1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright 2011 Freescale Semiconductor, Inc.
11 * The environment variables are written to just after the u-boot image
12 * on SDCard, so we must read the MBR to get the start address and code
13 * length of the u-boot image, then calculate the address of the env.
15 #define ESDHC_BOOT_IMAGE_SIZE 0x48
16 #define ESDHC_BOOT_IMAGE_ADDR 0x50
18 #define ESDHC_DEFAULT_ENVADDR 0x400
20 int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr)
23 u32 blklen, code_offset, code_len, n;
25 blklen = mmc->read_bl_len;
26 tmp_buf = malloc(blklen);
30 /* read out the first block, get the config data information */
32 n = blk_dread(mmc_get_blk_desc(mmc), 0, 1, tmp_buf);
34 n = mmc->block_dev.block_read(&mmc->block_dev, 0, 1, tmp_buf);
41 /* Get the Source Address, from offset 0x50 */
42 code_offset = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_ADDR);
44 /* Get the code size from offset 0x48 */
45 code_len = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_SIZE);
47 #ifdef CONFIG_ESDHC_HC_BLK_ADDR
49 * On soc BSC9131, BSC9132:
50 * In High Capacity SD Cards (> 2 GBytes), the 32-bit source address and
51 * code length of these soc specify the memory address in block address
52 * format. Block length is fixed to 512 bytes as per the SD High
53 * Capacity specification.
57 if (mmc->high_capacity) {
58 tmp = (u64)code_offset * blklen;
59 tmp += code_len * blklen;
61 tmp = code_offset + code_len;
63 if ((tmp + CONFIG_ENV_SIZE > mmc->capacity) ||
65 *env_addr = ESDHC_DEFAULT_ENVADDR;
74 *env_addr = code_offset + code_len;