tu->asBytes[6] = sparePtr->tagByte6;
+	tu->asBytes[7] = sparePtr->tagByte7;
+
+	result = yaffs_CheckECCOnTags(tagsPtr);
+	if (result > 0) {
+		dev->tagsEccFixed++;
+	} else if (result < 0) {
+		dev->tagsEccUnfixed++;
+	}
+}
+
+static void yaffs_SpareInitialise(yaffs_Spare * spare)
+{
+	memset(spare, 0xFF, sizeof(yaffs_Spare));
+}
+
+static int yaffs_WriteChunkToNAND(struct yaffs_DeviceStruct *dev,
+				  int chunkInNAND, const __u8 * data,
+				  yaffs_Spare * spare)
+{
+	if (chunkInNAND < dev->startBlock * dev->nChunksPerBlock) {
+		T(YAFFS_TRACE_ERROR,
+		  (TSTR("**>> yaffs chunk %d is not valid" TENDSTR),
+		   chunkInNAND));
+		return YAFFS_FAIL;
+	}
+
+	dev->nPageWrites++;
+	return dev->writeChunkToNAND(dev, chunkInNAND, data, spare);
+}
+
+static int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev,
+				   int chunkInNAND,
+				   __u8 * data,
+				   yaffs_Spare * spare,
+				   yaffs_ECCResult * eccResult,
+				   int doErrorCorrection)
+{
+	int retVal;
+	yaffs_Spare localSpare;
+
+	dev->nPageReads++;
+
+	if (!spare && data) {
+		/* If we don't have a real spare, then we use a local one. */
+		/* Need this for the calculation of the ecc */
+		spare = &localSpare;
+	}
+
+	if (!dev->useNANDECC) {
+		retVal = dev->readChunkFromNAND(dev, chunkInNAND, data, spare);
+		if (data && doErrorCorrection) {
+			/* Do ECC correction */
+			/* Todo handle any errors */
+			int eccResult1, eccResult2;
+			__u8 calcEcc[3];
+
+			yaffs_ECCCalculate(data, calcEcc);
+			eccResult1 =
+			    yaffs_ECCCorrect(data, spare->ecc1, calcEcc);
+			yaffs_ECCCalculate(&data[256], calcEcc);
+			eccResult2 =
+			    yaffs_ECCCorrect(&data[256], spare->ecc2, calcEcc);
+
+			if (eccResult1 > 0) {
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR
+				   ("**>>yaffs ecc error fix performed on chunk %d:0"
+				    TENDSTR), chunkInNAND));
+				dev->eccFixed++;
+			} else if (eccResult1 < 0) {
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR
+				   ("**>>yaffs ecc error unfixed on chunk %d:0"
+				    TENDSTR), chunkInNAND));
+				dev->eccUnfixed++;
+			}
+
+			if (eccResult2 > 0) {
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR
+				   ("**>>yaffs ecc error fix performed on chunk %d:1"
+				    TENDSTR), chunkInNAND));
+				dev->eccFixed++;
+			} else if (eccResult2 < 0) {
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR
+				   ("**>>yaffs ecc error unfixed on chunk %d:1"
+				    TENDSTR), chunkInNAND));
+				dev->eccUnfixed++;
+			}
+
+			if (eccResult1 || eccResult2) {
+				/* We had a data problem on this page */
+				yaffs_HandleReadDataError(dev, chunkInNAND);
+			}
+
+			if (eccResult1 < 0 || eccResult2 < 0)
+				*eccResult = YAFFS_ECC_RESULT_UNFIXED;
+			else if (eccResult1 > 0 || eccResult2 > 0)
+				*eccResult = YAFFS_ECC_RESULT_FIXED;
+			else
+				*eccResult = YAFFS_ECC_RESULT_NO_ERROR;
+		}
+	} else {
+		/* Must allocate enough memory for spare+2*sizeof(int) */
+		/* for ecc results from device. */
+		struct yaffs_NANDSpare nspare;
+		retVal =
+		    dev->readChunkFromNAND(dev, chunkInNAND, data,
+					   (yaffs_Spare *) & nspare);
+		memcpy(spare, &nspare, sizeof(yaffs_Spare));
+		if (data && doErrorCorrection) {
+			if (nspare.eccres1 > 0) {
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR
+				   ("**>>mtd ecc error fix performed on chunk %d:0"
+				    TENDSTR), chunkInNAND));
+			} else if (nspare.eccres1 < 0) {
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR
+				   ("**>>mtd ecc error unfixed on chunk %d:0"
+				    TENDSTR), chunkInNAND));
+			}
+
+			if (nspare.eccres2 > 0) {
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR
+				   ("**>>mtd ecc error fix performed on chunk %d:1"
+				    TENDSTR), chunkInNAND));
+			} else if (nspare.eccres2 < 0) {
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR
+				   ("**>>mtd ecc error unfixed on chunk %d:1"
+				    TENDSTR), chunkInNAND));
+			}
+
+			if (nspare.eccres1 || nspare.eccres2) {
+				/* We had a data problem on this page */
+				yaffs_HandleReadDataError(dev, chunkInNAND);
+			}
+
+			if (nspare.eccres1 < 0 || nspare.eccres2 < 0)
+				*eccResult = YAFFS_ECC_RESULT_UNFIXED;
+			else if (nspare.eccres1 > 0 || nspare.eccres2 > 0)
+				*eccResult = YAFFS_ECC_RESULT_FIXED;
+			else
+				*eccResult = YAFFS_ECC_RESULT_NO_ERROR;
+
+		}
+	}
+	return retVal;
+}
+
+#ifdef NOTYET
+static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
+				  int chunkInNAND)
+{
+
+	static int init = 0;
+	static __u8 cmpbuf[YAFFS_BYTES_PER_CHUNK];
+	static __u8 data[YAFFS_BYTES_PER_CHUNK];
+	/* Might as well always allocate the larger size for */
+	/* dev->useNANDECC == true; */
+	static __u8 spare[sizeof(struct yaffs_NANDSpare)];
+
+	dev->readChunkFromNAND(dev, chunkInNAND, data, (yaffs_Spare *) spare);
+
+	if (!init) {
+		memset(cmpbuf, 0xff, YAFFS_BYTES_PER_CHUNK);
+		init = 1;
+	}
+
+	if (memcmp(cmpbuf, data, YAFFS_BYTES_PER_CHUNK))
+		return YAFFS_FAIL;
+	if (memcmp(cmpbuf, spare, 16))
+		return YAFFS_FAIL;
+
+	return YAFFS_OK;
+
+}
+#endif
+
+/*
+ * Functions for robustisizing
+ */
+
+static void yaffs_HandleReadDataError(yaffs_Device * dev, int chunkInNAND)
+{
+	int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
+
+	/* Mark the block for retirement */
+	yaffs_GetBlockInfo(dev, blockInNAND)->needsRetiring = 1;
+	T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+	  (TSTR("**>>Block %d marked for retirement" TENDSTR), blockInNAND));
+
+	/* TODO:
+	 * Just do a garbage collection on the affected block
+	 * then retire the block
+	 * NB recursion
+	 */
+}
+
+#ifdef NOTYET
+static void yaffs_CheckWrittenBlock(yaffs_Device * dev, int chunkInNAND)
+{
+}
+
+static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
+				     const __u8 * data,
+				     const yaffs_Spare * spare)
+{
+}
+
+static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
+				    const yaffs_Spare * spare)
+{
+}
+
+static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND)
+{
+	int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
+
+	/* Mark the block for retirement */
+	yaffs_GetBlockInfo(dev, blockInNAND)->needsRetiring = 1;
+	/* Delete the chunk */
+	yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
+}
+
+static int yaffs_VerifyCompare(const __u8 * d0, const __u8 * d1,
+			       const yaffs_Spare * s0, const yaffs_Spare * s1)
+{
+
+	if (memcmp(d0, d1, YAFFS_BYTES_PER_CHUNK) != 0 ||
+	    s0->tagByte0 != s1->tagByte0 ||
+	    s0->tagByte1 != s1->tagByte1 ||
+	    s0->tagByte2 != s1->tagByte2 ||
+	    s0->tagByte3 != s1->tagByte3 ||
+	    s0->tagByte4 != s1->tagByte4 ||
+	    s0->tagByte5 != s1->tagByte5 ||
+	    s0->tagByte6 != s1->tagByte6 ||
+	    s0->tagByte7 != s1->tagByte7 ||
+	    s0->ecc1[0] != s1->ecc1[0] ||
+	    s0->ecc1[1] != s1->ecc1[1] ||
+	    s0->ecc1[2] != s1->ecc1[2] ||
+	    s0->ecc2[0] != s1->ecc2[0] ||
+	    s0->ecc2[1] != s1->ecc2[1] || s0->ecc2[2] != s1->ecc2[2]) {
+		return 0;
+	}
+
+	return 1;
+}
+#endif				/* NOTYET */
+
+int yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(yaffs_Device * dev,
+						    int chunkInNAND,
+						    const __u8 * data,
+						    const yaffs_ExtendedTags *
+						    eTags)
+{
+	yaffs_Spare spare;
+	yaffs_Tags tags;
+
+	yaffs_SpareInitialise(&spare);
+
+	if (eTags->chunkDeleted) {
+		spare.pageStatus = 0;
+	} else {
+		tags.objectId = eTags->objectId;
+		tags.chunkId = eTags->chunkId;
+		tags.byteCount = eTags->byteCount;
+		tags.serialNumber = eTags->serialNumber;
+
+		if (!dev->useNANDECC && data) {
+			yaffs_CalcECC(data, &spare);
+		}
+		yaffs_LoadTagsIntoSpare(&spare, &tags);
+
+	}
+
+	return yaffs_WriteChunkToNAND(dev, chunkInNAND, data, &spare);
+}
+
+int yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(yaffs_Device * dev,
+						     int chunkInNAND,
+						     __u8 * data,
+						     yaffs_ExtendedTags * eTags)
+{
+
+	yaffs_Spare spare;
+	yaffs_Tags tags;
+	yaffs_ECCResult eccResult;
+
+	static yaffs_Spare spareFF;
+	static int init;
+
+	if (!init) {
+		memset(&spareFF, 0xFF, sizeof(spareFF));
+		init = 1;
+	}
+
+	if (yaffs_ReadChunkFromNAND
+	    (dev, chunkInNAND, data, &spare, &eccResult, 1)) {
+		/* eTags may be NULL */
+		if (eTags) {
+
+			int deleted =
+			    (yaffs_CountBits(spare.pageStatus) < 7) ? 1 : 0;
+
+			eTags->chunkDeleted = deleted;
+			eTags->eccResult = eccResult;
+			eTags->blockBad = 0;	/* We're reading it */
+			/* therefore it is not a bad block */
+			eTags->chunkUsed =
+			    (memcmp(&spareFF, &spare, sizeof(spareFF)) !=
+			     0) ? 1 : 0;
+
+			if (eTags->chunkUsed) {
+				yaffs_GetTagsFromSpare(dev, &spare, &tags);
+
+				eTags->objectId = tags.objectId;
+				eTags->chunkId = tags.chunkId;
+				eTags->byteCount = tags.byteCount;
+				eTags->serialNumber = tags.serialNumber;
+			}
+		}
+
+		return YAFFS_OK;
+	} else {
+		return YAFFS_FAIL;
+	}
+}
+
+int yaffs_TagsCompatabilityMarkNANDBlockBad(struct yaffs_DeviceStruct *dev,
+					    int blockInNAND)
+{
+
+	yaffs_Spare spare;
+
+	memset(&spare, 0xff, sizeof(yaffs_Spare));
+
+	spare.blockStatus = 'Y';
+
+	yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock, NULL,
+			       &spare);
+	yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock + 1,
+			       NULL, &spare);
+
+	return YAFFS_OK;
+
+}
+
+int yaffs_TagsCompatabilityQueryNANDBlock(struct yaffs_DeviceStruct *dev,
+					  int blockNo, yaffs_BlockState *
+					  state,
+					  int *sequenceNumber)
+{
+
+	yaffs_Spare spare0, spare1;
+	static yaffs_Spare spareFF;
+	static int init;
+	yaffs_ECCResult dummy;
+
+	if (!init) {
+		memset(&spareFF, 0xFF, sizeof(spareFF));
+		init = 1;
+	}
+
+	*sequenceNumber = 0;
+
+	yaffs_ReadChunkFromNAND(dev, blockNo * dev->nChunksPerBlock, NULL,
+				&spare0, &dummy, 1);
+	yaffs_ReadChunkFromNAND(dev, blockNo * dev->nChunksPerBlock + 1, NULL,
+				&spare1, &dummy, 1);
+
+	if (yaffs_CountBits(spare0.blockStatus & spare1.blockStatus) < 7)
+		*state = YAFFS_BLOCK_STATE_DEAD;
+	else if (memcmp(&spareFF, &spare0, sizeof(spareFF)) == 0)
+		*state = YAFFS_BLOCK_STATE_EMPTY;
+	else
+		*state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
+
+	return YAFFS_OK;
+}

fs/yaffs2/yaffs_tagscompat.h

@@ -0,0 +1,40 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_TAGSCOMPAT_H__
+#define __YAFFS_TAGSCOMPAT_H__
+
+#include "yaffs_guts.h"
+int yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(yaffs_Device * dev,
+						    int chunkInNAND,
+						    const __u8 * data,
+						    const yaffs_ExtendedTags *
+						    tags);
+int yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(yaffs_Device * dev,
+						     int chunkInNAND,
+						     __u8 * data,
+						     yaffs_ExtendedTags *
+						     tags);
+int yaffs_TagsCompatabilityMarkNANDBlockBad(struct yaffs_DeviceStruct *dev,
+					    int blockNo);
+int yaffs_TagsCompatabilityQueryNANDBlock(struct yaffs_DeviceStruct *dev,
+					  int blockNo, yaffs_BlockState *
+					  state, int *sequenceNumber);
+
+void yaffs_CalcTagsECC(yaffs_Tags * tags);
+int yaffs_CheckECCOnTags(yaffs_Tags * tags);
+int yaffs_CountBits(__u8 byte);
+
+#endif

fs/yaffs2/yaffs_tagsvalidity.c

@@ -0,0 +1,31 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* XXX U-BOOT XXX */
+#include <common.h>
+
+#include "yaffs_tagsvalidity.h"
+
+void yaffs_InitialiseTags(yaffs_ExtendedTags * tags)
+{
+	memset(tags, 0, sizeof(yaffs_ExtendedTags));
+	tags->validMarker0 = 0xAAAAAAAA;
+	tags->validMarker1 = 0x55555555;
+}
+
+int yaffs_ValidateTags(yaffs_ExtendedTags * tags)
+{
+	return (tags->validMarker0 == 0xAAAAAAAA &&
+		tags->validMarker1 == 0x55555555);
+
+}

fs/yaffs2/yaffs_tagsvalidity.h

@@ -0,0 +1,24 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+
+#ifndef __YAFFS_TAGS_VALIDITY_H__
+#define __YAFFS_TAGS_VALIDITY_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_InitialiseTags(yaffs_ExtendedTags * tags);
+int yaffs_ValidateTags(yaffs_ExtendedTags * tags);
+#endif

fs/yaffs2/yaffscfg.c

@@ -0,0 +1,417 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * yaffscfg.c  The configuration for the "direct" use of yaffs.
+ *
+ * This file is intended to be modified to your requirements.
+ * There is no need to redistribute this file.
+ */
+
+/* XXX U-BOOT XXX */
+#include <common.h>
+
+#include <config.h>
+#include "nand.h"
+#include "yaffscfg.h"
+#include "yaffsfs.h"
+#include "yaffs_packedtags2.h"
+#include "yaffs_mtdif.h"
+#include "yaffs_mtdif2.h"
+#if 0
+#include <errno.h>
+#else
+#include "malloc.h"
+#endif
+
+unsigned yaffs_traceMask = 0xFFFFFFFF;
+static int yaffs_errno = 0;
+
+void yaffsfs_SetError(int err)
+{
+	//Do whatever to set error
+	yaffs_errno = err;
+}
+
+int yaffsfs_GetError(void)
+{
+	return yaffs_errno;
+}
+
+void yaffsfs_Lock(void)
+{
+}
+
+void yaffsfs_Unlock(void)
+{
+}
+
+__u32 yaffsfs_CurrentTime(void)
+{
+	return 0;
+}
+
+void *yaffs_malloc(size_t size)
+{
+	return malloc(size);
+}
+
+void yaffs_free(void *ptr)
+{
+	free(ptr);
+}
+
+void yaffsfs_LocalInitialisation(void)
+{
+	// Define locking semaphore.
+}
+
+// Configuration for:
+// /ram  2MB ramdisk
+// /boot 2MB boot disk (flash)
+// /flash 14MB flash disk (flash)
+// NB Though /boot and /flash occupy the same physical device they
+// are still disticnt "yaffs_Devices. You may think of these as "partitions"
+// using non-overlapping areas in the same device.
+// 
+
+#include "yaffs_ramdisk.h"
+#include "yaffs_flashif.h"
+
+static int isMounted = 0;
+#define MOUNT_POINT "/flash"
+extern nand_info_t nand_info[];
+
+/* XXX U-BOOT XXX */
+#if 0
+static yaffs_Device ramDev;
+static yaffs_Device bootDev;
+static yaffs_Device flashDev;
+#endif
+
+static yaffsfs_DeviceConfiguration yaffsfs_config[] = {
+/* XXX U-BOOT XXX */
+#if 0
+	{ "/ram", &ramDev},
+	{ "/boot", &bootDev},
+	{ "/flash", &flashDev},
+#else
+	{ MOUNT_POINT, 0},
+#endif
+	{(void *)0,(void *)0}
+};
+
+
+int yaffs_StartUp(void)
+{
+	struct mtd_info *mtd = &nand_info[0];
+	int yaffsVersion = 2;
+	int nBlocks;
+
+	yaffs_Device *flashDev = calloc(1, sizeof(yaffs_Device));
+	yaffsfs_config[0].dev = flashDev;
+
+	// Stuff to configure YAFFS
+	// Stuff to initialise anything special (eg lock semaphore).
+	yaffsfs_LocalInitialisation();
+	
+	// Set up devices
+
+/* XXX U-BOOT XXX */
+#if 0
+	// /ram
+	ramDev.nBytesPerChunk = 512;
+	ramDev.nChunksPerBlock = 32;
+	ramDev.nReservedBlocks = 2; // Set this smaller for RAM
+	ramDev.startBlock = 1; // Can't use block 0
+	ramDev.endBlock = 127; // Last block in 2MB.	
+	ramDev.useNANDECC = 1;
+	ramDev.nShortOpCaches = 0;	// Disable caching on this device.
+	ramDev.genericDevice = (void *) 0;	// Used to identify the device in fstat.
+	ramDev.writeChunkWithTagsToNAND = yramdisk_WriteChunkWithTagsToNAND;
+	ramDev.readChunkWithTagsFromNAND = yramdisk_ReadChunkWithTagsFromNAND;
+	ramDev.eraseBlockInNAND = yramdisk_EraseBlockInNAND;
+	ramDev.initialiseNAND = yramdisk_InitialiseNAND;
+
+	// /boot
+	bootDev.nBytesPerChunk = 612;
+	bootDev.nChunksPerBlock = 32;
+	bootDev.nReservedBlocks = 5;
+	bootDev.startBlock = 1; // Can't use block 0
+	bootDev.endBlock = 127; // Last block in 2MB.	
+	bootDev.useNANDECC = 0; // use YAFFS's ECC
+	bootDev.nShortOpCaches = 10; // Use caches
+	bootDev.genericDevice = (void *) 1;	// Used to identify the device in fstat.
+	bootDev.writeChunkToNAND = yflash_WriteChunkToNAND;
+	bootDev.readChunkFromNAND = yflash_ReadChunkFromNAND;
+	bootDev.eraseBlockInNAND = yflash_EraseBlockInNAND;
+	bootDev.initialiseNAND = yflash_InitialiseNAND;
+#endif
+
+		// /flash
+	flashDev->nReservedBlocks = 5;
+//  flashDev->nShortOpCaches = (options.no_cache) ? 0 : 10;
+	flashDev->nShortOpCaches = 10; // Use caches
+	flashDev->useNANDECC = 0; // do not use YAFFS's ECC
+
+	if (yaffsVersion == 2)
+	{
+		flashDev->writeChunkWithTagsToNAND = nandmtd2_WriteChunkWithTagsToNAND;
+		flashDev->readChunkWithTagsFromNAND = nandmtd2_ReadChunkWithTagsFromNAND;
+		flashDev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
+		flashDev->queryNANDBlock = nandmtd2_QueryNANDBlock;
+		flashDev->spareBuffer = YMALLOC(mtd->oobsize);
+		flashDev->isYaffs2 = 1;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
+		flashDev->nDataBytesPerChunk = mtd->writesize;
+		flashDev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
+#else
+		flashDev->nDataBytesPerChunk = mtd->oobblock;
+		flashDev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
+#endif
+		nBlocks = mtd->size / mtd->erasesize;
+
+		flashDev->nCheckpointReservedBlocks = 10;
+		flashDev->startBlock = 0;
+		flashDev->endBlock = nBlocks - 1;
+	}
+	else
+	{
+		flashDev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
+		flashDev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
+		flashDev->isYaffs2 = 0;
+		nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
+		flashDev->startBlock = 320;
+		flashDev->endBlock = nBlocks - 1;
+		flashDev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
+		flashDev->nDataBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
+	}
+	
+	/* ... and common functions */
+	flashDev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
+	flashDev->initialiseNAND = nandmtd_InitialiseNAND;
+
+	yaffs_initialise(yaffsfs_config);
+	
+	return 0;
+}
+
+
+void make_a_file(char *yaffsName,char bval,int sizeOfFile)
+{
+	int outh;
+	int i;
+	unsigned char buffer[100];
+
+	outh = yaffs_open(yaffsName, O_CREAT | O_RDWR | O_TRUNC, S_IREAD | S_IWRITE);
+	if (outh < 0)
+	{
+		printf("Error opening file: %d\n", outh);
+		return;
+	}
+	
+	memset(buffer,bval,100);
+	
+	do{
+		i = sizeOfFile;
+		if(i > 100) i = 100;
+		sizeOfFile -= i;
+		
+		yaffs_write(outh,buffer,i);
+		
+	} while (sizeOfFile > 0);
+	
+		
+	yaffs_close(outh);
+}
+
+void read_a_file(char *fn)
+{
+	int h;
+	int i = 0;
+	unsigned char b;
+
+	h = yaffs_open(fn, O_RDWR,0);
+	if(h<0)
+	{
+		printf("File not found\n");
+		return;
+	}
+
+	while(yaffs_read(h,&b,1)> 0)
+	{
+		printf("%02x ",b);
+		i++;
+		if(i > 32) 
+		{
+		   printf("\n");
+		   i = 0;;
+		 }
+	}
+	printf("\n");
+	yaffs_close(h);
+}
+
+void cmd_yaffs_mount(char *mp)
+{
+	yaffs_StartUp();
+	int retval = yaffs_mount(mp);
+	if( retval != -1)
+		isMounted = 1;
+	else
+		printf("Error mounting %s, return value: %d\n", mp, yaffsfs_GetError());
+}
+
+static void checkMount(void)
+{
+	if( !isMounted )
+	{
+		cmd_yaffs_mount(MOUNT_POINT);
+	}
+}
+
+void cmd_yaffs_umount(char *mp)
+{
+	checkMount();
+	if( yaffs_unmount(mp) == -1)
+		printf("Error umounting %s, return value: %d\n", mp, yaffsfs_GetError());
+}
+
+void cmd_yaffs_write_file(char *yaffsName,char bval,int sizeOfFile)
+{
+	checkMount();
+	make_a_file(yaffsName,bval,sizeOfFile);
+}
+
+
+void cmd_yaffs_read_file(char *fn)
+{
+	checkMount();
+	read_a_file(fn);
+}
+
+
+void cmd_yaffs_mread_file(char *fn, char *addr)
+{
+	int h;
+	struct yaffs_stat s;
+	
+	checkMount();
+
+	yaffs_stat(fn,&s);
+
+	printf ("Copy %s to 0x%08x... ", fn, addr);
+	h = yaffs_open(fn, O_RDWR,0);
+	if(h<0)
+	{
+		printf("File not found\n");
+		return;
+	}
+				
+	yaffs_read(h,addr,(int)s.st_size);
+	printf("\t[DONE]\n");
+
+	yaffs_close(h);
+}
+
+
+void cmd_yaffs_mwrite_file(char *fn, char *addr, int size)
+{
+	int outh;
+
+	checkMount();
+	outh = yaffs_open(fn, O_CREAT | O_RDWR | O_TRUNC, S_IREAD | S_IWRITE);
+	if (outh < 0)
+	{
+		printf("Error opening file: %d\n", outh);
+	}
+	
+	yaffs_write(outh,addr,size);
+	
+	yaffs_close(outh);
+}
+
+
+void cmd_yaffs_ls(const char *mountpt, int longlist)
+{
+	int i;
+	yaffs_DIR *d;
+	yaffs_dirent *de;
+	struct yaffs_stat stat;
+	char tempstr[255];
+
+	checkMount();
+	d = yaffs_opendir(mountpt);
+
+	if(!d)
+	{
+		printf("opendir failed\n");
+	}
+	else
+	{
+		for(i = 0; (de = yaffs_readdir(d)) != NULL; i++)
+		{
+			if (longlist)
+			{
+				sprintf(tempstr, "%s/%s", mountpt, de->d_name);
+				yaffs_stat(tempstr, &stat);
+				printf("%-25s\t%7d\n",de->d_name, stat.st_size);
+			}
+			else
+			{
+				printf("%s\n",de->d_name);
+			}
+		}
+	}
+}
+
+
+void cmd_yaffs_mkdir(const char *dir)
+{
+	checkMount();
+
+	int retval = yaffs_mkdir(dir, 0);
+	
+	if ( retval < 0)
+		printf("yaffs_mkdir returning error: %d\n", retval);
+}
+
+void cmd_yaffs_rmdir(const char *dir)
+{
+	checkMount();
+
+	int retval = yaffs_rmdir(dir);
+	
+	if ( retval < 0)
+		printf("yaffs_rmdir returning error: %d\n", retval);
+}
+
+void cmd_yaffs_rm(const char *path)
+{
+	checkMount();
+
+	int retval = yaffs_unlink(path);
+	
+	if ( retval < 0)
+		printf("yaffs_unlink returning error: %d\n", retval);
+}
+
+void cmd_yaffs_mv(const char *oldPath, const char *newPath)
+{
+	checkMount();
+
+	int retval = yaffs_rename(newPath, oldPath);
+	
+	if ( retval < 0)
+		printf("yaffs_unlink returning error: %d\n", retval);
+}

fs/yaffs2/yaffscfg.h

@@ -0,0 +1,46 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * Header file for using yaffs in an application via
+ * a direct interface.
+ */
+
+
+#ifndef __YAFFSCFG_H__
+#define __YAFFSCFG_H__
+
+
+#include "devextras.h"
+
+#define YAFFSFS_N_HANDLES 200
+
+
+typedef struct {
+	const char *prefix;
+	struct yaffs_DeviceStruct *dev;
+} yaffsfs_DeviceConfiguration;
+
+
+void yaffsfs_Lock(void);
+void yaffsfs_Unlock(void);
+
+__u32 yaffsfs_CurrentTime(void);
+
+void yaffsfs_SetError(int err);
+int yaffsfs_GetError(void);
+
+#endif
+

fs/yaffs2/yaffsfs.c

@@ -0,0 +1,1510 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+ 
+/* XXX U-BOOT XXX */
+#include <common.h>
+#include <malloc.h>
+
+#include "yaffsfs.h"
+#include "yaffs_guts.h"
+#include "yaffscfg.h"
+#include "yportenv.h"
+
+/* XXX U-BOOT XXX */
+#if 0
+#include <string.h> // for memset
+#endif
+
+#define YAFFSFS_MAX_SYMLINK_DEREFERENCES 5
+
+#ifndef NULL
+#define NULL ((void *)0)
+#endif
+
+
+const char *yaffsfs_c_version="$Id: yaffsfs.c,v 1.18 2007/07/18 19:40:38 charles Exp $";
+
+// configurationList is the list of devices that are supported
+static yaffsfs_DeviceConfiguration *yaffsfs_configurationList;
+
+
+/* Some forward references */
+static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const char *path, int symDepth);
+static void yaffsfs_RemoveObjectCallback(yaffs_Object *obj);
+
+
+// Handle management.
+// 
+
+
+unsigned int yaffs_wr_attempts;
+
+typedef struct
+{
+	__u8  inUse:1;		// this handle is in use
+	__u8  readOnly:1;	// this handle is read only
+	__u8  append:1;		// append only
+	__u8  exclusive:1;	// exclusive
+	__u32 position;		// current position in file
+	yaffs_Object *obj;	// the object
+}yaffsfs_Handle;
+
+
+static yaffsfs_Handle yaffsfs_handle[YAFFSFS_N_HANDLES];
+
+// yaffsfs_InitHandle
+/// Inilitalise handles on start-up.
+//
+static int yaffsfs_InitHandles(void)
+{
+	int i;
+	for(i = 0; i < YAFFSFS_N_HANDLES; i++)
+	{
+		yaffsfs_handle[i].inUse = 0;
+		yaffsfs_handle[i].obj = NULL;
+	}
+	return 0;
+}
+
+yaffsfs_Handle *yaffsfs_GetHandlePointer(int h)
+{
+	if(h < 0 || h >= YAFFSFS_N_HANDLES)
+	{
+		return NULL;
+	}
+	
+	return &yaffsfs_handle[h];
+}
+
+yaffs_Object *yaffsfs_GetHandleObject(int handle)
+{
+	yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
+
+	if(h && h->inUse)
+	{
+		return h->obj;
+	}
+	
+	return NULL;
+}
+
+
+//yaffsfs_GetHandle
+// Grab a handle (when opening a file)
+//
+
+static int yaffsfs_GetHandle(void)
+{
+	int i;
+	yaffsfs_Handle *h;
+	
+	for(i = 0; i < YAFFSFS_N_HANDLES; i++)
+	{
+		h = yaffsfs_GetHandlePointer(i);
+		if(!h)
+		{
+			// todo bug: should never happen
+		}
+		if(!h->inUse)
+		{
+			memset(h,0,sizeof(yaffsfs_Handle));
+			h->inUse=1;
+			return i;
+		}
+	}
+	return -1;
+}
+
+// yaffs_PutHandle
+// Let go of a handle (when closing a file)
+//
+static int yaffsfs_PutHandle(int handle)
+{
+	yaffsfs_Handle *h = yaffsfs_GetHandlePointer(handle);
+	
+	if(h)
+	{
+		h->inUse = 0;
+		h->obj = NULL;
+	}
+	return 0;
+}
+
+
+
+// Stuff to search for a directory from a path
+
+
+int yaffsfs_Match(char a, char b)
+{
+	// case sensitive
+	return (a == b);
+}
+
+// yaffsfs_FindDevice
+// yaffsfs_FindRoot
+// Scan the configuration list to find the root.
+// Curveballs: Should match paths that end in '/' too
+// Curveball2 Might have "/x/ and "/x/y". Need to return the longest match
+static yaffs_Device *yaffsfs_FindDevice(const char *path, char **restOfPath)
+{
+	yaffsfs_DeviceConfiguration *cfg = yaffsfs_configurationList;
+	const char *leftOver;
+	const char *p;
+	yaffs_Device *retval = NULL;
+	int thisMatchLength;
+	int longestMatch = -1;
+	
+	// Check all configs, choose the one that:
+	// 1) Actually matches a prefix (ie /a amd /abc will not match
+	// 2) Matches the longest.
+	while(cfg && cfg->prefix && cfg->dev)
+	{
+		leftOver = path;
+		p = cfg->prefix;
+		thisMatchLength = 0;
+		
+		while(*p &&  //unmatched part of prefix 
+		      strcmp(p,"/") && // the rest of the prefix is not / (to catch / at end)
+		      *leftOver && 
+		      yaffsfs_Match(*p,*leftOver))
+		{
+			p++;
+			leftOver++;
+			thisMatchLength++;
+		}
+		if((!*p || strcmp(p,"/") == 0) &&      // end of prefix
+		   (!*leftOver || *leftOver == '/') && // no more in this path name part
+		   (thisMatchLength > longestMatch))
+		{
+			// Matched prefix
+			*restOfPath = (char *)leftOver;
+			retval = cfg->dev;
+			longestMatch = thisMatchLength;
+		}
+		cfg++;
+	}
+	return retval;
+}
+
+static yaffs_Object *yaffsfs_FindRoot(const char *path, char **restOfPath)
+{
+
+	yaffs_Device *dev;
+	
+	dev= yaffsfs_FindDevice(path,restOfPath);
+	if(dev && dev->isMounted)
+	{
+		return dev->rootDir;
+	}
+	return NULL;
+}
+
+static yaffs_Object *yaffsfs_FollowLink(yaffs_Object *obj,int symDepth)
+{
+
+	while(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
+	{
+		char *alias = obj->variant.symLinkVariant.alias;
+						
+		if(*alias == '/')
+		{
+			// Starts with a /, need to scan from root up
+			obj = yaffsfs_FindObject(NULL,alias,symDepth++);
+		}
+		else
+		{
+			// Relative to here, so use the parent of the symlink as a start
+			obj = yaffsfs_FindObject(obj->parent,alias,symDepth++);
+		}
+	}
+	return obj;
+}
+
+
+// yaffsfs_FindDirectory
+// Parse a path to determine the directory and the name within the directory.
+//
+// eg. "/data/xx/ff" --> puts name="ff" and returns the directory "/data/xx"
+static yaffs_Object *yaffsfs_DoFindDirectory(yaffs_Object *startDir,const char *path,char **name,int symDepth)
+{
+	yaffs_Object *dir;
+	char *restOfPath;
+	char str[YAFFS_MAX_NAME_LENGTH+1];
+	int i;
+	
+	if(symDepth > YAFFSFS_MAX_SYMLINK_DEREFERENCES)
+	{
+		return NULL;
+	}
+	
+	if(startDir)
+	{
+		dir = startDir;
+		restOfPath = (char *)path;
+	}
+	else
+	{
+		dir = yaffsfs_FindRoot(path,&restOfPath);
+	}
+	
+	while(dir)
+	{	
+		// parse off /.
+		// curve ball: also throw away surplus '/' 
+		// eg. "/ram/x////ff" gets treated the same as "/ram/x/ff"
+		while(*restOfPath == '/')
+		{
+			restOfPath++; // get rid of '/'
+		}
+		
+		*name = restOfPath;
+		i = 0;
+		
+		while(*restOfPath && *restOfPath != '/')
+		{
+			if (i < YAFFS_MAX_NAME_LENGTH)
+			{
+				str[i] = *restOfPath;
+				str[i+1] = '\0';
+				i++;
+			}
+			restOfPath++;
+		}
+		
+		if(!*restOfPath)
+		{
+			// got to the end of the string
+			return dir;
+		}
+		else
+		{
+			if(strcmp(str,".") == 0)
+			{
+				// Do nothing
+			}
+			else if(strcmp(str,"..") == 0)
+			{
+				dir = dir->parent;
+			}
+			else
+			{
+				dir = yaffs_FindObjectByName(dir,str);
+				
+				while(dir && dir->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
+				{
+				
+					dir = yaffsfs_FollowLink(dir,symDepth);
+		
+				}
+				
+				if(dir && dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+				{
+					dir = NULL;
+				}
+			}
+		}
+	}
+	// directory did not exist.
+	return NULL;
+}
+
+static yaffs_Object *yaffsfs_FindDirectory(yaffs_Object *relativeDirectory,const char *path,char **name,int symDepth)
+{
+	return yaffsfs_DoFindDirectory(relativeDirectory,path,name,symDepth);
+}
+
+// yaffsfs_FindObject turns a path for an existing object into the object
+// 
+static yaffs_Object *yaffsfs_FindObject(yaffs_Object *relativeDirectory, const char *path,int symDepth)
+{
+	yaffs_Object *dir;
+	char *name;
+	
+	dir = yaffsfs_FindDirectory(relativeDirectory,path,&name,symDepth);
+	
+	if(dir && *name)
+	{
+		return yaffs_FindObjectByName(dir,name);
+	}
+	
+	return dir;
+}
+
+
+
+int yaffs_open(const char *path, int oflag, int mode)
+{
+	yaffs_Object *obj = NULL;
+	yaffs_Object *dir = NULL;
+	char *name;
+	int handle = -1;
+	yaffsfs_Handle *h = NULL;
+	int alreadyOpen = 0;
+	int alreadyExclusive = 0;
+	int openDenied = 0;
+	int symDepth = 0;
+	int errorReported = 0;
+	
+	int i;
+	
+	
+	// todo sanity check oflag (eg. can't have O_TRUNC without WRONLY or RDWR
+	
+	
+	yaffsfs_Lock();
+	
+	handle = yaffsfs_GetHandle();
+	
+	if(handle >= 0)
+	{
+
+		h = yaffsfs_GetHandlePointer(handle);
+	
+	
+		// try to find the exisiting object
+		obj = yaffsfs_FindObject(NULL,path,0);
+		
+		if(obj && obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
+		{
+		
+			obj = yaffsfs_FollowLink(obj,symDepth++);
+		}
+
+		if(obj)
+		{
+			// Check if the object is already in use
+			alreadyOpen = alreadyExclusive = 0;
+			
+			for(i = 0; i <= YAFFSFS_N_HANDLES; i++)
+			{
+				
+				if(i != handle &&
+				   yaffsfs_handle[i].inUse &&
+				    obj == yaffsfs_handle[i].obj)
+				 {
+				 	alreadyOpen = 1;
+					if(yaffsfs_handle[i].exclusive)
+					{
+						alreadyExclusive = 1;
+					}
+				 }
+			}
+
+			if(((oflag & O_EXCL) && alreadyOpen) || alreadyExclusive)
+			{
+				openDenied = 1;
+			}
+			
+			// Open should fail if O_CREAT and O_EXCL are specified
+			if((oflag & O_EXCL) && (oflag & O_CREAT))
+			{
+				openDenied = 1;
+				yaffsfs_SetError(-EEXIST);
+				errorReported = 1;
+			}
+			
+			// Check file permissions
+			if( (oflag & (O_RDWR | O_WRONLY)) == 0 &&     // ie O_RDONLY
+			   !(obj->yst_mode & S_IREAD))
+			{
+				openDenied = 1;
+			}
+
+			if( (oflag & O_RDWR) && 
+			   !(obj->yst_mode & S_IREAD))
+			{
+				openDenied = 1;
+			}
+
+			if( (oflag & (O_RDWR | O_WRONLY)) && 
+			   !(obj->yst_mode & S_IWRITE))
+			{
+				openDenied = 1;
+			}
+			
+		}
+		
+		else if((oflag & O_CREAT))
+		{
+			// Let's see if we can create this file
+			dir = yaffsfs_FindDirectory(NULL,path,&name,0);
+			if(dir)
+			{
+				obj = yaffs_MknodFile(dir,name,mode,0,0);	
+			}
+			else
+			{
+				yaffsfs_SetError(-ENOTDIR);
+			}
+		}
+		
+		if(obj && !openDenied)
+		{
+			h->obj = obj;
+			h->inUse = 1;
+	    	h->readOnly = (oflag & (O_WRONLY | O_RDWR)) ? 0 : 1;
+			h->append =  (oflag & O_APPEND) ? 1 : 0;
+			h->exclusive = (oflag & O_EXCL) ? 1 : 0;
+			h->position = 0;
+			
+			obj->inUse++;
+			if((oflag & O_TRUNC) && !h->readOnly)
+			{
+				//todo truncate
+				yaffs_ResizeFile(obj,0);
+			}
+			
+		}
+		else
+		{
+			yaffsfs_PutHandle(handle);
+			if(!errorReported)
+			{
+				yaffsfs_SetError(-EACCESS);
+				errorReported = 1;
+			}
+			handle = -1;
+		}
+		
+	}
+	
+	yaffsfs_Unlock();
+	
+	return handle;		
+}
+
+int yaffs_close(int fd)
+{
+	yaffsfs_Handle *h = NULL;
+	int retVal = 0;
+	
+	yaffsfs_Lock();
+
+	h = yaffsfs_GetHandlePointer(fd);
+	
+	if(h && h->inUse)
+	{
+		// clean up
+		yaffs_FlushFile(h->obj,1);
+		h->obj->inUse--;
+		if(h->obj->inUse <= 0 && h->obj->unlinked)
+		{
+			yaffs_DeleteFile(h->obj);
+		}
+		yaffsfs_PutHandle(fd);
+		retVal = 0;
+	}
+	else
+	{
+		// bad handle
+		yaffsfs_SetError(-EBADF);		
+		retVal = -1;
+	}
+	
+	yaffsfs_Unlock();
+	
+	return retVal;
+}
+
+int yaffs_read(int fd, void *buf, unsigned int nbyte)
+{
+	yaffsfs_Handle *h = NULL;
+	yaffs_Object *obj = NULL;
+	int pos = 0;
+	int nRead = -1;
+	int maxRead;
+	
+	yaffsfs_Lock();
+	h = yaffsfs_GetHandlePointer(fd);
+	obj = yaffsfs_GetHandleObject(fd);
+	
+	if(!h || !obj)
+	{
+		// bad handle
+		yaffsfs_SetError(-EBADF);		
+	}
+	else if( h && obj)
+	{
+		pos=  h->position;
+		if(yaffs_GetObjectFileLength(obj) > pos)
+		{
+			maxRead = yaffs_GetObjectFileLength(obj) - pos;
+		}
+		else
+		{
+			maxRead = 0;
+		}
+
+		if(nbyte > maxRead)
+		{
+			nbyte = maxRead;
+		}
+
+		
+		if(nbyte > 0)
+		{
+			nRead = yaffs_ReadDataFromFile(obj,buf,pos,nbyte);
+			if(nRead >= 0)
+			{
+				h->position = pos + nRead;
+			}
+			else
+			{
+				//todo error
+			}
+		}
+		else
+		{
+			nRead = 0;
+		}
+		
+	}
+	
+	yaffsfs_Unlock();
+	
+	
+	return (nRead >= 0) ? nRead : -1;
+		
+}
+
+int yaffs_write(int fd, const void *buf, unsigned int nbyte)
+{
+	yaffsfs_Handle *h = NULL;
+	yaffs_Object *obj = NULL;
+	int pos = 0;
+	int nWritten = -1;
+	int writeThrough = 0;
+	
+	yaffsfs_Lock();
+	h = yaffsfs_GetHandlePointer(fd);
+	obj = yaffsfs_GetHandleObject(fd);
+	
+	if(!h || !obj)
+	{
+		// bad handle
+		yaffsfs_SetError(-EBADF);		
+	}
+	else if( h && obj && h->readOnly)
+	{
+		// todo error
+	}
+	else if( h && obj)
+	{
+		if(h->append)
+		{
+			pos =  yaffs_GetObjectFileLength(obj);
+		}
+		else
+		{
+			pos = h->position;
+		}
+		
+		nWritten = yaffs_WriteDataToFile(obj,buf,pos,nbyte,writeThrough);
+		
+		if(nWritten >= 0)
+		{
+			h->position = pos + nWritten;
+		}
+		else
+		{
+			//todo error
+		}
+		
+	}
+	
+	yaffsfs_Unlock();
+	
+	
+	return (nWritten >= 0) ? nWritten : -1;
+
+}
+
+int yaffs_truncate(int fd, off_t newSize)
+{
+	yaffsfs_Handle *h = NULL;
+	yaffs_Object *obj = NULL;
+	int result = 0;
+	
+	yaffsfs_Lock();
+	h = yaffsfs_GetHandlePointer(fd);
+	obj = yaffsfs_GetHandleObject(fd);
+	
+	if(!h || !obj)
+	{
+		// bad handle
+		yaffsfs_SetError(-EBADF);		
+	}
+	else
+	{
+		// resize the file
+		result = yaffs_ResizeFile(obj,newSize);
+	}	
+	yaffsfs_Unlock();
+	
+	
+	return (result) ? 0 : -1;
+
+}
+
+off_t yaffs_lseek(int fd, off_t offset, int whence) 
+{
+	yaffsfs_Handle *h = NULL;
+	yaffs_Object *obj = NULL;
+	int pos = -1;
+	int fSize = -1;
+	
+	yaffsfs_Lock();
+	h = yaffsfs_GetHandlePointer(fd);
+	obj = yaffsfs_GetHandleObject(fd);
+	
+	if(!h || !obj)
+	{
+		// bad handle
+		yaffsfs_SetError(-EBADF);		
+	}
+	else if(whence == SEEK_SET)
+	{
+		if(offset >= 0)
+		{
+			pos = offset;
+		}
+	}
+	else if(whence == SEEK_CUR)
+	{
+		if( (h->position + offset) >= 0)
+		{
+			pos = (h->position + offset);
+		}
+	}
+	else if(whence == SEEK_END)
+	{
+		fSize = yaffs_GetObjectFileLength(obj);
+		if(fSize >= 0 && (fSize + offset) >= 0)
+		{
+			pos = fSize + offset;
+		}
+	}
+	
+	if(pos >= 0)
+	{
+		h->position = pos;
+	}
+	else
+	{
+		// todo error
+	}
+
+	
+	yaffsfs_Unlock();
+	
+	return pos;
+}
+
+
+int yaffsfs_DoUnlink(const char *path,int isDirectory) 
+{
+	yaffs_Object *dir = NULL;
+	yaffs_Object *obj = NULL;
+	char *name;
+	int result = YAFFS_FAIL;
+	
+	yaffsfs_Lock();
+
+	obj = yaffsfs_FindObject(NULL,path,0);
+	dir = yaffsfs_FindDirectory(NULL,path,&name,0);
+	if(!dir)
+	{
+		yaffsfs_SetError(-ENOTDIR);
+	}
+	else if(!obj)
+	{
+		yaffsfs_SetError(-ENOENT);
+	}
+	else if(!isDirectory && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
+	{
+		yaffsfs_SetError(-EISDIR);
+	}
+	else if(isDirectory && obj->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+	{
+		yaffsfs_SetError(-ENOTDIR);
+	}
+	else
+	{
+		result = yaffs_Unlink(dir,name);
+		
+		if(result == YAFFS_FAIL && isDirectory)
+		{
+			yaffsfs_SetError(-ENOTEMPTY);
+		}
+	}
+	
+	yaffsfs_Unlock();
+	
+	// todo error
+	
+	return (result == YAFFS_FAIL) ? -1 : 0;
+}
+int yaffs_rmdir(const char *path) 
+{
+	return yaffsfs_DoUnlink(path,1);
+}
+
+int yaffs_unlink(const char *path) 
+{
+	return yaffsfs_DoUnlink(path,0);
+}
+
+int yaffs_rename(const char *oldPath, const char *newPath)
+{
+	yaffs_Object *olddir = NULL;
+	yaffs_Object *newdir = NULL;
+	yaffs_Object *obj = NULL;
+	char *oldname;
+	char *newname;
+	int result= YAFFS_FAIL;
+	int renameAllowed = 1;
+	
+	yaffsfs_Lock();
+	
+	olddir = yaffsfs_FindDirectory(NULL,oldPath,&oldname,0);
+	newdir = yaffsfs_FindDirectory(NULL,newPath,&newname,0);
+	obj = yaffsfs_FindObject(NULL,oldPath,0);
+	
+	if(!olddir || !newdir || !obj)
+	{
+		// bad file
+		yaffsfs_SetError(-EBADF);	
+		renameAllowed = 0;	
+	}
+	else if(olddir->myDev != newdir->myDev)
+	{
+		// oops must be on same device
+		// todo error
+		yaffsfs_SetError(-EXDEV);
+		renameAllowed = 0;	
+	}
+	else if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
+	{
+		// It is a directory, check that it is not being renamed to 
+		// being its own decendent.
+		// Do this by tracing from the new directory back to the root, checking for obj
+		
+		yaffs_Object *xx = newdir;
+		
+		while( renameAllowed && xx)
+		{
+			if(xx == obj)
+			{
+				renameAllowed = 0;
+			}
+			xx = xx->parent;
+		}
+		if(!renameAllowed) yaffsfs_SetError(-EACCESS);
+	}
+	
+	if(renameAllowed)
+	{
+		result = yaffs_RenameObject(olddir,oldname,newdir,newname);
+	}
+	
+	yaffsfs_Unlock();
+	
+	return (result == YAFFS_FAIL) ? -1 : 0;	
+}
+
+
+static int yaffsfs_DoStat(yaffs_Object *obj,struct yaffs_stat *buf)
+{
+	int retVal = -1;
+
+	if(obj)
+	{
+		obj = yaffs_GetEquivalentObject(obj);
+	}
+
+	if(obj && buf)
+	{
+    	buf->st_dev = (int)obj->myDev->genericDevice;
+    	buf->st_ino = obj->objectId;
+    	buf->st_mode = obj->yst_mode & ~S_IFMT; // clear out file type bits
+	
+		if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) 
+		{
+			buf->st_mode |= S_IFDIR;
+		}
+		else if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) 
+		{
+			buf->st_mode |= S_IFLNK;
+		}
+		else if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
+		{
+			buf->st_mode |= S_IFREG;
+		}
+		
+    	buf->st_nlink = yaffs_GetObjectLinkCount(obj);
+    	buf->st_uid = 0;    
+    	buf->st_gid = 0;;     
+    	buf->st_rdev = obj->yst_rdev;
+    	buf->st_size = yaffs_GetObjectFileLength(obj);
+		buf->st_blksize = obj->myDev->nDataBytesPerChunk;
+    	buf->st_blocks = (buf->st_size + buf->st_blksize -1)/buf->st_blksize;
+    	buf->yst_atime = obj->yst_atime; 
+    	buf->yst_ctime = obj->yst_ctime; 
+    	buf->yst_mtime = obj->yst_mtime; 
+		retVal = 0;
+	}
+	return retVal;
+}
+
+static int yaffsfs_DoStatOrLStat(const char *path, struct yaffs_stat *buf,int doLStat)
+{
+	yaffs_Object *obj;
+	
+	int retVal = -1;
+	
+	yaffsfs_Lock();
+	obj = yaffsfs_FindObject(NULL,path,0);
+	
+	if(!doLStat && obj)
+	{
+		obj = yaffsfs_FollowLink(obj,0);
+	}
+	
+	if(obj)
+	{
+		retVal = yaffsfs_DoStat(obj,buf);
+	}
+	else
+	{
+		// todo error not found
+		yaffsfs_SetError(-ENOENT);
+	}
+	
+	yaffsfs_Unlock();
+	
+	return retVal;
+	
+}
+
+int yaffs_stat(const char *path, struct yaffs_stat *buf)
+{
+	return yaffsfs_DoStatOrLStat(path,buf,0);
+}
+
+int yaffs_lstat(const char *path, struct yaffs_stat *buf)
+{
+	return yaffsfs_DoStatOrLStat(path,buf,1);
+}
+
+int yaffs_fstat(int fd, struct yaffs_stat *buf)
+{
+	yaffs_Object *obj;
+	
+	int retVal = -1;
+	
+	yaffsfs_Lock();
+	obj = yaffsfs_GetHandleObject(fd);
+	
+	if(obj)
+	{
+		retVal = yaffsfs_DoStat(obj,buf);
+	}
+	else
+	{
+		// bad handle
+		yaffsfs_SetError(-EBADF);		
+	}
+	
+	yaffsfs_Unlock();
+	
+	return retVal;
+}
+
+static int yaffsfs_DoChMod(yaffs_Object *obj,mode_t mode)
+{
+	int result = YAFFS_FAIL;
+
+	if(obj)
+	{
+		obj = yaffs_GetEquivalentObject(obj);
+	}
+	
+	if(obj)
+	{
+		obj->yst_mode = mode;
+		obj->dirty = 1;
+		result = yaffs_FlushFile(obj,0);
+	}
+	
+	return result == YAFFS_OK ? 0 : -1;
+}
+
+
+int yaffs_chmod(const char *path, mode_t mode)
+{
+	yaffs_Object *obj;
+	
+	int retVal = -1;
+	
+	yaffsfs_Lock();
+	obj = yaffsfs_FindObject(NULL,path,0);
+	
+	if(obj)
+	{
+		retVal = yaffsfs_DoChMod(obj,mode);
+	}
+	else
+	{
+		// todo error not found
+		yaffsfs_SetError(-ENOENT);
+	}
+	
+	yaffsfs_Unlock();
+	
+	return retVal;
+	
+}
+
+
+int yaffs_fchmod(int fd, mode_t mode)
+{
+	yaffs_Object *obj;
+	
+	int retVal = -1;
+	
+	yaffsfs_Lock();
+	obj = yaffsfs_GetHandleObject(fd);
+	
+	if(obj)
+	{
+		retVal = yaffsfs_DoChMod(obj,mode);
+	}
+	else
+	{
+		// bad handle
+		yaffsfs_SetError(-EBADF);		
+	}
+	
+	yaffsfs_Unlock();
+	
+	return retVal;
+}
+
+
+int yaffs_mkdir(const char *path, mode_t mode)
+{
+	yaffs_Object *parent = NULL;
+	yaffs_Object *dir = NULL;
+	char *name;
+	int retVal= -1;
+	
+	yaffsfs_Lock();
+	parent = yaffsfs_FindDirectory(NULL,path,&name,0);
+	if(parent)
+		dir = yaffs_MknodDirectory(parent,name,mode,0,0);
+	if(dir)
+	{
+		retVal = 0;
+	}
+	else
+	{
+		yaffsfs_SetError(-ENOSPC); // just assume no space for now
+		retVal = -1;
+	}
+	
+	yaffsfs_Unlock();
+	
+	return retVal;
+}
+
+int yaffs_mount(const char *path)
+{
+	int retVal=-1;
+	int result=YAFFS_FAIL;
+	yaffs_Device *dev=NULL;
+	char *dummy;
+	
+	T(YAFFS_TRACE_ALWAYS,("yaffs: Mounting %s\n",path));
+	
+	yaffsfs_Lock();
+	dev = yaffsfs_FindDevice(path,&dummy);
+	if(dev)
+	{
+		if(!dev->isMounted)
+		{
+			result = yaffs_GutsInitialise(dev);
+			if(result == YAFFS_FAIL)
+			{
+				// todo error - mount failed
+				yaffsfs_SetError(-ENOMEM);
+			}
+			retVal = result ? 0 : -1;
+			
+		}
+		else
+		{
+			//todo error - already mounted.
+			yaffsfs_SetError(-EBUSY);
+		}
+	}
+	else
+	{
+		// todo error - no device
+		yaffsfs_SetError(-ENODEV);
+	}
+	yaffsfs_Unlock();
+	return retVal;
+	
+}
+
+int yaffs_unmount(const char *path)
+{
+	int retVal=-1;
+	yaffs_Device *dev=NULL;
+	char *dummy;
+	
+	yaffsfs_Lock();
+	dev = yaffsfs_FindDevice(path,&dummy);
+	if(dev)
+	{
+		if(dev->isMounted)
+		{
+			int i;
+			int inUse;
+			
+			yaffs_FlushEntireDeviceCache(dev);
+			yaffs_CheckpointSave(dev);
+			
+			for(i = inUse = 0; i < YAFFSFS_N_HANDLES && !inUse; i++)
+			{
+				if(yaffsfs_handle[i].inUse && yaffsfs_handle[i].obj->myDev == dev)
+				{
+					inUse = 1; // the device is in use, can't unmount
+				}
+			}
+			
+			if(!inUse)
+			{
+				yaffs_Deinitialise(dev);
+					
+				retVal = 0;
+			}
+			else
+			{
+				// todo error can't unmount as files are open
+				yaffsfs_SetError(-EBUSY);
+			}
+			
+		}
+		else
+		{
+			//todo error - not mounted.
+			yaffsfs_SetError(-EINVAL);
+			
+		}
+	}
+	else
+	{
+		// todo error - no device
+		yaffsfs_SetError(-ENODEV);
+	}	
+	yaffsfs_Unlock();
+	return retVal;
+	
+}
+
+loff_t yaffs_freespace(const char *path)
+{
+	loff_t retVal=-1;
+	yaffs_Device *dev=NULL;
+	char *dummy;
+	
+	yaffsfs_Lock();
+	dev = yaffsfs_FindDevice(path,&dummy);
+	if(dev  && dev->isMounted)
+	{
+		retVal = yaffs_GetNumberOfFreeChunks(dev);
+		retVal *= dev->nDataBytesPerChunk;
+		
+	}
+	else
+	{
+		yaffsfs_SetError(-EINVAL);
+	}
+	
+	yaffsfs_Unlock();
+	return retVal;	
+}
+
+
+
+void yaffs_initialise(yaffsfs_DeviceConfiguration *cfgList)
+{
+	
+	yaffsfs_DeviceConfiguration *cfg;
+	
+	yaffsfs_configurationList = cfgList;
+	
+	yaffsfs_InitHandles();
+	
+	cfg = yaffsfs_configurationList;
+	
+	while(cfg && cfg->prefix && cfg->dev)
+	{
+		cfg->dev->isMounted = 0;
+		cfg->dev->removeObjectCallback = yaffsfs_RemoveObjectCallback;
+		cfg++;
+	}
+}
+
+
+//
+// Directory search stuff.
+
+//
+// Directory search context
+//
+// NB this is an opaque structure.
+
+
+typedef struct
+{
+	__u32 magic;
+	yaffs_dirent de;		/* directory entry being used by this dsc */
+	char name[NAME_MAX+1];		/* name of directory being searched */
+	yaffs_Object *dirObj;		/* ptr to directory being searched */
+	yaffs_Object *nextReturn;	/* obj to be returned by next readddir */
+	int offset;
+	struct list_head others;	
+} yaffsfs_DirectorySearchContext;
+
+
+
+static struct list_head search_contexts;
+
+
+static void yaffsfs_SetDirRewound(yaffsfs_DirectorySearchContext *dsc)
+{
+	if(dsc &&
+	   dsc->dirObj &&
+	   dsc->dirObj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){
+	   
+	   dsc->offset = 0;
+	   
+	   if( list_empty(&dsc->dirObj->variant.directoryVariant.children)){
+	   	dsc->nextReturn = NULL;
+	   } else {
+	      	dsc->nextReturn = list_entry(dsc->dirObj->variant.directoryVariant.children.next,
+						yaffs_Object,siblings);
+	   }
+	} else {
+		/* Hey someone isn't playing nice! */
+	}
+}
+
+static void yaffsfs_DirAdvance(yaffsfs_DirectorySearchContext *dsc)
+{
+	if(dsc &&
+	   dsc->dirObj &&
+	   dsc->dirObj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY){
+	   
+	   if( dsc->nextReturn == NULL ||
+	       list_empty(&dsc->dirObj->variant.directoryVariant.children)){
+	   	dsc->nextReturn = NULL;
+	   } else {
+		   struct list_head *next = dsc->nextReturn->siblings.next;
+   
+		   if( next == &dsc->dirObj->variant.directoryVariant.children)
+	   		dsc->nextReturn = NULL; /* end of list */
+	   	   else 
+		   	dsc->nextReturn = list_entry(next,yaffs_Object,siblings);
+	   }
+	} else {
+		/* Hey someone isn't playing nice! */
+	}
+}
+
+static void yaffsfs_RemoveObjectCallback(yaffs_Object *obj)
+{
+
+	struct list_head *i;
+	yaffsfs_DirectorySearchContext *dsc;
+	
+	/* if search contexts not initilised then skip */
+	if(!search_contexts.next)
+		return;
+		
+	/* Iteratethrough the directory search contexts.
+	 * If any are the one being removed, then advance the dsc to
+	 * the next one to prevent a hanging ptr.
+	 */
+	 list_for_each(i, &search_contexts) {
+		if (i) {
+			dsc = list_entry(i, yaffsfs_DirectorySearchContext,others);
+			if(dsc->nextReturn == obj)
+				yaffsfs_DirAdvance(dsc);
+		}
+	}
+				
+}
+
+yaffs_DIR *yaffs_opendir(const char *dirname)
+{
+	yaffs_DIR *dir = NULL;
+ 	yaffs_Object *obj = NULL;
+	yaffsfs_DirectorySearchContext *dsc = NULL;
+	
+	yaffsfs_Lock();
+	
+	obj = yaffsfs_FindObject(NULL,dirname,0);
+	
+	if(obj && obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
+	{
+		
+		dsc = YMALLOC(sizeof(yaffsfs_DirectorySearchContext));
+		dir = (yaffs_DIR *)dsc;
+		if(dsc)
+		{
+			memset(dsc,0,sizeof(yaffsfs_DirectorySearchContext));
+			dsc->magic = YAFFS_MAGIC;
+			dsc->dirObj = obj;
+			strncpy(dsc->name,dirname,NAME_MAX);
+			INIT_LIST_HEAD(&dsc->others);
+			
+			if(!search_contexts.next)
+				INIT_LIST_HEAD(&search_contexts);
+				
+			list_add(&dsc->others,&search_contexts);	
+			yaffsfs_SetDirRewound(dsc);		}
+	
+	}
+	
+	yaffsfs_Unlock();
+	
+	return dir;
+}
+
+struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp)
+{
+	yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
+	struct yaffs_dirent *retVal = NULL;
+		
+	yaffsfs_Lock();
+	
+	if(dsc && dsc->magic == YAFFS_MAGIC){
+		yaffsfs_SetError(0);
+		if(dsc->nextReturn){
+			dsc->de.d_ino = yaffs_GetEquivalentObject(dsc->nextReturn)->objectId;
+			dsc->de.d_dont_use = (unsigned)dsc->nextReturn;
+			dsc->de.d_off = dsc->offset++;
+			yaffs_GetObjectName(dsc->nextReturn,dsc->de.d_name,NAME_MAX);
+			if(strlen(dsc->de.d_name) == 0)
+			{
+				// this should not happen!
+				strcpy(dsc->de.d_name,"zz");
+			}
+			dsc->de.d_reclen = sizeof(struct yaffs_dirent);
+			retVal = &dsc->de;
+			yaffsfs_DirAdvance(dsc);
+		} else
+			retVal = NULL;
+	}
+	else
+	{
+		yaffsfs_SetError(-EBADF);
+	}
+	
+	yaffsfs_Unlock();
+	
+	return retVal;
+	
+}
+
+
+void yaffs_rewinddir(yaffs_DIR *dirp)
+{
+	yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
+	
+	yaffsfs_Lock();
+	
+	yaffsfs_SetDirRewound(dsc);
+
+	yaffsfs_Unlock();
+}
+
+
+int yaffs_closedir(yaffs_DIR *dirp)
+{
+	yaffsfs_DirectorySearchContext *dsc = (yaffsfs_DirectorySearchContext *)dirp;
+		
+	yaffsfs_Lock();
+	dsc->magic = 0;
+	list_del(&dsc->others); /* unhook from list */
+	YFREE(dsc);
+	yaffsfs_Unlock();
+	return 0;
+}
+
+// end of directory stuff
+
+
+int yaffs_symlink(const char *oldpath, const char *newpath)
+{
+	yaffs_Object *parent = NULL;
+	yaffs_Object *obj;
+	char *name;
+	int retVal= -1;
+	int mode = 0; // ignore for now
+	
+	yaffsfs_Lock();
+	parent = yaffsfs_FindDirectory(NULL,newpath,&name,0);
+	obj = yaffs_MknodSymLink(parent,name,mode,0,0,oldpath);
+	if(obj)
+	{
+		retVal = 0;
+	}
+	else
+	{
+		yaffsfs_SetError(-ENOSPC); // just assume no space for now
+		retVal = -1;
+	}
+	
+	yaffsfs_Unlock();
+	
+	return retVal;
+	
+}
+
+int yaffs_readlink(const char *path, char *buf, int bufsiz)
+{
+	yaffs_Object *obj = NULL;
+	int retVal;
+
+		
+	yaffsfs_Lock();
+	
+	obj = yaffsfs_FindObject(NULL,path,0);
+	
+	if(!obj)
+	{
+		yaffsfs_SetError(-ENOENT);
+		retVal = -1;
+	}
+	else if(obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK)
+	{
+		yaffsfs_SetError(-EINVAL);
+		retVal = -1;
+	}
+	else
+	{
+		char *alias = obj->variant.symLinkVariant.alias;
+		memset(buf,0,bufsiz);
+		strncpy(buf,alias,bufsiz - 1);
+		retVal = 0;
+	}
+	yaffsfs_Unlock();
+	return retVal;
+}
+
+int yaffs_link(const char *oldpath, const char *newpath)
+{
+	// Creates a link called newpath to existing oldpath
+	yaffs_Object *obj = NULL;
+	yaffs_Object *target = NULL;
+	int retVal = 0;
+
+		
+	yaffsfs_Lock();
+	
+	obj = yaffsfs_FindObject(NULL,oldpath,0);
+	target = yaffsfs_FindObject(NULL,newpath,0);
+	
+	if(!obj)
+	{
+		yaffsfs_SetError(-ENOENT);
+		retVal = -1;
+	}
+	else if(target)
+	{
+		yaffsfs_SetError(-EEXIST);
+		retVal = -1;
+	}
+	else	
+	{
+		yaffs_Object *newdir = NULL;
+		yaffs_Object *link = NULL;
+		
+		char *newname;
+		
+		newdir = yaffsfs_FindDirectory(NULL,newpath,&newname,0);
+		
+		if(!newdir)
+		{
+			yaffsfs_SetError(-ENOTDIR);
+			retVal = -1;
+		}
+		else if(newdir->myDev != obj->myDev)
+		{
+			yaffsfs_SetError(-EXDEV);
+			retVal = -1;
+		}
+		if(newdir && strlen(newname) > 0)
+		{
+			link = yaffs_Link(newdir,newname,obj);
+			if(link)
+				retVal = 0;
+			else
+			{
+				yaffsfs_SetError(-ENOSPC);
+				retVal = -1;
+			}
+
+		}
+	}
+	yaffsfs_Unlock();
+	
+	return retVal;
+}
+
+int yaffs_mknod(const char *pathname, mode_t mode, dev_t dev);
+
+int yaffs_DumpDevStruct(const char *path)
+{
+	char *rest;
+	
+	yaffs_Object *obj = yaffsfs_FindRoot(path,&rest);
+	
+	if(obj)
+	{
+		yaffs_Device *dev = obj->myDev;
+		
+		printf("\n"
+			   "nPageWrites.......... %d\n"
+			   "nPageReads........... %d\n"
+			   "nBlockErasures....... %d\n"
+			   "nGCCopies............ %d\n"
+			   "garbageCollections... %d\n"
+			   "passiveGarbageColl'ns %d\n"
+			   "\n",
+				dev->nPageWrites,
+				dev->nPageReads,
+				dev->nBlockErasures,
+				dev->nGCCopies,
+				dev->garbageCollections,
+				dev->passiveGarbageCollections
+		);
+		
+	}
+	return 0;
+}

fs/yaffs2/yaffsfs.h

@@ -0,0 +1,233 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * Header file for using yaffs in an application via
+ * a direct interface.
+ */
+
+
+#ifndef __YAFFSFS_H__
+#define __YAFFSFS_H__
+
+#include "yaffscfg.h"
+#include "yportenv.h"
+
+
+//typedef long off_t;
+//typedef long dev_t;
+//typedef unsigned long mode_t;
+
+
+#ifndef NAME_MAX
+#define NAME_MAX	256
+#endif
+
+#ifndef O_RDONLY
+#define O_RDONLY	00
+#endif
+
+#ifndef O_WRONLY
+#define O_WRONLY	01
+#endif
+
+#ifndef O_RDWR
+#define O_RDWR		02
+#endif
+
+#ifndef O_CREAT		
+#define O_CREAT 	0100
+#endif
+
+#ifndef O_EXCL
+#define O_EXCL		0200
+#endif
+
+#ifndef O_TRUNC
+#define O_TRUNC		01000
+#endif
+
+#ifndef O_APPEND
+#define O_APPEND	02000
+#endif
+
+#ifndef SEEK_SET
+#define SEEK_SET	0
+#endif
+
+#ifndef SEEK_CUR
+#define SEEK_CUR	1
+#endif
+
+#ifndef SEEK_END
+#define SEEK_END	2
+#endif
+
+#ifndef EBUSY
+#define EBUSY	16
+#endif
+
+#ifndef ENODEV
+#define ENODEV	19
+#endif
+
+#ifndef EINVAL
+#define EINVAL	22
+#endif
+
+#ifndef EBADF
+#define EBADF	9
+#endif
+
+#ifndef EACCESS
+#define EACCESS	13
+#endif
+
+#ifndef EXDEV	
+#define EXDEV	18
+#endif
+
+#ifndef ENOENT
+#define ENOENT	2
+#endif
+
+#ifndef ENOSPC
+#define ENOSPC	28
+#endif
+
+#ifndef ENOTEMPTY
+#define ENOTEMPTY 39
+#endif
+
+#ifndef ENOMEM
+#define ENOMEM 12
+#endif
+
+#ifndef EEXIST
+#define EEXIST 17
+#endif
+
+#ifndef ENOTDIR
+#define ENOTDIR 20
+#endif
+
+#ifndef EISDIR
+#define EISDIR 21
+#endif
+
+
+// Mode flags
+
+#ifndef S_IFMT
+#define S_IFMT		0170000
+#endif
+
+#ifndef S_IFLNK
+#define S_IFLNK		0120000
+#endif
+
+#ifndef S_IFDIR
+#define S_IFDIR		0040000
+#endif
+
+#ifndef S_IFREG
+#define S_IFREG		0100000
+#endif
+
+#ifndef S_IREAD 
+#define S_IREAD		0000400
+#endif
+
+#ifndef S_IWRITE
+#define	S_IWRITE	0000200
+#endif
+
+
+
+
+struct yaffs_dirent{
+    long d_ino;                 /* inode number */
+    off_t d_off;                /* offset to this dirent */
+    unsigned short d_reclen;    /* length of this d_name */
+    char d_name [NAME_MAX+1];   /* file name (null-terminated) */
+    unsigned d_dont_use;	/* debug pointer, not for public consumption */
+};
+
+typedef struct yaffs_dirent yaffs_dirent;
+
+
+typedef struct __opaque yaffs_DIR;
+
+
+
+struct yaffs_stat{
+    int		      st_dev;      /* device */
+    int           st_ino;      /* inode */
+    mode_t        st_mode;     /* protection */
+    int           st_nlink;    /* number of hard links */
+    int           st_uid;      /* user ID of owner */
+    int           st_gid;      /* group ID of owner */
+    unsigned      st_rdev;     /* device type (if inode device) */
+    off_t         st_size;     /* total size, in bytes */
+    unsigned long st_blksize;  /* blocksize for filesystem I/O */
+    unsigned long st_blocks;   /* number of blocks allocated */
+    unsigned long yst_atime;    /* time of last access */
+    unsigned long yst_mtime;    /* time of last modification */
+    unsigned long yst_ctime;    /* time of last change */
+};
+
+int yaffs_open(const char *path, int oflag, int mode) ;
+int yaffs_read(int fd, void *buf, unsigned int nbyte) ;
+int yaffs_write(int fd, const void *buf, unsigned int nbyte) ;
+int yaffs_close(int fd) ;
+off_t yaffs_lseek(int fd, off_t offset, int whence) ;
+int yaffs_truncate(int fd, off_t newSize);
+
+int yaffs_unlink(const char *path) ;
+int yaffs_rename(const char *oldPath, const char *newPath) ;
+
+int yaffs_stat(const char *path, struct yaffs_stat *buf) ;
+int yaffs_lstat(const char *path, struct yaffs_stat *buf) ;
+int yaffs_fstat(int fd, struct yaffs_stat *buf) ;
+
+int yaffs_chmod(const char *path, mode_t mode); 
+int yaffs_fchmod(int fd, mode_t mode); 
+
+int yaffs_mkdir(const char *path, mode_t mode) ;
+int yaffs_rmdir(const char *path) ;
+
+yaffs_DIR *yaffs_opendir(const char *dirname) ;
+struct yaffs_dirent *yaffs_readdir(yaffs_DIR *dirp) ;
+void yaffs_rewinddir(yaffs_DIR *dirp) ;
+int yaffs_closedir(yaffs_DIR *dirp) ;
+
+int yaffs_mount(const char *path) ;
+int yaffs_unmount(const char *path) ;
+
+int yaffs_symlink(const char *oldpath, const char *newpath); 
+int yaffs_readlink(const char *path, char *buf, int bufsiz); 
+
+int yaffs_link(const char *oldpath, const char *newpath); 
+int yaffs_mknod(const char *pathname, mode_t mode, dev_t dev);
+
+loff_t yaffs_freespace(const char *path);
+
+void yaffs_initialise(yaffsfs_DeviceConfiguration *configList);
+
+int yaffs_StartUp(void);
+
+#endif
+
+

fs/yaffs2/yaffsinterface.h

@@ -0,0 +1,21 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFSINTERFACE_H__
+#define __YAFFSINTERFACE_H__
+
+int yaffs_Initialise(unsigned nBlocks);
+
+#endif

fs/yaffs2/ydirectenv.h

@@ -0,0 +1,94 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * ydirectenv.h: Environment wrappers for YAFFS direct.
+ */
+
+#ifndef __YDIRECTENV_H__
+#define __YDIRECTENV_H__
+
+// Direct interface
+
+#include "devextras.h"
+
+/* XXX U-BOOT XXX */
+#if 0
+#include "stdlib.h"
+#include "stdio.h"
+#include "string.h"
+#include "assert.h"
+#endif
+#include "yaffs_malloc.h"
+
+/* XXX U-BOOT XXX */
+#if 0
+#define YBUG() assert(1)
+#endif
+
+#define YCHAR char
+#define YUCHAR unsigned char
+#define _Y(x) x
+#define yaffs_strcpy(a,b)    strcpy(a,b)
+#define yaffs_strncpy(a,b,c) strncpy(a,b,c)
+#define yaffs_strncmp(a,b,c) strncmp(a,b,c)
+#define yaffs_strlen(s)	     strlen(s)
+#define yaffs_sprintf	     sprintf
+#define yaffs_toupper(a)     toupper(a)
+
+#ifdef NO_Y_INLINE
+#define Y_INLINE
+#else
+#define Y_INLINE inline
+#endif
+
+#define YMALLOC(x) yaffs_malloc(x)
+#define YFREE(x)   free(x)
+#define YMALLOC_ALT(x) yaffs_malloc(x)
+#define YFREE_ALT(x)   free(x)
+
+#define YMALLOC_DMA(x) yaffs_malloc(x)
+
+#define YYIELD()  do {} while(0)
+
+
+
+//#define YINFO(s) YPRINTF(( __FILE__ " %d %s\n",__LINE__,s))
+//#define YALERT(s) YINFO(s)
+
+
+#define TENDSTR "\n"
+#define TSTR(x) x
+#define TOUT(p) printf p
+
+
+#define YAFFS_LOSTNFOUND_NAME		"lost+found"
+#define YAFFS_LOSTNFOUND_PREFIX		"obj"
+//#define YPRINTF(x) printf x
+
+#include "yaffscfg.h"
+
+#define Y_CURRENT_TIME yaffsfs_CurrentTime()
+#define Y_TIME_CONVERT(x) x
+
+#define YAFFS_ROOT_MODE				0666
+#define YAFFS_LOSTNFOUND_MODE		0666
+
+#define yaffs_SumCompare(x,y) ((x) == (y))
+#define yaffs_strcmp(a,b) strcmp(a,b)
+
+#endif
+
+

fs/yaffs2/yportenv.h

@@ -0,0 +1,193 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system. 
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+
+#ifndef __YPORTENV_H__
+#define __YPORTENV_H__
+
+/* XXX U-BOOT XXX */
+#ifndef CONFIG_YAFFS_DIRECT
+#define CONFIG_YAFFS_DIRECT
+#endif
+
+#if defined CONFIG_YAFFS_WINCE
+
+#include "ywinceenv.h"
+
+/* XXX U-BOOT XXX */
+#elif  0 /* defined __KERNEL__ */
+
+#include "moduleconfig.h"
+
+/* Linux kernel */
+#include <linux/version.h>
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
+#include <linux/config.h>
+#endif
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+
+#define YCHAR char
+#define YUCHAR unsigned char
+#define _Y(x)     x
+#define yaffs_strcpy(a,b)    strcpy(a,b)
+#define yaffs_strncpy(a,b,c) strncpy(a,b,c)
+#define yaffs_strncmp(a,b,c) strncmp(a,b,c)
+#define yaffs_strlen(s)	     strlen(s)
+#define yaffs_sprintf	     sprintf
+#define yaffs_toupper(a)     toupper(a)
+
+#define Y_INLINE inline
+
+#define YAFFS_LOSTNFOUND_NAME		"lost+found"
+#define YAFFS_LOSTNFOUND_PREFIX		"obj"
+
+/* #define YPRINTF(x) printk x */
+#define YMALLOC(x) kmalloc(x,GFP_KERNEL)
+#define YFREE(x)   kfree(x)
+#define YMALLOC_ALT(x) vmalloc(x)
+#define YFREE_ALT(x)   vfree(x)
+#define YMALLOC_DMA(x) YMALLOC(x)
+
+// KR - added for use in scan so processes aren't blocked indefinitely.
+#define YYIELD() schedule()
+
+#define YAFFS_ROOT_MODE			0666
+#define YAFFS_LOSTNFOUND_MODE		0666
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
+#define Y_CURRENT_TIME CURRENT_TIME.tv_sec
+#define Y_TIME_CONVERT(x) (x).tv_sec
+#else
+#define Y_CURRENT_TIME CURRENT_TIME
+#define Y_TIME_CONVERT(x) (x)
+#endif
+
+#define yaffs_SumCompare(x,y) ((x) == (y))
+#define yaffs_strcmp(a,b) strcmp(a,b)
+
+#define TENDSTR "\n"
+#define TSTR(x) KERN_WARNING x
+#define TOUT(p) printk p
+
+#define yaffs_trace(mask, fmt, args...) \
+	do { if ((mask) & (yaffs_traceMask|YAFFS_TRACE_ERROR)) \
+		printk(KERN_WARNING "yaffs: " fmt, ## args); \
+	} while (0)
+
+#define compile_time_assertion(assertion) \
+	({ int x = __builtin_choose_expr(assertion, 0, (void)0); (void) x; })
+
+#elif defined CONFIG_YAFFS_DIRECT
+
+/* Direct interface */
+#include "ydirectenv.h"
+
+#elif defined CONFIG_YAFFS_UTIL
+
+/* Stuff for YAFFS utilities */
+
+#include "stdlib.h"
+#include "stdio.h"
+#include "string.h"
+
+#include "devextras.h"
+
+#define YMALLOC(x) malloc(x)
+#define YFREE(x)   free(x)
+#define YMALLOC_ALT(x) malloc(x)
+#define YFREE_ALT(x) free(x)
+
+#define YCHAR char
+#define YUCHAR unsigned char
+#define _Y(x)     x
+#define yaffs_strcpy(a,b)    strcpy(a,b)
+#define yaffs_strncpy(a,b,c) strncpy(a,b,c)
+#define yaffs_strlen(s)	     strlen(s)
+#define yaffs_sprintf	     sprintf
+#define yaffs_toupper(a)     toupper(a)
+
+#define Y_INLINE inline
+
+/* #define YINFO(s) YPRINTF(( __FILE__ " %d %s\n",__LINE__,s)) */
+/* #define YALERT(s) YINFO(s) */
+
+#define TENDSTR "\n"
+#define TSTR(x) x
+#define TOUT(p) printf p
+
+#define YAFFS_LOSTNFOUND_NAME		"lost+found"
+#define YAFFS_LOSTNFOUND_PREFIX		"obj"
+/* #define YPRINTF(x) printf x */
+
+#define YAFFS_ROOT_MODE				0666
+#define YAFFS_LOSTNFOUND_MODE		0666
+
+#define yaffs_SumCompare(x,y) ((x) == (y))
+#define yaffs_strcmp(a,b) strcmp(a,b)
+
+#else
+/* Should have specified a configuration type */
+#error Unknown configuration
+
+#endif
+
+/* see yaffs_fs.c */
+extern unsigned int yaffs_traceMask;
+extern unsigned int yaffs_wr_attempts;
+
+/*
+ * Tracing flags.
+ * The flags masked in YAFFS_TRACE_ALWAYS are always traced.
+ */
+ 
+#define YAFFS_TRACE_OS			0x00000002
+#define YAFFS_TRACE_ALLOCATE		0x00000004
+#define YAFFS_TRACE_SCAN		0x00000008
+#define YAFFS_TRACE_BAD_BLOCKS		0x00000010
+#define YAFFS_TRACE_ERASE		0x00000020
+#define YAFFS_TRACE_GC			0x00000040
+#define YAFFS_TRACE_WRITE		0x00000080
+#define YAFFS_TRACE_TRACING		0x00000100
+#define YAFFS_TRACE_DELETION		0x00000200
+#define YAFFS_TRACE_BUFFERS		0x00000400
+#define YAFFS_TRACE_NANDACCESS		0x00000800
+#define YAFFS_TRACE_GC_DETAIL		0x00001000
+#define YAFFS_TRACE_SCAN_DEBUG		0x00002000
+#define YAFFS_TRACE_MTD			0x00004000
+#define YAFFS_TRACE_CHECKPOINT		0x00008000
+
+#define YAFFS_TRACE_VERIFY		0x00010000
+#define YAFFS_TRACE_VERIFY_NAND		0x00020000
+#define YAFFS_TRACE_VERIFY_FULL		0x00040000
+#define YAFFS_TRACE_VERIFY_ALL		0x000F0000
+
+
+#define YAFFS_TRACE_ERROR		0x40000000
+#define YAFFS_TRACE_BUG			0x80000000
+#define YAFFS_TRACE_ALWAYS		0xF0000000
+
+
+#define T(mask,p) do{ if((mask) & (yaffs_traceMask | YAFFS_TRACE_ALWAYS)) TOUT(p);} while(0)
+
+#ifndef CONFIG_YAFFS_WINCE
+#define YBUG() T(YAFFS_TRACE_BUG,(TSTR("==>> yaffs bug: " __FILE__ " %d" TENDSTR),__LINE__))
+#endif
+
+#endif