source: SVN/rincon/u-boot/common/env_nvram.c @ 55

Last change on this file since 55 was 55, checked in by Tim Harvey, 2 years ago

rincon: added latest u-boot source

restored form server backup

Signed-off-by: Tim Harvey <tharvey@…>

File size: 4.0 KB
Line 
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/*
28 * 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de>
29 *
30 * It might not be possible in all cases to use 'memcpy()' to copy
31 * the environment to NVRAM, as the NVRAM might not be mapped into
32 * the memory space. (I.e. this is the case for the BAB750). In those
33 * cases it might be possible to access the NVRAM using a different
34 * method. For example, the RTC on the BAB750 is accessible in IO
35 * space using its address and data registers. To enable usage of
36 * NVRAM in those cases I invented the functions 'nvram_read()' and
37 * 'nvram_write()', which will be activated upon the configuration
38 * #define CFG_NVRAM_ACCESS_ROUTINE. Note, that those functions are
39 * strongly dependent on the used HW, and must be redefined for each
40 * board that wants to use them.
41 */
42
43#include <common.h>
44#include <command.h>
45#include <environment.h>
46#include <linux/stddef.h>
47
48DECLARE_GLOBAL_DATA_PTR;
49
50#ifdef CFG_NVRAM_ACCESS_ROUTINE
51extern void *nvram_read(void *dest, const long src, size_t count);
52extern void nvram_write(long dest, const void *src, size_t count);
53env_t *env_ptr = NULL;
54#else
55env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
56#endif
57
58char * env_name_spec = "NVRAM";
59
60extern uchar default_environment[];
61extern int default_environment_size;
62
63#ifdef CONFIG_AMIGAONEG3SE
64uchar env_get_char_spec (int index)
65{
66#ifdef CFG_NVRAM_ACCESS_ROUTINE
67        uchar c;
68
69        nvram_read(&c, CONFIG_ENV_ADDR+index, 1);
70
71        return c;
72#else
73        uchar retval;
74        enable_nvram();
75        retval = *((uchar *)(gd->env_addr + index));
76        disable_nvram();
77        return retval;
78#endif
79}
80#else
81uchar env_get_char_spec (int index)
82{
83#ifdef CFG_NVRAM_ACCESS_ROUTINE
84        uchar c;
85
86        nvram_read(&c, CONFIG_ENV_ADDR+index, 1);
87
88        return c;
89#else
90        return *((uchar *)(gd->env_addr + index));
91#endif
92}
93#endif
94
95void env_relocate_spec (void)
96{
97#if defined(CFG_NVRAM_ACCESS_ROUTINE)
98        nvram_read(env_ptr, CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
99#else
100        memcpy (env_ptr, (void*)CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
101#endif
102}
103
104int saveenv (void)
105{
106        int rcode = 0;
107#ifdef CONFIG_AMIGAONEG3SE
108        enable_nvram();
109#endif
110#ifdef CFG_NVRAM_ACCESS_ROUTINE
111        nvram_write(CONFIG_ENV_ADDR, env_ptr, CONFIG_ENV_SIZE);
112#else
113        if (memcpy ((char *)CONFIG_ENV_ADDR, env_ptr, CONFIG_ENV_SIZE) == NULL)
114                    rcode = 1 ;
115#endif
116#ifdef CONFIG_AMIGAONEG3SE
117        udelay(10000);
118        disable_nvram();
119#endif
120        return rcode;
121}
122
123
124/************************************************************************
125 * Initialize Environment use
126 *
127 * We are still running from ROM, so data use is limited
128 */
129int env_init (void)
130{
131#ifdef CONFIG_AMIGAONEG3SE
132        enable_nvram();
133#endif
134#if defined(CFG_NVRAM_ACCESS_ROUTINE)
135        ulong crc;
136        uchar data[ENV_SIZE];
137        nvram_read (&crc, CONFIG_ENV_ADDR, sizeof(ulong));
138        nvram_read (data, CONFIG_ENV_ADDR+sizeof(ulong), ENV_SIZE);
139
140        if (crc32(0, data, ENV_SIZE) == crc) {
141                gd->env_addr  = (ulong)CONFIG_ENV_ADDR + sizeof(long);
142#else
143        if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
144                gd->env_addr  = (ulong)&(env_ptr->data);
145#endif
146                gd->env_valid = 1;
147        } else {
148                gd->env_addr  = (ulong)&default_environment[0];
149                gd->env_valid = 0;
150        }
151#ifdef CONFIG_AMIGAONEG3SE
152        disable_nvram();
153#endif
154        return (0);
155}
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