1 /* 2 * Copyright 2013 Freescale Semiconductor, Inc. 3 * 4 * SPDX-License-Identifier: GPL-2.0+ 5 */ 6 7 #include <common.h> 8 #include <mmc.h> 9 #include <malloc.h> 10 11 /* 12 * The environment variables are written to just after the u-boot image 13 * on SDCard, so we must read the MBR to get the start address and code 14 * length of the u-boot image, then calculate the address of the env. 15 */ 16 #define ESDHC_BOOT_IMAGE_SIZE 0x48 17 #define ESDHC_BOOT_IMAGE_ADDR 0x50 18 #define MBRDBR_BOOT_SIG_55 0x1fe 19 #define MBRDBR_BOOT_SIG_AA 0x1ff 20 #define CONFIG_CFG_DATA_SECTOR 0 21 22 /* 23 * The main entry for mmc booting. It's necessary that SDRAM is already 24 * configured and available since this code loads the main U-Boot image 25 * from mmc into SDRAM and starts it from there. 26 */ 27 28 void __noreturn mmc_boot(void) 29 { 30 __attribute__((noreturn)) void (*uboot)(void); 31 uint blk_start, blk_cnt, err; 32 u32 blklen; 33 uchar *tmp_buf; 34 uchar val; 35 uint i, byte_num; 36 u32 offset, code_len; 37 struct mmc *mmc; 38 39 mmc = find_mmc_device(0); 40 if (!mmc) { 41 puts("spl: mmc device not found!!\n"); 42 hang(); 43 } 44 45 blklen = mmc->read_bl_len; 46 tmp_buf = malloc(blklen); 47 if (!tmp_buf) { 48 puts("spl: malloc memory failed!!\n"); 49 hang(); 50 } 51 memset(tmp_buf, 0, blklen); 52 53 /* 54 * Read source addr from sd card 55 */ 56 err = mmc->block_dev.block_read(0, CONFIG_CFG_DATA_SECTOR, 1, tmp_buf); 57 if (err != 1) { 58 puts("spl: mmc read failed!!\n"); 59 free(tmp_buf); 60 hang(); 61 } 62 63 val = *(tmp_buf + MBRDBR_BOOT_SIG_55); 64 if (0x55 != val) { 65 puts("spl: mmc signature is not valid!!\n"); 66 free(tmp_buf); 67 hang(); 68 } 69 val = *(tmp_buf + MBRDBR_BOOT_SIG_AA); 70 if (0xAA != val) { 71 puts("spl: mmc signature is not valid!!\n"); 72 free(tmp_buf); 73 hang(); 74 } 75 76 byte_num = 4; 77 offset = 0; 78 for (i = 0; i < byte_num; i++) { 79 val = *(tmp_buf + ESDHC_BOOT_IMAGE_ADDR + i); 80 offset = (offset << 8) + val; 81 } 82 offset += CONFIG_SYS_MMC_U_BOOT_OFFS; 83 /* Get the code size from offset 0x48 */ 84 byte_num = 4; 85 code_len = 0; 86 for (i = 0; i < byte_num; i++) { 87 val = *(tmp_buf + ESDHC_BOOT_IMAGE_SIZE + i); 88 code_len = (code_len << 8) + val; 89 } 90 code_len -= CONFIG_SYS_MMC_U_BOOT_OFFS; 91 /* 92 * Load U-Boot image from mmc into RAM 93 */ 94 blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len; 95 blk_cnt = ALIGN(code_len, mmc->read_bl_len) / mmc->read_bl_len; 96 err = mmc->block_dev.block_read(0, blk_start, blk_cnt, 97 (uchar *)CONFIG_SYS_MMC_U_BOOT_DST); 98 if (err != blk_cnt) { 99 puts("spl: mmc read failed!!\n"); 100 free(tmp_buf); 101 hang(); 102 } 103 104 /* 105 * Clean d-cache and invalidate i-cache, to 106 * make sure that no stale data is executed. 107 */ 108 flush_cache(CONFIG_SYS_MMC_U_BOOT_DST, CONFIG_SYS_MMC_U_BOOT_SIZE); 109 110 /* 111 * Jump to U-Boot image 112 */ 113 uboot = (void *)CONFIG_SYS_MMC_U_BOOT_START; 114 (*uboot)(); 115 } 116