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https://source.denx.de/u-boot/u-boot.git
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64 lines
1.8 KiB
C
64 lines
1.8 KiB
C
/*
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* Copyright 2011 Freescale Semiconductor, Inc.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <mmc.h>
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#include <malloc.h>
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/*
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* The environment variables are written to just after the u-boot image
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* on SDCard, so we must read the MBR to get the start address and code
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* length of the u-boot image, then calculate the address of the env.
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*/
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#define ESDHC_BOOT_IMAGE_SIZE 0x48
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#define ESDHC_BOOT_IMAGE_ADDR 0x50
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int mmc_get_env_addr(struct mmc *mmc, u32 *env_addr)
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{
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u8 *tmp_buf;
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u32 blklen, code_offset, code_len, n;
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blklen = mmc->read_bl_len;
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tmp_buf = malloc(blklen);
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if (!tmp_buf)
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return 1;
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/* read out the first block, get the config data information */
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n = mmc->block_dev.block_read(mmc->block_dev.dev, 0, 1, tmp_buf);
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if (!n) {
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free(tmp_buf);
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return 1;
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}
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/* Get the Source Address, from offset 0x50 */
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code_offset = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_ADDR);
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/* Get the code size from offset 0x48 */
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code_len = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_SIZE);
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*env_addr = code_offset + code_len;
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free(tmp_buf);
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return 0;
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}
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