2 * Copyright 2013 Freescale Semiconductor, Inc.
4 * SPDX-License-Identifier: GPL-2.0+
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.
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
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.
28 void __noreturn mmc_boot(void)
30 __attribute__((noreturn)) void (*uboot)(void);
31 uint blk_start, blk_cnt, err;
39 mmc = find_mmc_device(0);
41 puts("spl: mmc device not found!!\n");
45 #ifdef CONFIG_FSL_CORENET
46 offset = CONFIG_SYS_MMC_U_BOOT_OFFS;
47 code_len = CONFIG_SYS_MMC_U_BOOT_SIZE;
49 blklen = mmc->read_bl_len;
50 tmp_buf = malloc(blklen);
52 puts("spl: malloc memory failed!!\n");
55 memset(tmp_buf, 0, blklen);
58 * Read source addr from sd card
60 err = mmc->block_dev.block_read(0, CONFIG_CFG_DATA_SECTOR, 1, tmp_buf);
62 puts("spl: mmc read failed!!\n");
67 val = *(tmp_buf + MBRDBR_BOOT_SIG_55);
69 puts("spl: mmc signature is not valid!!\n");
73 val = *(tmp_buf + MBRDBR_BOOT_SIG_AA);
75 puts("spl: mmc signature is not valid!!\n");
82 for (i = 0; i < byte_num; i++) {
83 val = *(tmp_buf + ESDHC_BOOT_IMAGE_ADDR + i);
84 offset = (offset << 8) + val;
86 offset += CONFIG_SYS_MMC_U_BOOT_OFFS;
87 /* Get the code size from offset 0x48 */
90 for (i = 0; i < byte_num; i++) {
91 val = *(tmp_buf + ESDHC_BOOT_IMAGE_SIZE + i);
92 code_len = (code_len << 8) + val;
94 code_len -= CONFIG_SYS_MMC_U_BOOT_OFFS;
96 * Load U-Boot image from mmc into RAM
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");
110 * Clean d-cache and invalidate i-cache, to
111 * make sure that no stale data is executed.
113 flush_cache(CONFIG_SYS_MMC_U_BOOT_DST, CONFIG_SYS_MMC_U_BOOT_SIZE);
116 * Jump to U-Boot image
118 uboot = (void *)CONFIG_SYS_MMC_U_BOOT_START;