u-boot/drivers/mtd/spi/spi_spl_load.c

/*
 * Copyright (C) 2011 OMICRON electronics GmbH
 *
 * based on drivers/mtd/nand/nand_spl_load.c
 *
 * Copyright (C) 2011
 * Heiko Schocher, DENX Software Engineering, hs@denx.de.
 *
 * 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 <spi_flash.h>

/*
 * The main entry for SPI booting. It's necessary that SDRAM is already
 * configured and available since this code loads the main U-Boot image
 * from SPI into SDRAM and starts it from there.
 */
void spi_boot(void)
{
	struct spi_flash *flash;
	void (*uboot)(void) __noreturn;

	/*
	 * Load U-Boot image from SPI flash into RAM
	 */

	flash = spi_flash_probe(CONFIG_SPL_SPI_BUS, CONFIG_SPL_SPI_CS,
				CONFIG_SF_DEFAULT_SPEED, SPI_MODE_3);
	if (!flash) {
		puts("failed.\n");
		hang();
	}

	spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS,
		       CONFIG_SYS_SPI_U_BOOT_SIZE,
		       (void *) CONFIG_SYS_TEXT_BASE);

	/*
	 * Jump to U-Boot image
	 */
	uboot = (void *) CONFIG_SYS_TEXT_BASE;
	(*uboot)();
}