Add NAND environment support for PPC440EPx Sequoia NAND boot config

Patch by Stefan Roese, 12 Sep 2006

CHANGELOG

@@ -2,6 +2,9 @@
 Changes since U-Boot 1.1.4:
 ======================================================================
 
+* Add NAND environment support for PPC440EPx Sequoia NAND boot config
+  Patch by Stefan Roese, 12 Sep 2006
+
 * Update NAND boot documentation
   Patch by Stefan Roese, 12 Sep 2006
 

board/amcc/sequoia/u-boot-nand.lds

@@ -1,5 +1,5 @@
 /*
- * (C) Copyright 2002
+ * (C) Copyright 2006
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * See file CREDITS for list of people who contributed to this
@@ -56,6 +56,12 @@ SECTIONS
 
     cpu/ppc4xx/start.o	(.text)
 
+    /* Align to next NAND block */
+    . = ALIGN(0x4000);
+    common/environment.o  (.ppcenv)
+    /* Keep some space here for redundant env and potential bad env blocks */
+    . = ALIGN(0x10000);
+
     *(.text)
     *(.fixup)
     *(.got1)

common/env_nand.c

@@ -2,7 +2,7 @@
  * (C) Copyright 2004
  * Jian Zhang, Texas Instruments, jzhang@ti.com.
 
- * (C) Copyright 2000-2004
+ * (C) Copyright 2000-2006
  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
  *
  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
@@ -76,7 +76,9 @@ env_t *env_ptr = 0;
 
 
 /* local functions */
+#if !defined(ENV_IS_EMBEDDED)
 static void use_default(void);
+#endif
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -91,11 +93,55 @@ uchar env_get_char_spec (int index)
  * Mark it OK for now. env_relocate() in env_common.c
  * will call our relocate function which will does
  * the real validation.
+ *
+ * When using a NAND boot image (like sequoia_nand), the environment
+ * can be embedded or attached to the U-Boot image in NAND flash. This way
+ * the SPL loads not only the U-Boot image from NAND but also the
+ * environment.
  */
 int env_init(void)
 {
+#if defined(ENV_IS_EMBEDDED)
+	ulong total;
+	int crc1_ok = 0, crc2_ok = 0;
+	env_t *tmp_env1, *tmp_env2;
+
+	total = CFG_ENV_SIZE;
+
+	tmp_env1 = env_ptr;
+	tmp_env2 = (env_t *)((ulong)env_ptr + CFG_ENV_SIZE);
+
+	crc1_ok = (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
+	crc2_ok = (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
+
+	if (!crc1_ok && !crc2_ok)
+		gd->env_valid = 0;
+	else if(crc1_ok && !crc2_ok)
+		gd->env_valid = 1;
+	else if(!crc1_ok && crc2_ok)
+		gd->env_valid = 2;
+	else {
+		/* both ok - check serial */
+		if(tmp_env1->flags == 255 && tmp_env2->flags == 0)
+			gd->env_valid = 2;
+		else if(tmp_env2->flags == 255 && tmp_env1->flags == 0)
+			gd->env_valid = 1;
+		else if(tmp_env1->flags > tmp_env2->flags)
+			gd->env_valid = 1;
+		else if(tmp_env2->flags > tmp_env1->flags)
+			gd->env_valid = 2;
+		else /* flags are equal - almost impossible */
+			gd->env_valid = 1;
+	}
+
+	if (gd->env_valid == 1)
+		env_ptr = tmp_env1;
+	else if (gd->env_valid == 2)
+		env_ptr = tmp_env2;
+#else /* ENV_IS_EMBEDDED */
 	gd->env_addr  = (ulong)&default_environment[0];
 	gd->env_valid = 1;
+#endif /* ENV_IS_EMBEDDED */
 
 	return (0);
 }
@@ -236,6 +282,7 @@ void env_relocate_spec (void)
 }
 #endif /* CFG_ENV_OFFSET_REDUND */
 
+#if !defined(ENV_IS_EMBEDDED)
 static void use_default()
 {
 	puts ("*** Warning - bad CRC or NAND, using default environment\n\n");
@@ -253,5 +300,6 @@ static void use_default()
 	gd->env_valid = 1;
 
 }
+#endif
 
 #endif /* CFG_ENV_IS_IN_NAND */

common/environment.c

@@ -60,7 +60,8 @@
      defined(CONFIG_RRVISION)	|| \
      defined(CONFIG_TRAB)   	|| \
      defined(CONFIG_PPCHAMELEONEVB) || \
-     defined(CONFIG_M5271EVB))	&& \
+     defined(CONFIG_M5271EVB)	|| \
+     defined(CONFIG_NAND_U_BOOT))	&& \
      defined(ENV_CRC) /* Environment embedded in U-Boot .ppcenv section */
 /* XXX - This only works with GNU C */
 #  define __PPCENV__ __attribute__ ((section(".ppcenv")))

include/configs/sequoia.h

@@ -69,14 +69,9 @@
 /*-----------------------------------------------------------------------
  * Initial RAM & stack pointer
  *----------------------------------------------------------------------*/
-#if 0
 /* 440EPx/440GRx have 16KB of internal SRAM, so no need for D-Cache	*/
-#define CFG_INIT_RAM_DCACHE	1		/* d-cache as init ram	*/
-#define CFG_INIT_RAM_ADDR	0x70000000	/* DCache		*/
-#else
 #define CFG_INIT_RAM_OCM	1		/* OCM as init ram	*/
 #define CFG_INIT_RAM_ADDR	CFG_OCM_BASE	/* OCM			*/
-#endif
 
 #define CFG_INIT_RAM_END	(4 << 10)
 #define CFG_GBL_DATA_SIZE	256		/* num bytes initial data */
@@ -98,18 +93,11 @@
 /*-----------------------------------------------------------------------
  * Environment
  *----------------------------------------------------------------------*/
-/*
- * Define here the location of the environment variables (FLASH or EEPROM).
- * Note: DENX encourages to use redundant environment in FLASH.
- */
-#if 1 /* test-only */
+#if !defined(CONFIG_NAND_U_BOOT) && !defined(CONFIG_NAND_SPL)
 #define CFG_ENV_IS_IN_FLASH     1	/* use FLASH for environment vars	*/
 #else
 #define CFG_ENV_IS_IN_NAND	1	/* use NAND for environment vars	*/
 #endif
-#if 0
-#define CFG_ENV_IS_IN_EEPROM	1	/* use EEPROM for environment vars	*/
-#endif
 
 /*-----------------------------------------------------------------------
  * FLASH related
@@ -189,8 +177,12 @@
 #undef CFG_NAND_4_ADDR_CYCLE			/* No fourth addr used (<=32MB)	*/
 
 #ifdef CFG_ENV_IS_IN_NAND
-#define CFG_ENV_SIZE		0x4000
-#define CFG_ENV_OFFSET		(CFG_NAND_U_BOOT_OFFS + CFG_NAND_U_BOOT_SIZE)
+/*
+ * For NAND booting the environment is embedded in the U-Boot image. Please take
+ * look at the file board/amcc/sequoia/u-boot-nand.lds for details.
+ */
+#define CFG_ENV_SIZE		CFG_NAND_BLOCK_SIZE
+#define CFG_ENV_OFFSET		(CFG_NAND_U_BOOT_OFFS + CFG_ENV_SIZE)
 #define CFG_ENV_OFFSET_REDUND	(CFG_ENV_OFFSET + CFG_ENV_SIZE)
 #endif
 
@@ -214,11 +206,6 @@
 #define CFG_EEPROM_PAGE_WRITE_BITS 3
 #define CFG_EEPROM_PAGE_WRITE_DELAY_MS 10
 
-#ifdef CFG_ENV_IS_IN_EEPROM
-#define CFG_ENV_SIZE		0x200		/* Size of Environment vars	*/
-#define CFG_ENV_OFFSET		0x0
-#endif /* CFG_ENV_IS_IN_EEPROM */
-
 /* I2C SYSMON (LM75, AD7414 is almost compatible)			*/
 #define CONFIG_DTT_LM75		1		/* ON Semi's LM75	*/
 #define CONFIG_DTT_AD7414	1		/* use AD7414		*/

include/environment.h

@@ -79,6 +79,10 @@
 # ifdef CFG_ENV_OFFSET_REDUND
 #  define CFG_REDUNDAND_ENVIRONMENT
 # endif
+# if defined(CONFIG_NAND_U_BOOT)
+/* Use embedded environment in NAND boot versions */
+#  define ENV_IS_EMBEDDED	1
+# endif
 #endif /* CFG_ENV_IS_IN_NAND */
 
 

nand_spl/nand_boot.c

@@ -166,8 +166,7 @@ void nand_boot(void)
 	/*
 	 * Load U-Boot image from NAND into RAM
 	 */
-	ret = nand_load(&nand_info, CFG_NAND_U_BOOT_OFFS,
-			CFG_NAND_U_BOOT_SIZE,
+	ret = nand_load(&nand_info, CFG_NAND_U_BOOT_OFFS, CFG_NAND_U_BOOT_SIZE,
 			(uchar *)CFG_NAND_U_BOOT_DST);
 
 	/*