uboot for s3c2410 nandboot 使用saveenv保存环…

1、因为定义了CFG_NAND_LEGACY，因此主要修改saveenv中对nand的读写函数为nand_legacy的读写函数，修改common/env_nand.c如下：
#include

#if defined(CFG_ENV_IS_IN_NAND) /* Environment is in Nand Flash */

#include
#include
#include
#include
#include

#if ((CONFIG_COMMANDS&(CFG_CMD_ENV|CFG_CMD_NAND)) == (CFG_CMD_ENV|CFG_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
#endif

#if defined(CFG_ENV_SIZE_REDUND) && (CFG_ENV_SIZE_REDUND != CFG_ENV_SIZE)
#error CFG_ENV_SIZE_REDUND should be the same as CFG_ENV_SIZE
#endif

#ifdef CONFIG_INFERNO
#error CONFIG_INFERNO not supported yet
#endif

/*  My Add*/
int nand_legacy_erase(struct nand_chip* nand,
size_t ofs, size_t len, int clean);

int nand_legacy_rw (struct nand_chip* nand, int cmd,
    size_t start, size_t len,
    size_t * retlen, u_char * buf);

/*  My Add*/
extern struct nand_chip nand_dev_desc[CFG_MAX_NAND_DEVICE];


/* info for NAND chips, defined in drivers/nand/nand.c */
//extern nand_info_t nand_info[];
nand_info_t nand_info[CFG_MAX_NAND_DEVICE];

/* references to names in env_common.c */
extern uchar default_environment[];
extern int default_environment_size;

char * env_name_spec = "NAND";


#ifdef ENV_IS_EMBEDDED
extern uchar environment[];
env_t *env_ptr = (env_t *)(&environment[0]);
#else /* ! ENV_IS_EMBEDDED */
env_t *env_ptr = 0;
#endif /* ENV_IS_EMBEDDED */


/* local functions */
#if !defined(ENV_IS_EMBEDDED)
static void use_default(void);
#endif

DECLARE_GLOBAL_DATA_PTR;

uchar env_get_char_spec (int index)
{
return ( *((uchar *)(gd->env_addr + index)) );
}


/* this is called before nand_init()
* so we can't read Nand to validate env data.
* 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);

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