mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-17 02:08:38 +00:00
1a4596601f
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
/*
|
|
* Copyright 2011 Freescale Semiconductor, Inc.
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <mmc.h>
|
|
#include <malloc.h>
|
|
|
|
/*
|
|
* The environment variables are written to just after the u-boot image
|
|
* on SDCard, so we must read the MBR to get the start address and code
|
|
* length of the u-boot image, then calculate the address of the env.
|
|
*/
|
|
#define ESDHC_BOOT_IMAGE_SIZE 0x48
|
|
#define ESDHC_BOOT_IMAGE_ADDR 0x50
|
|
|
|
int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
|
|
{
|
|
u8 *tmp_buf;
|
|
u32 blklen, code_offset, code_len, n;
|
|
|
|
blklen = mmc->read_bl_len;
|
|
tmp_buf = malloc(blklen);
|
|
if (!tmp_buf)
|
|
return 1;
|
|
|
|
/* read out the first block, get the config data information */
|
|
n = mmc->block_dev.block_read(mmc->block_dev.dev, 0, 1, tmp_buf);
|
|
if (!n) {
|
|
free(tmp_buf);
|
|
return 1;
|
|
}
|
|
|
|
/* Get the Source Address, from offset 0x50 */
|
|
code_offset = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_ADDR);
|
|
|
|
/* Get the code size from offset 0x48 */
|
|
code_len = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_SIZE);
|
|
|
|
*env_addr = code_offset + code_len;
|
|
|
|
free(tmp_buf);
|
|
|
|
return 0;
|
|
}
|