2
* (C) Copyright 2000-2010
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
* SPDX-License-Identifier: GPL-2.0+
12
* 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de>
14
* It might not be possible in all cases to use 'memcpy()' to copy
15
* the environment to NVRAM, as the NVRAM might not be mapped into
16
* the memory space. (I.e. this is the case for the BAB750). In those
17
* cases it might be possible to access the NVRAM using a different
18
* method. For example, the RTC on the BAB750 is accessible in IO
19
* space using its address and data registers. To enable usage of
20
* NVRAM in those cases I invented the functions 'nvram_read()' and
21
* 'nvram_write()', which will be activated upon the configuration
22
* #define CONFIG_SYS_NVRAM_ACCESS_ROUTINE. Note, that those functions are
23
* strongly dependent on the used HW, and must be redefined for each
24
* board that wants to use them.
29
#include <environment.h>
30
#include <linux/stddef.h>
34
DECLARE_GLOBAL_DATA_PTR;
36
#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
37
extern void *nvram_read(void *dest, const long src, size_t count);
38
extern void nvram_write(long dest, const void *src, size_t count);
41
env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
44
char *env_name_spec = "NVRAM";
46
#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
47
uchar env_get_char_spec(int index)
51
nvram_read(&c, CONFIG_ENV_ADDR + index, 1);
57
void env_relocate_spec(void)
59
char buf[CONFIG_ENV_SIZE];
61
#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
62
nvram_read(buf, CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
64
memcpy(buf, (void *)CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
74
rcode = env_export(&env_new);
78
#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
79
nvram_write(CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE);
81
if (memcpy((char *)CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE) == NULL)
88
* Initialize Environment use
90
* We are still running from ROM, so data use is limited
94
#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
98
nvram_read(&crc, CONFIG_ENV_ADDR, sizeof(ulong));
99
nvram_read(data, CONFIG_ENV_ADDR + sizeof(ulong), ENV_SIZE);
101
if (crc32(0, data, ENV_SIZE) == crc) {
102
gd->env_addr = (ulong)CONFIG_ENV_ADDR + sizeof(long);
104
if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
105
gd->env_addr = (ulong)&env_ptr->data;
109
gd->env_addr = (ulong)&default_environment[0];