common/spl/spl_nand.c

/*
 * Copyright (C) 2011
 * Corscience GmbH & Co. KG - Simon Schwarz <schwarz@corscience.de>
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * 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 <config.h>
#include <spl.h>
#include <asm/io.h>
#include <nand.h>

void spl_nand_load_image(void)
{
	struct image_header *header;
	int *src __attribute__((unused));
	int *dst __attribute__((unused));

	debug("spl: nand - using hw ecc\n");
	nand_init();

	/*use CONFIG_SYS_TEXT_BASE as temporary storage area */
	header = (struct image_header *)(CONFIG_SYS_TEXT_BASE);
#ifdef CONFIG_SPL_OS_BOOT
	if (!spl_start_uboot()) {
		/*
		 * load parameter image
		 * load to temp position since nand_spl_load_image reads
		 * a whole block which is typically larger than
		 * CONFIG_CMD_SPL_WRITE_SIZE therefore may overwrite
		 * following sections like BSS
		 */
		nand_spl_load_image(CONFIG_CMD_SPL_NAND_OFS,
			CONFIG_CMD_SPL_WRITE_SIZE,
			(void *)CONFIG_SYS_TEXT_BASE);
		/* copy to destintion */
		for (dst = (int *)CONFIG_SYS_SPL_ARGS_ADDR,
				src = (int *)CONFIG_SYS_TEXT_BASE;
				src < (int *)(CONFIG_SYS_TEXT_BASE +
				CONFIG_CMD_SPL_WRITE_SIZE);
				src++, dst++) {
			writel(readl(src), dst);
		}

		/* load linux */
		nand_spl_load_image(CONFIG_SYS_NAND_SPL_KERNEL_OFFS,
			CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
		spl_parse_image_header(header);
		if (header->ih_os == IH_OS_LINUX) {
			/* happy - was a linux */
			nand_spl_load_image(CONFIG_SYS_NAND_SPL_KERNEL_OFFS,
				spl_image.size, (void *)spl_image.load_addr);
			nand_deselect();
			return;
		} else {
			puts("The Expected Linux image was not "
				"found. Please check your NAND "
				"configuration.\n");
			puts("Trying to start u-boot now...\n");
		}
	}
#endif
#ifdef CONFIG_NAND_ENV_DST
	nand_spl_load_image(CONFIG_ENV_OFFSET,
		CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
	spl_parse_image_header(header);
	nand_spl_load_image(CONFIG_ENV_OFFSET, spl_image.size,
		(void *)spl_image.load_addr);
#ifdef CONFIG_ENV_OFFSET_REDUND
	nand_spl_load_image(CONFIG_ENV_OFFSET_REDUND,
		CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
	spl_parse_image_header(header);
	nand_spl_load_image(CONFIG_ENV_OFFSET_REDUND, spl_image.size,
		(void *)spl_image.load_addr);
#endif
#endif
	/* Load u-boot */
	nand_spl_load_image(CONFIG_SYS_NAND_U_BOOT_OFFS,
		CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
	spl_parse_image_header(header);
	nand_spl_load_image(CONFIG_SYS_NAND_U_BOOT_OFFS,
		spl_image.size, (void *)spl_image.load_addr);
	nand_deselect();
}