mirror of
https://github.com/AsahiLinux/u-boot
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105 lines
2.5 KiB
C
105 lines
2.5 KiB
C
/*
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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 <linux/stddef.h>
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DECLARE_GLOBAL_DATA_PTR;
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env_t *env_ptr = NULL;
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char * env_name_spec = "EEPROM";
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uchar env_get_char_spec (int index)
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{
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uchar c;
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eeprom_read (CONFIG_SYS_DEF_EEPROM_ADDR,
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CONFIG_ENV_OFFSET+index+offsetof(env_t,data),
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&c, 1);
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return (c);
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}
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void env_relocate_spec (void)
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{
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eeprom_read (CONFIG_SYS_DEF_EEPROM_ADDR,
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CONFIG_ENV_OFFSET,
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(uchar*)env_ptr,
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CONFIG_ENV_SIZE);
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}
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int saveenv(void)
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{
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return eeprom_write (CONFIG_SYS_DEF_EEPROM_ADDR,
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CONFIG_ENV_OFFSET,
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(uchar *)env_ptr,
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CONFIG_ENV_SIZE);
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}
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/************************************************************************
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* Initialize Environment use
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*
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* We are still running from ROM, so data use is limited
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* Use a (moderately small) buffer on the stack
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*/
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int env_init(void)
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{
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ulong crc, len, new;
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unsigned off;
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uchar buf[64];
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eeprom_init (); /* prepare for EEPROM read/write */
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/* read old CRC */
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eeprom_read (CONFIG_SYS_DEF_EEPROM_ADDR,
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CONFIG_ENV_OFFSET+offsetof(env_t,crc),
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(uchar *)&crc, sizeof(ulong));
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new = 0;
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len = ENV_SIZE;
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off = offsetof(env_t,data);
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while (len > 0) {
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int n = (len > sizeof(buf)) ? sizeof(buf) : len;
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eeprom_read (CONFIG_SYS_DEF_EEPROM_ADDR, CONFIG_ENV_OFFSET+off, buf, n);
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new = crc32 (new, buf, n);
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len -= n;
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off += n;
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}
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if (crc == new) {
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gd->env_addr = offsetof(env_t,data);
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gd->env_valid = 1;
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} else {
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gd->env_addr = 0;
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gd->env_valid = 0;
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}
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return (0);
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}
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