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env_mmc: Allow board code to override the environment address

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On some boards the environment may not be located at a fixed address in
the MMC/SDHC card.  This allows those boards to implement their own
means to report what address the environment is located at.

Signed-off-by: Mingkai Hu <Mingkai.hu@freescale.com>
Signed-off-by: Jerry Huang <Chang-Ming.Huang@freescale.com>
Signed-off-by: Zhao Chenhui <b35336@freescale.com>
Acked-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
Mingkai Hu 2011-01-24 17:09:55 +00:00 committed by Kumar Gala
parent c2a63f48fb
commit 97039ab98c
1 changed files with 27 additions and 4 deletions
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31
common/env_mmc.c
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@ -1,5 +1,5 @@
/*
* (C) Copyright 2008-2010 Freescale Semiconductor, Inc.
* (C) Copyright 2008-2011 Freescale Semiconductor, Inc.
*
* See file CREDITS for list of people who contributed to this
* project.
@ -51,6 +51,19 @@ static void use_default(void);
DECLARE_GLOBAL_DATA_PTR;
#if !defined(CONFIG_ENV_OFFSET)
#define CONFIG_ENV_OFFSET 0
#endif
static int __mmc_get_env_addr(struct mmc *mmc, u32 *env_addr)
{
*env_addr = CONFIG_ENV_OFFSET;
return 0;
}
__attribute__((weak, alias("__mmc_get_env_addr")))
int mmc_get_env_addr(struct mmc *mmc, u32 *env_addr);
uchar env_get_char_spec(int index)
{
return *((uchar *)(gd->env_addr + index));
@ -102,10 +115,14 @@ int saveenv(void)
ssize_t len;
char *res;
struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
u32 offset;
if (init_mmc_for_env(mmc))
return 1;
if(mmc_get_env_addr(mmc, &offset))
return 1;
res = (char *)&env_new.data;
len = hexport_r(&env_htab, '\0', &res, ENV_SIZE);
if (len < 0) {
@ -114,7 +131,7 @@ int saveenv(void)
}
env_new.crc = crc32(0, env_new.data, ENV_SIZE);
printf("Writing to MMC(%d)... ", CONFIG_SYS_MMC_ENV_DEV);
if (write_env(mmc, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, (u_char *)&env_new)) {
if (write_env(mmc, CONFIG_ENV_SIZE, offset, (u_char *)&env_new)) {
puts("failed\n");
return 1;
}
@ -141,16 +158,22 @@ inline int read_env(struct mmc *mmc, unsigned long size,
void env_relocate_spec(void)
{
#if !defined(ENV_IS_EMBEDDED)
char buf[CONFIG_ENV_SIZE];
char buf[CONFIG_ENV_SIZE];
struct mmc *mmc = find_mmc_device(CONFIG_SYS_MMC_ENV_DEV);
u32 offset;
if (init_mmc_for_env(mmc)) {
use_default();
return;
}
if (read_env(mmc, CONFIG_ENV_SIZE, CONFIG_ENV_OFFSET, buf)) {
if(mmc_get_env_addr(mmc, &offset)) {
use_default();
return ;
}
if (read_env(mmc, CONFIG_ENV_SIZE, offset, buf)) {
use_default();
return;
}