env_dataflash.c
1.54 KB
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/*
* LowLevel function for DataFlash environment support
* Author : Gilles Gastaldi (Atmel)
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <environment.h>
#include <linux/stddef.h>
#include <dataflash.h>
#include <search.h>
#include <errno.h>
DECLARE_GLOBAL_DATA_PTR;
env_t *env_ptr;
char *env_name_spec = "dataflash";
uchar env_get_char_spec(int index)
{
uchar c;
read_dataflash(CONFIG_ENV_ADDR + index + offsetof(env_t, data),
1, (char *)&c);
return c;
}
void env_relocate_spec(void)
{
ulong crc, new = 0;
unsigned off;
char buf[CONFIG_ENV_SIZE];
/* Read old CRC */
read_dataflash(CONFIG_ENV_ADDR + offsetof(env_t, crc),
sizeof(ulong), (char *)&crc);
/* Read whole environment */
read_dataflash(CONFIG_ENV_ADDR, CONFIG_ENV_SIZE, buf);
/* Calculate the CRC */
off = offsetof(env_t, data);
new = crc32(new, (unsigned char *)(buf + off), ENV_SIZE);
if (crc == new)
env_import(buf, 1);
else
set_default_env("!bad CRC");
}
#ifdef CONFIG_ENV_OFFSET_REDUND
#error No support for redundant environment on dataflash yet!
#endif
int saveenv(void)
{
env_t env_new;
int ret;
ret = env_export(&env_new);
if (ret)
return ret;
return write_dataflash(CONFIG_ENV_ADDR,
(unsigned long)&env_new,
CONFIG_ENV_SIZE);
}
/*
* Initialize environment use
*
* We are still running from ROM, so data use is limited.
* Use a (moderately small) buffer on the stack
*/
int env_init(void)
{
/* use default */
gd->env_addr = (ulong)&default_environment[0];
gd->env_valid = 1;
return 0;
}