common/spl/spl_nand.c

   1 /*
   2  * Copyright (C) 2011
   3  * Corscience GmbH & Co. KG - Simon Schwarz <schwarz@corscience.de>
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23 #include <common.h>
  24 #include <config.h>
  25 #include <spl.h>
  26 #include <asm/io.h>
  27 #include <nand.h>
  28
  29 int spl_nand_load_image(void)
  30 {
  31         int ret;
  32         struct image_header *header;
  33         int *src __attribute__((unused));
  34         int *dst __attribute__((unused));
  35
  36         debug("spl: nand - using hw ecc\n");
  37         nand_init();
  38
  39         /*use CONFIG_SYS_TEXT_BASE as temporary storage area */
  40         header = (struct image_header *)CONFIG_SYS_TEXT_BASE;
  41 #ifdef CONFIG_SPL_OS_BOOT
  42         if (!spl_start_uboot()) {
  43                 /*
  44                  * load parameter image
  45                  * load to temp position since nand_spl_load_image reads
  46                  * a whole block which is typically larger than
  47                  * CONFIG_CMD_SPL_WRITE_SIZE therefore may overwrite
  48                  * following sections like BSS
  49                  */
  50                 nand_spl_load_image(CONFIG_CMD_SPL_NAND_OFS,
  51                         CONFIG_CMD_SPL_WRITE_SIZE,
  52                         (void *)CONFIG_SYS_TEXT_BASE);
  53                 /* copy to destintion */
  54                 for (dst = (int *)CONFIG_SYS_SPL_ARGS_ADDR,
  55                                 src = (int *)CONFIG_SYS_TEXT_BASE;
  56                                 src < (int *)(CONFIG_SYS_TEXT_BASE +
  57                                 CONFIG_CMD_SPL_WRITE_SIZE);
  58                                 src++, dst++) {
  59                         writel(readl(src), dst);
  60                 }
  61
  62                 /* load linux */
  63                 nand_spl_load_image(CONFIG_SYS_NAND_SPL_KERNEL_OFFS,
  64                         CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
  65                 spl_parse_image_header(header);
  66                 if (header->ih_os == IH_OS_LINUX) {
  67                         /* happy - was a linux */
  68                         nand_spl_load_image(CONFIG_SYS_NAND_SPL_KERNEL_OFFS,
  69                                 spl_image.size, (void *)spl_image.load_addr);
  70                         nand_deselect();
  71                         return 0;
  72                 } else {
  73                         printf("The Expected Linux image was not"
  74                                 "found. Please check your NAND"
  75                                 "configuration.\n");
  76                         printf("Trying to start u-boot now...\n");
  77                 }
  78         }
  79 #endif
  80 #ifdef CONFIG_NAND_ENV_DST
  81         nand_spl_load_image(CONFIG_ENV_OFFSET,
  82                 CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
  83         spl_parse_image_header(header);
  84         nand_spl_load_image(CONFIG_ENV_OFFSET, spl_image.size,
  85                 (void *)spl_image.load_addr);
  86 #ifdef CONFIG_ENV_OFFSET_REDUND
  87         nand_spl_load_image(CONFIG_ENV_OFFSET_REDUND,
  88                 CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
  89         spl_parse_image_header(header);
  90         nand_spl_load_image(CONFIG_ENV_OFFSET_REDUND, spl_image.size,
  91                 (void *)spl_image.load_addr);
  92 #endif
  93 #endif
  94         /* Load u-boot */
  95         ret = nand_spl_load_image(CONFIG_SYS_NAND_U_BOOT_OFFS,
  96                                 CONFIG_SYS_NAND_PAGE_SIZE, (void *)header);
  97         if (ret == 0) {
  98                 spl_parse_image_header(header);
  99                 ret = nand_spl_load_image(CONFIG_SYS_NAND_U_BOOT_OFFS,
 100                                         spl_image.size, (void *)spl_image.load_addr);
 101         }
 102         nand_deselect();
 103         return ret;
 104 }