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1ac63e40 JH |
1 | /* |
2 | * Copyright 2011 Freescale Semiconductor, Inc. | |
3 | * | |
1a459660 | 4 | * SPDX-License-Identifier: GPL-2.0+ |
1ac63e40 JH |
5 | */ |
6 | ||
7 | #include <common.h> | |
8 | #include <mmc.h> | |
9 | #include <malloc.h> | |
10 | ||
11 | /* | |
12 | * The environment variables are written to just after the u-boot image | |
13 | * on SDCard, so we must read the MBR to get the start address and code | |
14 | * length of the u-boot image, then calculate the address of the env. | |
15 | */ | |
16 | #define ESDHC_BOOT_IMAGE_SIZE 0x48 | |
17 | #define ESDHC_BOOT_IMAGE_ADDR 0x50 | |
18 | ||
d196bd88 | 19 | int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr) |
1ac63e40 JH |
20 | { |
21 | u8 *tmp_buf; | |
22 | u32 blklen, code_offset, code_len, n; | |
23 | ||
24 | blklen = mmc->read_bl_len; | |
25 | tmp_buf = malloc(blklen); | |
26 | if (!tmp_buf) | |
27 | return 1; | |
28 | ||
29 | /* read out the first block, get the config data information */ | |
30 | n = mmc->block_dev.block_read(mmc->block_dev.dev, 0, 1, tmp_buf); | |
31 | if (!n) { | |
32 | free(tmp_buf); | |
33 | return 1; | |
34 | } | |
35 | ||
36 | /* Get the Source Address, from offset 0x50 */ | |
37 | code_offset = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_ADDR); | |
38 | ||
39 | /* Get the code size from offset 0x48 */ | |
40 | code_len = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_SIZE); | |
41 | ||
42 | *env_addr = code_offset + code_len; | |
43 | ||
44 | free(tmp_buf); | |
45 | ||
46 | return 0; | |
47 | } |