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 #ifndef CONFIG_FSL_CORENET 33 uchar *tmp_buf; 34 u32 blklen; 35 uchar val; 36 uint i, byte_num; 37 #endif 38 u32 offset, code_len; 39 struct mmc *mmc; 40 41 mmc = find_mmc_device(0); 42 if (!mmc) { 43 puts("spl: mmc device not found!!\n"); 44 hang(); 45 } 46 47 #ifdef CONFIG_FSL_CORENET 48 offset = CONFIG_SYS_MMC_U_BOOT_OFFS; 49 code_len = CONFIG_SYS_MMC_U_BOOT_SIZE; 50 #else 51 blklen = mmc->read_bl_len; 52 tmp_buf = malloc(blklen); 53 if (!tmp_buf) { 54 puts("spl: malloc memory failed!!\n"); 55 hang(); 56 } 57 memset(tmp_buf, 0, blklen); 58 59 /* 60 * Read source addr from sd card 61 */ 62 err = mmc->block_dev.block_read(0, CONFIG_CFG_DATA_SECTOR, 1, tmp_buf); 63 if (err != 1) { 64 puts("spl: mmc read failed!!\n"); 65 free(tmp_buf); 66 hang(); 67 } 68 69 val = *(tmp_buf + MBRDBR_BOOT_SIG_55); 70 if (0x55 != val) { 71 puts("spl: mmc signature is not valid!!\n"); 72 free(tmp_buf); 73 hang(); 74 } 75 val = *(tmp_buf + MBRDBR_BOOT_SIG_AA); 76 if (0xAA != val) { 77 puts("spl: mmc signature is not valid!!\n"); 78 free(tmp_buf); 79 hang(); 80 } 81 82 byte_num = 4; 83 offset = 0; 84 for (i = 0; i < byte_num; i++) { 85 val = *(tmp_buf + ESDHC_BOOT_IMAGE_ADDR + i); 86 offset = (offset << 8) + val; 87 } 88 offset += CONFIG_SYS_MMC_U_BOOT_OFFS; 89 /* Get the code size from offset 0x48 */ 90 byte_num = 4; 91 code_len = 0; 92 for (i = 0; i < byte_num; i++) { 93 val = *(tmp_buf + ESDHC_BOOT_IMAGE_SIZE + i); 94 code_len = (code_len << 8) + val; 95 } 96 code_len -= CONFIG_SYS_MMC_U_BOOT_OFFS; 97 /* 98 * Load U-Boot image from mmc into RAM 99 */ 100 #endif 101 blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len; 102 blk_cnt = ALIGN(code_len, mmc->read_bl_len) / mmc->read_bl_len; 103 err = mmc->block_dev.block_read(0, blk_start, blk_cnt, 104 (uchar *)CONFIG_SYS_MMC_U_BOOT_DST); 105 if (err != blk_cnt) { 106 puts("spl: mmc read failed!!\n"); 107 #ifndef CONFIG_FSL_CORENET 108 free(tmp_buf); 109 #endif 110 hang(); 111 } 112 113 /* 114 * Clean d-cache and invalidate i-cache, to 115 * make sure that no stale data is executed. 116 */ 117 flush_cache(CONFIG_SYS_MMC_U_BOOT_DST, CONFIG_SYS_MMC_U_BOOT_SIZE); 118 119 /* 120 * Jump to U-Boot image 121 */ 122 uboot = (void *)CONFIG_SYS_MMC_U_BOOT_START; 123 (*uboot)(); 124 } 125