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https://github.com/AsahiLinux/u-boot
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Initial revision
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wdenk
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231
common/env_common.c
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231
common/env_common.c
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/*
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* (C) Copyright 2000-2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
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* Andreas Heppel <aheppel@sysgo.de>
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <command.h>
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#include <environment.h>
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#include <cmd_nvedit.h>
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#include <linux/stddef.h>
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#include <malloc.h>
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#ifdef CONFIG_SHOW_BOOT_PROGRESS
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# include <status_led.h>
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# define SHOW_BOOT_PROGRESS(arg) show_boot_progress(arg)
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#else
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# define SHOW_BOOT_PROGRESS(arg)
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#endif
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#undef DEBUG_ENV
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#ifdef DEBUG_ENV
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#define DEBUGF(fmt,args...) printf(fmt ,##args)
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#else
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#define DEBUGF(fmt,args...)
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#endif
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extern env_t *env_ptr;
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extern void env_relocate_spec (void);
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extern uchar env_get_char_spec(int);
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static uchar env_get_char_init (int index);
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uchar (*env_get_char)(int) = env_get_char_init;
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/************************************************************************
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* Default settings to be used when no valid environment is found
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*/
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#define XMK_STR(x) #x
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#define MK_STR(x) XMK_STR(x)
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uchar default_environment[] = {
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#ifdef CONFIG_BOOTARGS
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"bootargs=" CONFIG_BOOTARGS "\0"
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#endif
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#ifdef CONFIG_BOOTCOMMAND
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"bootcmd=" CONFIG_BOOTCOMMAND "\0"
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#endif
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#ifdef CONFIG_RAMBOOTCOMMAND
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"ramboot=" CONFIG_RAMBOOTCOMMAND "\0"
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#endif
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#ifdef CONFIG_NFSBOOTCOMMAND
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"nfsboot=" CONFIG_NFSBOOTCOMMAND "\0"
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#endif
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#if defined(CONFIG_BOOTDELAY) && (CONFIG_BOOTDELAY >= 0)
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"bootdelay=" MK_STR(CONFIG_BOOTDELAY) "\0"
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#endif
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#if defined(CONFIG_BAUDRATE) && (CONFIG_BAUDRATE >= 0)
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"baudrate=" MK_STR(CONFIG_BAUDRATE) "\0"
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#endif
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#ifdef CONFIG_LOADS_ECHO
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"loads_echo=" MK_STR(CONFIG_LOADS_ECHO) "\0"
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#endif
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#ifdef CONFIG_ETHADDR
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"ethaddr=" MK_STR(CONFIG_ETHADDR) "\0"
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#endif
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#ifdef CONFIG_ETH1ADDR
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"eth1addr=" MK_STR(CONFIG_ETH1ADDR) "\0"
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#endif
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#ifdef CONFIG_ETH2ADDR
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"eth2addr=" MK_STR(CONFIG_ETH2ADDR) "\0"
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#endif
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#ifdef CONFIG_IPADDR
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"ipaddr=" MK_STR(CONFIG_IPADDR) "\0"
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#endif
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#ifdef CONFIG_SERVERIP
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"serverip=" MK_STR(CONFIG_SERVERIP) "\0"
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#endif
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#ifdef CFG_AUTOLOAD
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"autoload=" CFG_AUTOLOAD "\0"
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#endif
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#ifdef CONFIG_PREBOOT
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"preboot=" CONFIG_PREBOOT "\0"
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#endif
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#ifdef CONFIG_ROOTPATH
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"rootpath=" MK_STR(CONFIG_ROOTPATH) "\0"
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#endif
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#ifdef CONFIG_GATEWAYIP
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"gatewayip=" MK_STR(CONFIG_GATEWAYIP) "\0"
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#endif
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#ifdef CONFIG_NETMASK
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"netmask=" MK_STR(CONFIG_NETMASK) "\0"
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#endif
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#ifdef CONFIG_HOSTNAME
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"hostname=" MK_STR(CONFIG_HOSTNAME) "\0"
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#endif
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#ifdef CONFIG_BOOTFILE
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"bootfile=" MK_STR(CONFIG_BOOTFILE) "\0"
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#endif
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#ifdef CONFIG_LOADADDR
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"loadaddr=" MK_STR(CONFIG_LOADADDR) "\0"
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#endif
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#ifdef CONFIG_CLOCKS_IN_MHZ
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"clocks_in_mhz=1\0"
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#endif
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#ifdef CONFIG_EXTRA_ENV_SETTINGS
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CONFIG_EXTRA_ENV_SETTINGS
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#endif
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"\0"
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};
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void env_crc_update (void)
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{
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env_ptr->crc = crc32(0, env_ptr->data, ENV_SIZE);
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}
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static uchar env_get_char_init (int index)
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{
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DECLARE_GLOBAL_DATA_PTR;
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uchar c;
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/* if crc was bad, use the default environment */
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if (gd->env_valid)
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{
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c = env_get_char_spec(index);
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} else {
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c = default_environment[index];
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}
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return (c);
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}
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uchar env_get_char_memory (int index)
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{
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DECLARE_GLOBAL_DATA_PTR;
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if (gd->env_valid) {
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return ( *((uchar *)(gd->env_addr + index)) );
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} else {
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return ( default_environment[index] );
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}
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}
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uchar *env_get_addr (int index)
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{
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DECLARE_GLOBAL_DATA_PTR;
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if (gd->env_valid) {
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return ( ((uchar *)(gd->env_addr + index)) );
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} else {
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return (&default_environment[index]);
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}
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}
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void env_relocate (void)
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{
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DECLARE_GLOBAL_DATA_PTR;
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DEBUGF ("%s[%d] offset = 0x%lx\n", __FUNCTION__,__LINE__,
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gd->reloc_off);
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#ifdef ENV_IS_EMBEDDED
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/*
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* The environment buffer is embedded with the text segment,
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* just relocate the environment pointer
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*/
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env_ptr = (env_t *)((ulong)env_ptr + gd->reloc_off);
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DEBUGF ("%s[%d] embedded ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
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#else
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/*
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* We must allocate a buffer for the environment
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*/
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env_ptr = (env_t *)malloc (CFG_ENV_SIZE);
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DEBUGF ("%s[%d] malloced ENV at %p\n", __FUNCTION__,__LINE__,env_ptr);
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#endif
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/*
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* After relocation to RAM, we can always use the "memory" functions
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*/
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env_get_char = env_get_char_memory;
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if (gd->env_valid == 0) {
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#if defined(CONFIG_GTH) || defined(CFG_ENV_IS_NOWHERE) /* Environment not changable */
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puts ("Using default environment\n\n");
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#else
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puts ("*** Warning - bad CRC, using default environment\n\n");
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SHOW_BOOT_PROGRESS (-1);
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#endif
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if (sizeof(default_environment) > ENV_SIZE)
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{
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puts ("*** Error - default environment is too large\n\n");
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return;
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}
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memset (env_ptr, 0, sizeof(env_t));
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memcpy (env_ptr->data,
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default_environment,
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sizeof(default_environment));
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#ifdef CFG_REDUNDAND_ENVIRONMENT
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env_ptr->flags = 0xFF;
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#endif
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env_crc_update ();
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gd->env_valid = 1;
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}
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else {
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env_relocate_spec ();
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}
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gd->env_addr = (ulong)&(env_ptr->data);
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}
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