| Dirk Eibach | b9944a7 | 2013-06-26 15:55:17 +0200 | [diff] [blame] | 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 | |
| 35 | int mmc_get_env_addr(struct mmc *mmc, u32 *env_addr) |
| 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 | } |