mirror of
https://source.denx.de/u-boot/u-boot.git
synced 2025-11-03 01:41:44 +01:00
890feecaab
Add another custom environment flag which discerns environment coming from external storage from environment set by U-Boot itself. Signed-off-by: Marek Vasut <marex@denx.de> Reviewed-by: Tom Rini <trini@konsulko.com>
124 lines
3.1 KiB
C
124 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (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>
|
|
*/
|
|
|
|
/*
|
|
* 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 <env.h>
|
|
#include <env_internal.h>
|
|
#include <linux/stddef.h>
|
|
#include <search.h>
|
|
#include <errno.h>
|
|
#include <u-boot/crc.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
|
|
static 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, H_EXTERNAL);
|
|
}
|
|
|
|
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,
|
|
};
|