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wdenk0bc4a1a2002-09-18 11:09:59 +00001/*
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>
wdenk0bc4a1a2002-09-18 11:09:59 +000028#include <command.h>
29#include <environment.h>
wdenk0bc4a1a2002-09-18 11:09:59 +000030#include <linux/stddef.h>
wdenk0bc4a1a2002-09-18 11:09:59 +000031
Wolfgang Denkd87080b2006-03-31 18:32:53 +020032DECLARE_GLOBAL_DATA_PTR;
33
wdenk0bc4a1a2002-09-18 11:09:59 +000034env_t *env_ptr = NULL;
35
36char * env_name_spec = "EEPROM";
37
wdenk0bc4a1a2002-09-18 11:09:59 +000038uchar env_get_char_spec (int index)
39{
40 uchar c;
41
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020042 eeprom_read (CONFIG_SYS_DEF_EEPROM_ADDR,
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +020043 CONFIG_ENV_OFFSET+index+offsetof(env_t,data),
wdenk0bc4a1a2002-09-18 11:09:59 +000044 &c, 1);
45
46 return (c);
47}
48
49void env_relocate_spec (void)
50{
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020051 eeprom_read (CONFIG_SYS_DEF_EEPROM_ADDR,
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +020052 CONFIG_ENV_OFFSET,
wdenk0bc4a1a2002-09-18 11:09:59 +000053 (uchar*)env_ptr,
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +020054 CONFIG_ENV_SIZE);
wdenk0bc4a1a2002-09-18 11:09:59 +000055}
56
57int saveenv(void)
58{
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020059 return eeprom_write (CONFIG_SYS_DEF_EEPROM_ADDR,
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +020060 CONFIG_ENV_OFFSET,
wdenk0bc4a1a2002-09-18 11:09:59 +000061 (uchar *)env_ptr,
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +020062 CONFIG_ENV_SIZE);
wdenk0bc4a1a2002-09-18 11:09:59 +000063}
64
65/************************************************************************
66 * Initialize Environment use
67 *
68 * We are still running from ROM, so data use is limited
69 * Use a (moderately small) buffer on the stack
70 */
71int env_init(void)
72{
wdenk0bc4a1a2002-09-18 11:09:59 +000073 ulong crc, len, new;
74 unsigned off;
75 uchar buf[64];
76
77 eeprom_init (); /* prepare for EEPROM read/write */
78
79 /* read old CRC */
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020080 eeprom_read (CONFIG_SYS_DEF_EEPROM_ADDR,
Jean-Christophe PLAGNIOL-VILLARD0e8d1582008-09-10 22:48:06 +020081 CONFIG_ENV_OFFSET+offsetof(env_t,crc),
wdenk0bc4a1a2002-09-18 11:09:59 +000082 (uchar *)&crc, sizeof(ulong));
83
84 new = 0;
85 len = ENV_SIZE;
86 off = offsetof(env_t,data);
87 while (len > 0) {
88 int n = (len > sizeof(buf)) ? sizeof(buf) : len;
89
Jean-Christophe PLAGNIOL-VILLARD6d0f6bc2008-10-16 15:01:15 +020090 eeprom_read (CONFIG_SYS_DEF_EEPROM_ADDR, CONFIG_ENV_OFFSET+off, buf, n);
wdenk0bc4a1a2002-09-18 11:09:59 +000091 new = crc32 (new, buf, n);
92 len -= n;
93 off += n;
94 }
95
96 if (crc == new) {
97 gd->env_addr = offsetof(env_t,data);
98 gd->env_valid = 1;
99 } else {
100 gd->env_addr = 0;
101 gd->env_valid = 0;
102 }
103
104 return (0);
105}