MX31ADS network and flash updates

This patch allows U-Boot to use buffered writes to the Spansion NOR
flash installed on this board, and eliminates long delays in network
transfers after the board startup.

Also modify flash layout to embed main and redundant environment
blocks in the U-Boot image.

Signed-off-by: Guennadi Liakhovetski <lg@denx.de>

board/mx31ads/mx31ads.c

@@ -38,18 +38,18 @@ int dram_init (void)
 int board_init (void)
 {
 	int i;
-#if 0
+
 	/* CS0: Nor Flash */
 	/*
-	 * These are values from the RedBoot sources by Freescale. However,
-	 * under U-Boot with this configuration 32-bit accesses don't work,
-	 * lower 16 bits of data are read twice for each 32-bit read.
+	 * CS0L and CS0A values are from the RedBoot sources by Freescale
+	 * and are also equal to those used by Sascha Hauer for the Phytec
+	 * i.MX31 board. CS0U is just a slightly optimized hardware default:
+	 * the only non-zero field "Wait State Control" is set to half the
+	 * default value.
 	 */
-	__REG(CSCR_U(0)) = 0x23524E80;
-	__REG(CSCR_L(0)) = 0x10000D03; /* WRAP bit (1) is suspicious here, but
-					* disabling it doesn't help either */
+	__REG(CSCR_U(0)) = 0x00000f00;
+	__REG(CSCR_L(0)) = 0x10000D03;
 	__REG(CSCR_A(0)) = 0x00720900;
-#endif
 
 	/* setup pins for UART1 */
 	mx31_gpio_mux(MUX_RXD1__UART1_RXD_MUX);

board/mx31ads/u-boot.lds

@@ -34,7 +34,18 @@ SECTIONS
 	. = ALIGN(4);
 	.text	   :
 	{
-	  cpu/arm1136/start.o	(.text)
+	  /* WARNING - the following is hand-optimized to fit within	*/
+	  /* the sector layout of our flash chips!	XXX FIXME XXX	*/
+
+	  cpu/arm1136/start.o		(.text)
+	  board/mx31ads/libmx31ads.a	(.text)
+	  lib_arm/libarm.a		(.text)
+	  net/libnet.a			(.text)
+	  drivers/mtd/libmtd.a		(.text)
+
+	  . = DEFINED(env_offset) ? env_offset : .;
+	  common/environment.o(.text)
+
 	  *(.text)
 	}
 

include/configs/mx31ads.h

@@ -72,7 +72,6 @@
 
 #include <config_cmd_default.h>
 
-#define CONFIG_CMD_MII
 #define CONFIG_CMD_PING
 
 #define CONFIG_BOOTDELAY	3
@@ -91,7 +90,19 @@
 
 #define CONFIG_DRIVER_CS8900	1
 #define CS8900_BASE		0xb4020300
-#define CS8900_BUS16		1	/* the Linux driver does accesses as shorts */
+#define CS8900_BUS16		1	/* follow the Linux driver */
+
+/*
+ * The MX31ADS board seems to have a hardware "peculiarity" confirmed under
+ * U-Boot, RedBoot and Linux: the ethernet Rx signal is reaching the CS8900A
+ * controller inverted. The controller is capable of detecting and correcting
+ * this, but it needs 4 network packets for that. Which means, at startup, you
+ * will not receive answers to the first 4 packest, unless there have been some
+ * broadcasts on the network, or your board is on a hub. Reducing the ARP
+ * timeout from default 5 seconds to 200ms we speed up the initial TFTP
+ * transfer, should the user wish one, significantly.
+ */
+#define CONFIG_ARP_TIMEOUT	200UL
 
 /*
  * Miscellaneous configurable options
@@ -100,7 +111,7 @@
 #define CFG_PROMPT		"=> "
 #define CFG_CBSIZE		256		/* Console I/O Buffer Size */
 /* Print Buffer Size */
-#define CFG_PBSIZE		(CFG_CBSIZE+sizeof(CFG_PROMPT)+16)
+#define CFG_PBSIZE		(CFG_CBSIZE + sizeof(CFG_PROMPT) + 16)
 #define CFG_MAXARGS		16		/* max number of command args */
 #define CFG_BARGSIZE		CFG_CBSIZE	/* Boot Argument Buffer Size */
 
@@ -136,25 +147,29 @@
 #define CFG_MAX_FLASH_BANKS	1		/* max number of memory banks */
 #define CFG_MAX_FLASH_SECT	262		/* max number of sectors on one chip */
 #define CFG_MONITOR_BASE	CFG_FLASH_BASE	/* Monitor at beginning of flash */
-#define CFG_MONITOR_LEN		(128 * 1024)	/* Reserve 128KiB */
+#define CFG_MONITOR_LEN		(256 * 1024)	/* Reserve 256KiB */
 
 #define	CFG_ENV_IS_IN_FLASH	1
 #define CFG_ENV_SECT_SIZE	(32 * 1024)
 #define CFG_ENV_SIZE		CFG_ENV_SECT_SIZE
+
+/* Address and size of Redundant Environment Sector	*/
+#define CFG_ENV_OFFSET_REDUND	(CFG_ENV_OFFSET + CFG_ENV_SIZE)
+#define CFG_ENV_SIZE_REDUND	CFG_ENV_SIZE
+
 /* S29WS256N NOR flash has 4 32KiB small sectors at the beginning and at the end.
  * The rest of 32MiB is in 128KiB big sectors. U-Boot occupies the low 4 sectors,
  * if we put environment next to it, we will have to occupy 128KiB for it.
  * Putting it at the top of flash we use only 32KiB. */
-#define CFG_ENV_ADDR		(CFG_MONITOR_BASE + 32 * 1024 * 1024 - CFG_ENV_SIZE)
+#define CFG_ENV_ADDR		(CFG_MONITOR_BASE + CFG_ENV_SECT_SIZE)
 
 /*-----------------------------------------------------------------------
  * CFI FLASH driver setup
  */
 #define CFG_FLASH_CFI			1 /* Flash memory is CFI compliant */
 #define CFG_FLASH_CFI_DRIVER		1 /* Use drivers/cfi_flash.c */
-#if 0 /* Doesn't work yet, work in progress */
+#define CONFIG_FLASH_SPANSION_S29WS_N	1 /* A non-standard buffered write algorithm */
 #define CFG_FLASH_USE_BUFFER_WRITE	1 /* Use buffered writes (~10x faster) */
-#endif
 #define CFG_FLASH_PROTECTION		1 /* Use hardware sector protection */
 
 /*