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/*
* (C) Copyright 2000-2010
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* (C) Copyright 2001 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
* Andreas Heppel <aheppel@sysgo.de>
* SPDX-License-Identifier: GPL-2.0+
*/
/*
* 09-18-2001 Andreas Heppel, Sysgo RTS GmbH <aheppel@sysgo.de>
*
* It might not be possible in all cases to use 'memcpy()' to copy
* the environment to NVRAM, as the NVRAM might not be mapped into
* the memory space. (I.e. this is the case for the BAB750). In those
* cases it might be possible to access the NVRAM using a different
* method. For example, the RTC on the BAB750 is accessible in IO
* space using its address and data registers. To enable usage of
* NVRAM in those cases I invented the functions 'nvram_read()' and
* 'nvram_write()', which will be activated upon the configuration
* #define CONFIG_SYS_NVRAM_ACCESS_ROUTINE. Note, that those functions are
* strongly dependent on the used HW, and must be redefined for each
* board that wants to use them.
*/
#include <common.h>
#include <command.h>
#include <environment.h>
#include <linux/stddef.h>
#include <search.h>
#include <errno.h>
DECLARE_GLOBAL_DATA_PTR;
#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
extern void *nvram_read(void *dest, const long src, size_t count);
extern void nvram_write(long dest, const void *src, size_t count);
#else
env_t *env_ptr = (env_t *)CONFIG_ENV_ADDR;
#endif
#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
/** Call this function from overridden env_get_char_spec() if you need
* this functionality.
*/
int env_nvram_get_char(int index)
{
uchar c;
nvram_read(&c, CONFIG_ENV_ADDR + index, 1);
return c;
}
#endif
static int env_nvram_load(void)
{
char buf[CONFIG_ENV_SIZE];
#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
nvram_read(buf, CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
#else
memcpy(buf, (void *)CONFIG_ENV_ADDR, CONFIG_ENV_SIZE);
#endif
return env_import(buf, 1);
}
static int env_nvram_save(void)
{
env_t env_new;
int rcode = 0;
rcode = env_export(&env_new);
if (rcode)
return rcode;
#ifdef CONFIG_SYS_NVRAM_ACCESS_ROUTINE
nvram_write(CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE);
#else
if (memcpy((char *)CONFIG_ENV_ADDR, &env_new, CONFIG_ENV_SIZE) == NULL)
rcode = 1;
#endif
return rcode;
}
/*
* Initialize Environment use
*
* We are still running from ROM, so data use is limited
*/
static int env_nvram_init(void)
{
#if defined(CONFIG_SYS_NVRAM_ACCESS_ROUTINE)
ulong crc;
uchar data[ENV_SIZE];
nvram_read(&crc, CONFIG_ENV_ADDR, sizeof(ulong));
nvram_read(data, CONFIG_ENV_ADDR + sizeof(ulong), ENV_SIZE);
if (crc32(0, data, ENV_SIZE) == crc) {
gd->env_addr = (ulong)CONFIG_ENV_ADDR + sizeof(long);
#else
if (crc32(0, env_ptr->data, ENV_SIZE) == env_ptr->crc) {
gd->env_addr = (ulong)&env_ptr->data;
#endif
gd->env_valid = ENV_VALID;
} else {
gd->env_addr = (ulong)&default_environment[0];
gd->env_valid = ENV_INVALID;
}
return 0;
}
U_BOOT_ENV_LOCATION(nvram) = {
.location = ENVL_NVRAM,
ENV_NAME("NVRAM")
.load = env_nvram_load,
.save = env_save_ptr(env_nvram_save),
.init = env_nvram_init,
};
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