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 } 64