common/env_common.c

   1 /*
   2  * (C) Copyright 2000-2002
   3  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   4  *
   5  * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
   6  * Andreas Heppel <aheppel@sysgo.de>
   7
   8  * See file CREDITS for list of people who contributed to this
   9  * project.
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License as
  13  * published by the Free Software Foundation; either version 2 of
  14  * the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  24  * MA 02111-1307 USA
  25  */
  26
  27 #include <common.h>
  28 #include <command.h>
  29 #include <environment.h>
  30 #include <cmd_nvedit.h>
  31 #include <linux/stddef.h>
  32 #include <malloc.h>
  33
  34 #ifdef CONFIG_SHOW_BOOT_PROGRESS
  35 # include <status_led.h>
  36 # define SHOW_BOOT_PROGRESS(arg)        show_boot_progress(arg)
  37 #else
  38 # define SHOW_BOOT_PROGRESS(arg)
  39 #endif
  40
  41 #undef DEBUG_ENV
  42 #ifdef DEBUG_ENV
  43 #define DEBUGF(fmt,args...) printf(fmt ,##args)
  44 #else
  45 #define DEBUGF(fmt,args...)
  46 #endif
  47
  48 extern env_t *env_ptr;
  49
  50 extern void env_relocate_spec (void);
  51 extern uchar env_get_char_spec(int);
  52
  53 static uchar env_get_char_init (int index);
  54 uchar (*env_get_char)(int) = env_get_char_init;
  55
  56 /************************************************************************
  57  * Default settings to be used when no valid environment is found
  58  */
  59 #define XMK_STR(x)      #x
  60 #define MK_STR(x)       XMK_STR(x)
  61
  62 uchar default_environment[] = {
  63 #ifdef  CONFIG_BOOTARGS
  64         "bootargs="     CONFIG_BOOTARGS                 "\0"
  65 #endif
  66 #ifdef  CONFIG_BOOTCOMMAND
  67         "bootcmd="      CONFIG_BOOTCOMMAND              "\0"
  68 #endif
  69 #ifdef  CONFIG_RAMBOOTCOMMAND
  70         "ramboot="      CONFIG_RAMBOOTCOMMAND           "\0"
  71 #endif
  72 #ifdef  CONFIG_NFSBOOTCOMMAND
  73         "nfsboot="      CONFIG_NFSBOOTCOMMAND           "\0"
  74 #endif
  75 #if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0)
  76         "bootdelay="    MK_STR(CONFIG_BOOTDELAY)        "\0"
  77 #endif
  78 #if defined(CONFIG_BAUDRATE) && (CONFIG_BAUDRATE >= 0)
  79         "baudrate="     MK_STR(CONFIG_BAUDRATE)         "\0"
  80 #endif
  81 #ifdef  CONFIG_LOADS_ECHO
  82         "loads_echo="   MK_STR(CONFIG_LOADS_ECHO)       "\0"
  83 #endif
  84 #ifdef  CONFIG_ETHADDR
  85         "ethaddr="      MK_STR(CONFIG_ETHADDR)          "\0"
  86 #endif
  87 #ifdef  CONFIG_ETH1ADDR
  88         "eth1addr="     MK_STR(CONFIG_ETH1ADDR)         "\0"
  89 #endif
  90 #ifdef  CONFIG_ETH2ADDR
  91         "eth2addr="     MK_STR(CONFIG_ETH2ADDR)         "\0"
  92 #endif
  93 #ifdef  CONFIG_IPADDR
  94         "ipaddr="       MK_STR(CONFIG_IPADDR)           "\0"
  95 #endif
  96 #ifdef  CONFIG_SERVERIP
  97         "serverip="     MK_STR(CONFIG_SERVERIP)         "\0"
  98 #endif
  99 #ifdef  CFG_AUTOLOAD
 100         "autoload="     CFG_AUTOLOAD                    "\0"
 101 #endif
 102 #ifdef  CONFIG_PREBOOT
 103         "preboot="      CONFIG_PREBOOT                  "\0"
 104 #endif
 105 #ifdef  CONFIG_ROOTPATH
 106         "rootpath="     MK_STR(CONFIG_ROOTPATH)         "\0"
 107 #endif
 108 #ifdef  CONFIG_GATEWAYIP
 109         "gatewayip="    MK_STR(CONFIG_GATEWAYIP)        "\0"
 110 #endif
 111 #ifdef  CONFIG_NETMASK
 112         "netmask="      MK_STR(CONFIG_NETMASK)          "\0"
 113 #endif
 114 #ifdef  CONFIG_HOSTNAME
 115         "hostname="     MK_STR(CONFIG_HOSTNAME)         "\0"
 116 #endif
 117 #ifdef  CONFIG_BOOTFILE
 118         "bootfile="     MK_STR(CONFIG_BOOTFILE)         "\0"
 119 #endif
 120 #ifdef  CONFIG_LOADADDR
 121         "loadaddr="     MK_STR(CONFIG_LOADADDR)         "\0"
 122 #endif
 123 #ifdef  CONFIG_CLOCKS_IN_MHZ
 124         "clocks_in_mhz=1\0"
 125 #endif
 126 #ifdef  CONFIG_EXTRA_ENV_SETTINGS
 127         CONFIG_EXTRA_ENV_SETTINGS
 128 #endif
 129         "\0"
 130 };
 131
 132
 133 void env_crc_update (void)
 134 {
 135         env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
 136 }
 137
 138 static uchar env_get_char_init (int index)
 139 {
 140         DECLARE_GLOBAL_DATA_PTR;
 141         uchar c;
 142
 143         /* if crc was bad, use the default environment */
 144         if (gd->env_valid)
 145         {
 146                 c = env_get_char_spec(index);
 147         } else {
 148                 c = default_environment[index];
 149         }
 150
 151         return (c);
 152 }
 153
 154 uchar env_get_char_memory (int index)
 155 {
 156         DECLARE_GLOBAL_DATA_PTR;
 157
 158         if (gd->env_valid) {
 159                 return ( *((uchar *)(gd->env_addr + index)) );
 160         } else {
 161                 return ( default_environment[index] );
 162         }
 163 }
 164
 165 uchar *env_get_addr (int index)
 166 {
 167         DECLARE_GLOBAL_DATA_PTR;
 168
 169         if (gd->env_valid) {
 170                 return ( ((uchar *)(gd->env_addr + index)) );
 171         } else {
 172                 return (&default_environment[index]);
 173         }
 174 }
 175
 176 void env_relocate (void)
 177 {
 178         DECLARE_GLOBAL_DATA_PTR;
 179
 180         DEBUGF ("%s[%d] offset = 0x%lx\n", __FUNCTION__,__LINE__,
 181                 gd->reloc_off);
 182
 183 #ifdef ENV_IS_EMBEDDED
 184         /*
 185          * The environment buffer is embedded with the text segment,
 186          * just relocate the environment pointer
 187          */
 188         env_ptr = (env_t *)((ulong)env_ptr + gd->reloc_off);
 189         DEBUGF ("%s[%d] embedded ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
 190 #else
 191         /*
 192          * We must allocate a buffer for the environment
 193          */
 194         env_ptr = (env_t *)malloc (CFG_ENV_SIZE);
 195         DEBUGF ("%s[%d] malloced ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
 196 #endif
 197
 198         /*
 199          * After relocation to RAM, we can always use the "memory" functions
 200          */
 201         env_get_char = env_get_char_memory;
 202
 203         if (gd->env_valid == 0) {
 204 #if defined(CONFIG_GTH) || defined(CFG_ENV_IS_NOWHERE)  /* Environment not changable */
 205                 puts ("Using default environment\n\n");
 206 #else
 207                 puts ("*** Warning - bad CRC, using default environment\n\n");
 208                 SHOW_BOOT_PROGRESS (-1);
 209 #endif
 210
 211                 if (sizeof(default_environment) > ENV_SIZE)
 212                 {
 213                         puts ("*** Error - default environment is too large\n\n");
 214                         return;
 215                 }
 216
 217                 memset (env_ptr, 0, sizeof(env_t));
 218                 memcpy (env_ptr->data,
 219                         default_environment,
 220                         sizeof(default_environment));
 221 #ifdef CFG_REDUNDAND_ENVIRONMENT
 222                 env_ptr->flags = 0xFF;
 223 #endif
 224                 env_crc_update ();
 225                 gd->env_valid = 1;
 226         }
 227         else {
 228                 env_relocate_spec ();
 229         }
 230         gd->env_addr = (ulong)&(env_ptr->data);
 231 }