LXR uboot/board/w7o/fsboot.c

   1/*
   2 * (C) Copyright 2001
   3 * Wave 7 Optics, Inc.
   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
  24#include <common.h>
  25#include <config.h>
  26#include <command.h>
  27
  28/*
  29 * FIXME: Add code to test image and it's header.
  30 */
  31extern int valid_elf_image (unsigned long addr);
  32
  33static int
  34image_check(ulong addr)
  35{
  36    return valid_elf_image(addr);
  37}
  38
  39void
  40init_fsboot(void)
  41{
  42    char  *envp;
  43    ulong loadaddr;
  44    ulong testaddr;
  45    ulong alt_loadaddr;
  46    char buf[9];
  47
  48    /*
  49     * Get test image address
  50     */
  51    if ((envp = getenv("testaddr")) != NULL)
  52        testaddr = simple_strtoul(envp, NULL, 16);
  53    else
  54        testaddr = -1;
  55
  56    /*
  57     * Are we going to test boot and image?
  58     */
  59    if ((testaddr != -1) && image_check(testaddr)) {
  60
  61        /* Set alt_loadaddr */
  62        alt_loadaddr = testaddr;
  63        sprintf(buf, "%lX", alt_loadaddr);
  64        setenv("alt_loadaddr", buf);
  65
  66        /* Clear test_addr */
  67        setenv("testaddr", NULL);
  68
  69        /*
  70         * Save current environment with alt_loadaddr,
  71         * and cleared testaddr.
  72         */
  73        saveenv();
  74
  75        /*
  76         * Setup temporary loadaddr to alt_loadaddr
  77         * XXX - DO NOT SAVE ENVIRONMENT!
  78         */
  79        loadaddr = alt_loadaddr;
  80        sprintf(buf, "%lX", loadaddr);
  81        setenv("loadaddr", buf);
  82
  83    } else { /* Normal boot */
  84        setenv("alt_loadaddr", NULL);           /* Clear alt_loadaddr */
  85        setenv("testaddr", NULL);               /* Clear testaddr */
  86        saveenv();
  87    }
  88
  89    return;
  90}
  91