mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-28 15:41:40 +00:00
c595199194
The load() methods have inconsistent behaviour on error. Some of them load an empty default environment. Some load an environment containing an error message. Others do nothing. As a step in the right direction, have the method return an error code. Then the caller could handle this itself in a consistent way. Signed-off-by: Simon Glass <sjg@chromium.org>
75 lines
1.5 KiB
C
75 lines
1.5 KiB
C
/*
|
|
* 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;
|
|
|
|
static int env_dataflash_get_char(int index)
|
|
{
|
|
uchar c;
|
|
|
|
read_dataflash(CONFIG_ENV_ADDR + index + offsetof(env_t, data),
|
|
1, (char *)&c);
|
|
return c;
|
|
}
|
|
|
|
static int env_dataflash_load(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");
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_ENV_OFFSET_REDUND
|
|
#error No support for redundant environment on dataflash yet!
|
|
#endif
|
|
|
|
static int env_dataflash_save(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);
|
|
}
|
|
|
|
U_BOOT_ENV_LOCATION(dataflash) = {
|
|
.location = ENVL_DATAFLASH,
|
|
ENV_NAME("dataflash")
|
|
.get_char = env_dataflash_get_char,
|
|
.load = env_dataflash_load,
|
|
.save = env_save_ptr(env_dataflash_save),
|
|
};
|