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env: dataflash: fix env_init issue 

As the SPI controller is not initialized before env_init(), it causes
reading env in dataflash failed. So, although saveenv() successfully,
it shows warning information when reboot the system as following:

  *** Warning - bad CRC, using default environment

Let the env_relocate() to check env CRC and import it.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
This commit is contained in:
Bo Shen 2013-10-08 16:30:21 +08:00 committed by Tom Rini
parent 47a4bea6af
commit cca2011e62
1 changed files with 18 additions and 32 deletions
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50
common/env_dataflash.c
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@ -29,11 +29,25 @@ uchar env_get_char_spec(int index)
void env_relocate_spec(void)
{
ulong crc, new = 0;
unsigned off;
char buf[CONFIG_ENV_SIZE];
/* Read old CRC */
read_dataflash(CONFIG_ENV_ADDR + offsetof(env_t, crc),
sizeof(ulong), (char *)&crc);
/* Read whole environment */
read_dataflash(CONFIG_ENV_ADDR, CONFIG_ENV_SIZE, buf);
env_import(buf, 1);
/* Calculate the CRC */
off = offsetof(env_t, data);
new = crc32(new, (unsigned char *)(buf + off), ENV_SIZE);
if (crc == new)
env_import(buf, 1);
else
set_default_env("!bad CRC");
}
#ifdef CONFIG_ENV_OFFSET_REDUND
@ -67,37 +81,9 @@ int saveenv(void)
*/
int env_init(void)
{
ulong crc, len = ENV_SIZE, new = 0;
unsigned off;
uchar buf[64];
if (gd->env_valid)
return 0;
AT91F_DataflashInit(); /* prepare for DATAFLASH read/write */
/* read old CRC */
read_dataflash(CONFIG_ENV_ADDR + offsetof(env_t, crc),
sizeof(ulong), (char *)&crc);
off = offsetof(env_t, data);
while (len > 0) {
int n = (len > sizeof(buf)) ? sizeof(buf) : len;
read_dataflash(CONFIG_ENV_ADDR + off, n, (char *)buf);
new = crc32(new, buf, n);
len -= n;
off += n;
}
if (crc == new) {
gd->env_addr = offsetof(env_t, data);
gd->env_valid = 1;
} else {
gd->env_addr = (ulong)&default_environment[0];
gd->env_valid = 0;
}
/* use default */
gd->env_addr = (ulong)&default_environment[0];
gd->env_valid = 1;
return 0;
}