void env_relocate_spec (void)
{
unsigned int off = CONFIG_ENV_OFFSET;
#ifdef CONFIG_ENV_OFFSET_REDUND
if (gd->env_valid == 2)
off = CONFIG_ENV_OFFSET_REDUND;
#endif
eeprom_bus_read (CONFIG_SYS_DEF_EEPROM_ADDR,
off,
(uchar*)env_ptr,
CONFIG_ENV_SIZE);
}
void env_relocate_spec(void)
{
char buf[CONFIG_ENV_SIZE];
unsigned int off = CONFIG_ENV_OFFSET;
#ifdef CONFIG_ENV_OFFSET_REDUND
if (gd->env_valid == 2)
off = CONFIG_ENV_OFFSET_REDUND;
#endif
eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
off, (uchar *)buf, CONFIG_ENV_SIZE);
env_import(buf, 1);
}
uchar env_get_char_spec(int index)
{
uchar c;
unsigned int off = CONFIG_ENV_OFFSET;
#ifdef CONFIG_ENV_OFFSET_REDUND
if (gd->env_valid == 2)
off = CONFIG_ENV_OFFSET_REDUND;
#endif
eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
off + index + offsetof(env_t, data), &c, 1);
return c;
}
int env_init(void)
{
ulong len, crc[2], crc_tmp;
unsigned int off, off_env[2];
uchar buf[64], flags[2];
int i, crc_ok[2] = {0, 0};
eeprom_init(); /* prepare for EEPROM read/write */
off_env[0] = CONFIG_ENV_OFFSET;
off_env[1] = CONFIG_ENV_OFFSET_REDUND;
for (i = 0; i < 2; i++) {
/* read CRC */
eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
off_env[i] + offsetof(env_t, crc),
(uchar *)&crc[i], sizeof(ulong));
/* read FLAGS */
eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR,
off_env[i] + offsetof(env_t, flags),
(uchar *)&flags[i], sizeof(uchar));
crc_tmp = 0;
len = ENV_SIZE;
off = off_env[i] + offsetof(env_t, data);
while (len > 0) {
int n = (len > sizeof(buf)) ? sizeof(buf) : len;
eeprom_bus_read(CONFIG_SYS_DEF_EEPROM_ADDR, off,
buf, n);
crc_tmp = crc32(crc_tmp, buf, n);
len -= n;
off += n;
}
if (crc_tmp == crc[i])
crc_ok[i] = 1;
}
if (!crc_ok[0] && !crc_ok[1]) {
gd->env_addr = 0;
gd->env_valid = 0;
return 0;
} else if (crc_ok[0] && !crc_ok[1]) {
gd->env_valid = 1;
} else if (!crc_ok[0] && crc_ok[1]) {
gd->env_valid = 2;
} else {
/* both ok - check serial */
if (flags[0] == ACTIVE_FLAG && flags[1] == OBSOLETE_FLAG)
gd->env_valid = 1;
else if (flags[0] == OBSOLETE_FLAG && flags[1] == ACTIVE_FLAG)
gd->env_valid = 2;
else if (flags[0] == 0xFF && flags[1] == 0)
gd->env_valid = 2;
else if (flags[1] == 0xFF && flags[0] == 0)
gd->env_valid = 1;
else /* flags are equal - almost impossible */
gd->env_valid = 1;
}
if (gd->env_valid == 2)
gd->env_addr = off_env[1] + offsetof(env_t, data);
else if (gd->env_valid == 1)
gd->env_addr = off_env[0] + offsetof(env_t, data);
return 0;
}
