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/*
* Copyright 2013 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
*
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
#include <common.h>
#include <mmc.h>
#include <malloc.h>
/*
* The environment variables are written to just after the u-boot image
* on SDCard, so we must read the MBR to get the start address and code
* length of the u-boot image, then calculate the address of the env.
*/
#define ESDHC_BOOT_IMAGE_SIZE 0x48
#define ESDHC_BOOT_IMAGE_ADDR 0x50
#define MBRDBR_BOOT_SIG_55 0x1fe
#define MBRDBR_BOOT_SIG_AA 0x1ff
#define CONFIG_CFG_DATA_SECTOR 0
/*
* The main entry for mmc booting. It's necessary that SDRAM is already
* configured and available since this code loads the main U-Boot image
* from mmc into SDRAM and starts it from there.
*/
void __noreturn mmc_boot(void)
{
__attribute__((noreturn)) void (*uboot)(void);
uint blk_start, blk_cnt, err;
u32 blklen;
uchar *tmp_buf;
uchar val;
uint i, byte_num;
u32 offset, code_len;
struct mmc *mmc;
mmc = find_mmc_device(0);
if (!mmc) {
puts("spl: mmc device not found!!\n");
hang();
}
blklen = mmc->read_bl_len;
tmp_buf = malloc(blklen);
if (!tmp_buf) {
puts("spl: malloc memory failed!!\n");
hang();
}
memset(tmp_buf, 0, blklen);
/*
* Read source addr from sd card
*/
err = mmc->block_dev.block_read(0, CONFIG_CFG_DATA_SECTOR, 1, tmp_buf);
if (err != 1) {
puts("spl: mmc read failed!!\n");
free(tmp_buf);
hang();
}
val = *(tmp_buf + MBRDBR_BOOT_SIG_55);
if (0x55 != val) {
puts("spl: mmc signature is not valid!!\n");
free(tmp_buf);
hang();
}
val = *(tmp_buf + MBRDBR_BOOT_SIG_AA);
if (0xAA != val) {
puts("spl: mmc signature is not valid!!\n");
free(tmp_buf);
hang();
}
byte_num = 4;
offset = 0;
for (i = 0; i < byte_num; i++) {
val = *(tmp_buf + ESDHC_BOOT_IMAGE_ADDR + i);
offset = (offset << 8) + val;
}
offset += CONFIG_SYS_MMC_U_BOOT_OFFS;
/* Get the code size from offset 0x48 */
byte_num = 4;
code_len = 0;
for (i = 0; i < byte_num; i++) {
val = *(tmp_buf + ESDHC_BOOT_IMAGE_SIZE + i);
code_len = (code_len << 8) + val;
}
code_len -= CONFIG_SYS_MMC_U_BOOT_OFFS;
/*
* Load U-Boot image from mmc into RAM
*/
blk_start = ALIGN(offset, mmc->read_bl_len) / mmc->read_bl_len;
blk_cnt = ALIGN(code_len, mmc->read_bl_len) / mmc->read_bl_len;
err = mmc->block_dev.block_read(0, blk_start, blk_cnt,
(uchar *)CONFIG_SYS_MMC_U_BOOT_DST);
if (err != blk_cnt) {
puts("spl: mmc read failed!!\n");
free(tmp_buf);
hang();
}
/*
* Clean d-cache and invalidate i-cache, to
* make sure that no stale data is executed.
*/
flush_cache(CONFIG_SYS_MMC_U_BOOT_DST, CONFIG_SYS_MMC_U_BOOT_SIZE);
/*
* Jump to U-Boot image
*/
uboot = (void *)CONFIG_SYS_MMC_U_BOOT_START;
(*uboot)();
}
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