80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2011 Freescale Semiconductor, Inc.
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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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#define ESDHC_DEFAULT_ENVADDR 0x400
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int mmc_get_env_addr(struct mmc *mmc, int copy, 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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#ifdef CONFIG_BLK
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n = blk_dread(mmc_get_blk_desc(mmc), 0, 1, tmp_buf);
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#else
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n = mmc->block_dev.block_read(&mmc->block_dev, 0, 1, tmp_buf);
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#endif
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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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#ifdef CONFIG_ESDHC_HC_BLK_ADDR
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/*
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* On soc BSC9131, BSC9132:
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* In High Capacity SD Cards (> 2 GBytes), the 32-bit source address and
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* code length of these soc specify the memory address in block address
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* format. Block length is fixed to 512 bytes as per the SD High
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* Capacity specification.
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*/
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u64 tmp;
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if (mmc->high_capacity) {
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tmp = (u64)code_offset * blklen;
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tmp += code_len * blklen;
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} else
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tmp = code_offset + code_len;
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if ((tmp + CONFIG_ENV_SIZE > mmc->capacity) ||
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(tmp > 0xFFFFFFFFU))
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*env_addr = ESDHC_DEFAULT_ENVADDR;
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else
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*env_addr = tmp;
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free(tmp_buf);
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return 0;
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#endif
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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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