mirror of
https://github.com/u-boot/u-boot.git
synced 2024-12-01 08:33:31 +08:00
115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
/*
|
|
* (C) Copyright 2000-2002
|
|
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
|
|
*
|
|
* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
|
|
* Andreas Heppel <aheppel@sysgo.de>
|
|
|
|
* See file CREDITS for list of people who contributed to this
|
|
* project.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License as
|
|
* published by the Free Software Foundation; either version 2 of
|
|
* the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|
* MA 02111-1307 USA
|
|
*/
|
|
|
|
#include <common.h>
|
|
|
|
#if defined(CFG_ENV_IS_IN_EEPROM) /* Environment is in EEPROM */
|
|
|
|
#include <command.h>
|
|
#include <environment.h>
|
|
#include <linux/stddef.h>
|
|
|
|
env_t *env_ptr = NULL;
|
|
|
|
char * env_name_spec = "EEPROM";
|
|
|
|
extern uchar (*env_get_char)(int);
|
|
extern uchar env_get_char_memory (int index);
|
|
|
|
|
|
uchar env_get_char_spec (int index)
|
|
{
|
|
uchar c;
|
|
|
|
eeprom_read (CFG_DEF_EEPROM_ADDR,
|
|
CFG_ENV_OFFSET+index+offsetof(env_t,data),
|
|
&c, 1);
|
|
|
|
return (c);
|
|
}
|
|
|
|
void env_relocate_spec (void)
|
|
{
|
|
eeprom_read (CFG_DEF_EEPROM_ADDR,
|
|
CFG_ENV_OFFSET,
|
|
(uchar*)env_ptr,
|
|
CFG_ENV_SIZE);
|
|
}
|
|
|
|
int saveenv(void)
|
|
{
|
|
return eeprom_write (CFG_DEF_EEPROM_ADDR,
|
|
CFG_ENV_OFFSET,
|
|
(uchar *)env_ptr,
|
|
CFG_ENV_SIZE);
|
|
}
|
|
|
|
/************************************************************************
|
|
* Initialize Environment use
|
|
*
|
|
* We are still running from ROM, so data use is limited
|
|
* Use a (moderately small) buffer on the stack
|
|
*/
|
|
int env_init(void)
|
|
{
|
|
DECLARE_GLOBAL_DATA_PTR;
|
|
|
|
ulong crc, len, new;
|
|
unsigned off;
|
|
uchar buf[64];
|
|
|
|
eeprom_init (); /* prepare for EEPROM read/write */
|
|
|
|
/* read old CRC */
|
|
eeprom_read (CFG_DEF_EEPROM_ADDR,
|
|
CFG_ENV_OFFSET+offsetof(env_t,crc),
|
|
(uchar *)&crc, sizeof(ulong));
|
|
|
|
new = 0;
|
|
len = ENV_SIZE;
|
|
off = offsetof(env_t,data);
|
|
while (len > 0) {
|
|
int n = (len > sizeof(buf)) ? sizeof(buf) : len;
|
|
|
|
eeprom_read (CFG_DEF_EEPROM_ADDR, CFG_ENV_OFFSET+off, buf, n);
|
|
new = crc32 (new, buf, n);
|
|
len -= n;
|
|
off += n;
|
|
}
|
|
|
|
if (crc == new) {
|
|
gd->env_addr = offsetof(env_t,data);
|
|
gd->env_valid = 1;
|
|
} else {
|
|
gd->env_addr = 0;
|
|
gd->env_valid = 0;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
#endif /* CFG_ENV_IS_IN_EEPROM */
|