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1 | /* |
2 | * Copyright 2011 Freescale Semiconductor, Inc. | |
3 | * | |
4 | * See file CREDITS for list of people who contributed to this | |
5 | * project. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License as | |
9 | * published by the Free Software Foundation; either version 2 of | |
10 | * the License, or (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, | |
20 | * MA 02111-1307 USA | |
21 | */ | |
22 | ||
23 | #include <common.h> | |
24 | #include <mmc.h> | |
25 | #include <malloc.h> | |
26 | ||
27 | /* | |
28 | * The environment variables are written to just after the u-boot image | |
29 | * on SDCard, so we must read the MBR to get the start address and code | |
30 | * length of the u-boot image, then calculate the address of the env. | |
31 | */ | |
32 | #define ESDHC_BOOT_IMAGE_SIZE 0x48 | |
33 | #define ESDHC_BOOT_IMAGE_ADDR 0x50 | |
34 | ||
e9e37421 | 35 | int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr) |
b9944a77 DE |
36 | { |
37 | u8 *tmp_buf; | |
38 | u32 blklen, code_offset, code_len, n; | |
39 | ||
40 | blklen = mmc->read_bl_len; | |
41 | tmp_buf = malloc(blklen); | |
42 | if (!tmp_buf) | |
43 | return 1; | |
44 | ||
45 | /* read out the first block, get the config data information */ | |
46 | n = mmc->block_dev.block_read(mmc->block_dev.dev, 0, 1, tmp_buf); | |
47 | if (!n) { | |
48 | free(tmp_buf); | |
49 | return 1; | |
50 | } | |
51 | ||
52 | /* Get the Source Address, from offset 0x50 */ | |
53 | code_offset = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_ADDR); | |
54 | ||
55 | /* Get the code size from offset 0x48 */ | |
56 | code_len = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_SIZE); | |
57 | ||
58 | *env_addr = code_offset + code_len; | |
59 | ||
60 | free(tmp_buf); | |
61 | ||
62 | return 0; | |
63 | } |