1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright 2011 Freescale Semiconductor, Inc. 4 */ 5 6 #include <common.h> 7 #include <mmc.h> 8 #include <malloc.h> 9 10 /* 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. 14 */ 15 #define ESDHC_BOOT_IMAGE_SIZE 0x48 16 #define ESDHC_BOOT_IMAGE_ADDR 0x50 17 18 #define ESDHC_DEFAULT_ENVADDR 0x400 19 20 int mmc_get_env_addr(struct mmc *mmc, int copy, u32 *env_addr) 21 { 22 u8 *tmp_buf; 23 u32 blklen, code_offset, code_len, n; 24 25 blklen = mmc->read_bl_len; 26 tmp_buf = malloc(blklen); 27 if (!tmp_buf) 28 return 1; 29 30 /* read out the first block, get the config data information */ 31 n = mmc->block_dev.block_read(&mmc->block_dev, 0, 1, tmp_buf); 32 if (!n) { 33 free(tmp_buf); 34 return 1; 35 } 36 37 /* Get the Source Address, from offset 0x50 */ 38 code_offset = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_ADDR); 39 40 /* Get the code size from offset 0x48 */ 41 code_len = *(u32 *)(tmp_buf + ESDHC_BOOT_IMAGE_SIZE); 42 43 #ifdef CONFIG_ESDHC_HC_BLK_ADDR 44 /* 45 * On soc BSC9131, BSC9132: 46 * In High Capacity SD Cards (> 2 GBytes), the 32-bit source address and 47 * code length of these soc specify the memory address in block address 48 * format. Block length is fixed to 512 bytes as per the SD High 49 * Capacity specification. 50 */ 51 u64 tmp; 52 53 if (mmc->high_capacity) { 54 tmp = (u64)code_offset * blklen; 55 tmp += code_len * blklen; 56 } else 57 tmp = code_offset + code_len; 58 59 if ((tmp + CONFIG_ENV_SIZE > mmc->capacity) || 60 (tmp > 0xFFFFFFFFU)) 61 *env_addr = ESDHC_DEFAULT_ENVADDR; 62 else 63 *env_addr = tmp; 64 65 free(tmp_buf); 66 67 return 0; 68 #endif 69 70 *env_addr = code_offset + code_len; 71 72 free(tmp_buf); 73 74 return 0; 75 } 76