fix comments with new drivers organization

[karo-tx-uboot.git] / common / env_nand.c

diff --git a/common/env_nand.c b/common/env_nand.c
index 0a05b09a7a8515622edee793710b16a7f323e536..ce0a2514db458f8bd7cac293ccd7ecdf21ea7d42 100644 (file)
--- a/common/env_nand.c
+++ b/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>
@@ -39,10 +39,10 @@
 #include <malloc.h>
 #include <nand.h>
 
-#if ((CONFIG_COMMANDS&(CFG_CMD_ENV|CFG_CMD_NAND)) == (CFG_CMD_ENV|CFG_CMD_NAND))
+#if defined(CONFIG_CMD_ENV) && defined(CONFIG_CMD_NAND)
 #define CMD_SAVEENV
 #elif defined(CFG_ENV_OFFSET_REDUND)
-#error Cannot use CFG_ENV_OFFSET_REDUND without CFG_CMD_ENV & CFG_CMD_NAND
+#error Cannot use CFG_ENV_OFFSET_REDUND without CONFIG_CMD_ENV & CONFIG_CMD_NAND
 #endif
 
 #if defined(CFG_ENV_SIZE_REDUND) && (CFG_ENV_SIZE_REDUND != CFG_ENV_SIZE)
@@ -57,7 +57,7 @@ int nand_legacy_rw (struct nand_chip* nand, int cmd,
            size_t start, size_t len,
            size_t * retlen, u_char * buf);
 
-/* info for NAND chips, defined in drivers/nand/nand.c */
+/* info for NAND chips, defined in drivers/mtd/nand/nand.c */
 extern nand_info_t nand_info[];
 
 /* references to names in env_common.c */
@@ -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 */