drivers/mtd/spi/spi_spl_load.c

   1 /*
   2  * Copyright (C) 2011 OMICRON electronics GmbH
   3  *
   4  * based on drivers/mtd/nand/nand_spl_load.c
   5  *
   6  * Copyright (C) 2011
   7  * Heiko Schocher, DENX Software Engineering, hs@denx.de.
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License as
  11  * published by the Free Software Foundation; either version 2 of
  12  * the License, or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  22  * MA 02111-1307 USA
  23  */
  24
  25 #include <common.h>
  26 #include <spi_flash.h>
  27
  28 /*
  29  * The main entry for SPI booting. It's necessary that SDRAM is already
  30  * configured and available since this code loads the main U-Boot image
  31  * from SPI into SDRAM and starts it from there.
  32  */
  33 void spi_boot(void)
  34 {
  35         struct spi_flash *flash;
  36         void (*uboot)(void) __noreturn;
  37
  38         /*
  39          * Load U-Boot image from SPI flash into RAM
  40          */
  41
  42         flash = spi_flash_probe(CONFIG_SPL_SPI_BUS, CONFIG_SPL_SPI_CS,
  43                                 CONFIG_SF_DEFAULT_SPEED, SPI_MODE_3);
  44         if (!flash) {
  45                 puts("failed.\n");
  46                 hang();
  47         }
  48
  49         spi_flash_read(flash, CONFIG_SYS_SPI_U_BOOT_OFFS,
  50                        CONFIG_SYS_SPI_U_BOOT_SIZE,
  51                        (void *) CONFIG_SYS_TEXT_BASE);
  52
  53         /*
  54          * Jump to U-Boot image
  55          */
  56         uboot = (void *) CONFIG_SYS_TEXT_BASE;
  57         (*uboot)();
  58 }