LXR uboot/common/env

   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 */
  31extern uchar default_environment[];
  32
  33char * env_name_spec = "MG_DISK";
  34
  35env_t *env_ptr = 0;
  36
  37DECLARE_GLOBAL_DATA_PTR;
  38
  39uchar env_get_char_spec(int index)
  40{
  41        return (*((uchar *) (gd->env_addr + index)));
  42}
  43
  44void 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
  66OUT:
  67        printf (", using default environment\n\n");
  68        set_default_env();
  69}
  70
  71int 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
  84int 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}
  92