diff options
Diffstat (limited to 'common/env_nand.c')
| -rw-r--r-- | common/env_nand.c | 50 |
1 files changed, 49 insertions, 1 deletions
diff --git a/common/env_nand.c b/common/env_nand.c index 0a05b09..67c4a4e 100644 --- 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> @@ -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 */ |