common/env_mgdisk.c

   1 /*
   2  * (C) Copyright 2009 mGine co.
   3  * unsik Kim <donari75@gmail.com>
   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 <command.h>
  26 #include <environment.h>
  27 #include <linux/stddef.h>
  28 #include <mg_disk.h>
  29
  30 /* references to names in env_common.c */
  31 extern uchar default_environment[];
  32
  33 char * env_name_spec = "MG_DISK";
  34
  35 env_t *env_ptr = 0;
  36
  37 DECLARE_GLOBAL_DATA_PTR;
  38
  39 uchar env_get_char_spec(int index)
  40 {
  41         return (*((uchar *) (gd->env_addr + index)));
  42 }
  43
  44 void env_relocate_spec(void)
  45 {
  46         unsigned int err;
  47
  48         err = mg_disk_init();
  49         if (err) {
  50                 puts ("*** Warning - mg_disk_init error");
  51                 goto OUT;
  52         }
  53         err = mg_disk_read(CONFIG_ENV_ADDR, (u_char *)env_ptr, CONFIG_ENV_SIZE);
  54         if (err) {
  55                 puts ("*** Warning - mg_disk_read error");
  56                 goto OUT;
  57         }
  58
  59         if (crc32(0, env_ptr->data, ENV_SIZE) != env_ptr->crc) {
  60                 puts ("*** Warning - CRC error");
  61                 goto OUT;
  62         }
  63
  64         return;
  65
  66 OUT:
  67         printf (", using default environment\n\n");
  68         set_default_env();
  69 }
  70
  71 int saveenv(void)
  72 {
  73         unsigned int err;
  74
  75         env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
  76         err = mg_disk_write(CONFIG_ENV_ADDR, (u_char *)env_ptr,
  77                         CONFIG_ENV_SIZE);
  78         if (err)
  79                 puts ("*** Warning - mg_disk_write error\n\n");
  80
  81         return err;
  82 }
  83
  84 int env_init(void)
  85 {
  86         /* use default */
  87         gd->env_addr = (ulong) & default_environment[0];
  88         gd->env_valid = 1;
  89
  90         return 0;
  91 }