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  */
  31 extern int valid_elf_image (unsigned long addr);
  32
  33 static int
  34 image_check(ulong addr)
  35 {
  36     return valid_elf_image(addr);
  37 }
  38
  39 void
  40 init_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 }