2 * (C) Copyright 2000-2002
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
6 * Andreas Heppel <aheppel@sysgo.de>
8 * See file CREDITS for list of people who contributed to this
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.
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.
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,
28 * 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de>
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.
45 DECLARE_GLOBAL_DATA_PTR;
47 #ifdef CONFIG_ENV_IS_IN_NVRAM /* Environment is in NVRAM */
50 #include <environment.h>
51 #include <linux/stddef.h>
53 #ifdef CFG_NVRAM_ACCESS_ROUTINE
54 extern void *nvram_read(void *dest, const long src, size_t count);
55 extern void nvram_write(long dest, const void *src, size_t count);
56 env_t *env_ptr = NULL;
58 env_t *env_ptr = (env_t *)CFG_ENV_ADDR;
61 char * env_name_spec = "NVRAM";
63 extern uchar default_environment[];
64 extern int default_environment_size;
66 #ifdef CONFIG_AMIGAONEG3SE
67 uchar env_get_char_spec (int index)
69 #ifdef CFG_NVRAM_ACCESS_ROUTINE
72 nvram_read(&c, CFG_ENV_ADDR+index, 1);
78 retval = *((uchar *)(gd->env_addr + index));
84 uchar env_get_char_spec (int index)
86 #ifdef CFG_NVRAM_ACCESS_ROUTINE
89 nvram_read(&c, CFG_ENV_ADDR+index, 1);
93 return *((uchar *)(gd->env_addr + index));
98 void env_relocate_spec (void)
100 #if defined(CFG_NVRAM_ACCESS_ROUTINE)
101 nvram_read(env_ptr, CFG_ENV_ADDR, CFG_ENV_SIZE);
103 memcpy (env_ptr, (void*)CFG_ENV_ADDR, CFG_ENV_SIZE);
110 #ifdef CONFIG_AMIGAONEG3SE
113 #ifdef CFG_NVRAM_ACCESS_ROUTINE
114 nvram_write(CFG_ENV_ADDR, env_ptr, CFG_ENV_SIZE);
116 if (memcpy ((char *)CFG_ENV_ADDR, env_ptr, CFG_ENV_SIZE) == NULL)
119 #ifdef CONFIG_AMIGAONEG3SE
127 /************************************************************************
128 * Initialize Environment use
130 * We are still running from ROM, so data use is limited
134 #ifdef CONFIG_AMIGAONEG3SE
137 #if defined(CFG_NVRAM_ACCESS_ROUTINE)
139 uchar data[ENV_SIZE];
140 nvram_read (&crc, CFG_ENV_ADDR, sizeof(ulong));
141 nvram_read (data, CFG_ENV_ADDR+sizeof(ulong), ENV_SIZE);
143 if (crc32(0, data, ENV_SIZE) == crc) {
144 gd->env_addr = (ulong)CFG_ENV_ADDR + sizeof(long);
146 if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
147 gd->env_addr = (ulong)&(env_ptr->data);
151 gd->env_addr = (ulong)&default_environment[0];
154 #ifdef CONFIG_AMIGAONEG3SE
160 #endif /* CONFIG_ENV_IS_IN_NVRAM */