diff options
Diffstat (limited to 'common/env_dataflash.c')
| -rw-r--r-- | common/env_dataflash.c | 50 |
1 files changed, 18 insertions, 32 deletions
diff --git a/common/env_dataflash.c b/common/env_dataflash.c index 5f21d5c38..b53b87e95 100644 --- a/common/env_dataflash.c +++ b/common/env_dataflash.c @@ -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; } |