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 #ifdef CONFIG_FSL_CORENET 46 offset = CONFIG_SYS_MMC_U_BOOT_OFFS; 47 code_len = CONFIG_SYS_MMC_U_BOOT_SIZE; 48 #else 49 blklen = mmc->read_bl_len; 50 tmp_buf = malloc(blklen); 51 if (!tmp_buf) { 52 puts("spl: malloc memory failed!!\n"); 53 hang(); 54 } 55 memset(tmp_buf, 0, blklen); 56 57 /* 58 * Read source addr from sd card 59 */ 60 err = mmc->block_dev.block_read(0, CONFIG_CFG_DATA_SECTOR, 1, tmp_buf); 61 if (err != 1) { 62 puts("spl: mmc read failed!!\n"); 63 free(tmp_buf); 64 hang(); 65 } 66 67 val = *(tmp_buf + MBRDBR_BOOT_SIG_55); 68 if (0x55 != val) { 69 puts("spl: mmc signature is not valid!!\n"); 70 free(tmp_buf); 71 hang(); 72 } 73 val = *(tmp_buf + MBRDBR_BOOT_SIG_AA); 74 if (0xAA != val) { 75 puts("spl: mmc signature is not valid!!\n"); 76 free(tmp_buf); 77 hang(); 78 } 79 80 byte_num = 4; 81 offset = 0; 82 for (i = 0; i < byte_num; i++) { 83 val = *(tmp_buf + ESDHC_BOOT_IMAGE_ADDR + i); 84 offset = (offset << 8) + val; 85 } 86 offset += CONFIG_SYS_MMC_U_BOOT_OFFS; 87 /* Get the code size from offset 0x48 */ 88 byte_num = 4; 89 code_len = 0; 90 for (i = 0; i < byte_num; i++) { 91 val = *(tmp_buf + ESDHC_BOOT_IMAGE_SIZE + i); 92 code_len = (code_len << 8) + val; 93 } 94 code_len -= CONFIG_SYS_MMC_U_BOOT_OFFS; 95 /* 96 * Load U-Boot image from mmc into RAM 97 */ 98 #endif 99 blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len; 100 blk_cnt = ALIGN(code_len, mmc->read_bl_len) / mmc->read_bl_len; 101 err = mmc->block_dev.block_read(0, blk_start, blk_cnt, 102 (uchar *)CONFIG_SYS_MMC_U_BOOT_DST); 103 if (err != blk_cnt) { 104 puts("spl: mmc read failed!!\n"); 105 free(tmp_buf); 106 hang(); 107 } 108 109 /* 110 * Clean d-cache and invalidate i-cache, to 111 * make sure that no stale data is executed. 112 */ 113 flush_cache(CONFIG_SYS_MMC_U_BOOT_DST, CONFIG_SYS_MMC_U_BOOT_SIZE); 114 115 /* 116 * Jump to U-Boot image 117 */ 118 uboot = (void *)CONFIG_SYS_MMC_U_BOOT_START; 119 (*uboot)(); 120 } 121