fat.c
3.08 KB
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/*
* (c) Copyright 2011 by Tigris Elektronik GmbH
*
* Author:
* Maximilian Schwerin <mvs@tigris.de>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <command.h>
#include <environment.h>
#include <linux/stddef.h>
#include <malloc.h>
#include <memalign.h>
#include <search.h>
#include <errno.h>
#include <fat.h>
#include <mmc.h>
#ifdef CONFIG_SPL_BUILD
/* TODO(sjg@chromium.org): Figure out why this is needed */
# if !defined(CONFIG_TARGET_AM335X_EVM) || defined(CONFIG_SPL_OS_BOOT)
# define LOADENV
# endif
#else
# define LOADENV
# if defined(CONFIG_CMD_SAVEENV)
# define CMD_SAVEENV
# endif
#endif
DECLARE_GLOBAL_DATA_PTR;
#ifdef CMD_SAVEENV
static int env_fat_save(void)
{
env_t __aligned(ARCH_DMA_MINALIGN) env_new;
struct blk_desc *dev_desc = NULL;
disk_partition_t info;
int dev, part;
int err;
loff_t size;
err = env_export(&env_new);
if (err)
return err;
part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
CONFIG_ENV_FAT_DEVICE_AND_PART,
&dev_desc, &info, 1);
if (part < 0)
return 1;
dev = dev_desc->devnum;
if (fat_set_blk_dev(dev_desc, &info) != 0) {
/*
* This printf is embedded in the messages from env_save that
* will calling it. The missing \n is intentional.
*/
printf("Unable to use %s %d:%d... ",
CONFIG_ENV_FAT_INTERFACE, dev, part);
return 1;
}
err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t),
&size);
if (err == -1) {
/*
* This printf is embedded in the messages from env_save that
* will calling it. The missing \n is intentional.
*/
printf("Unable to write \"%s\" from %s%d:%d... ",
CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
return 1;
}
return 0;
}
#endif /* CMD_SAVEENV */
#ifdef LOADENV
static int env_fat_load(void)
{
ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
struct blk_desc *dev_desc = NULL;
disk_partition_t info;
int dev, part;
int err;
if (!strcmp(CONFIG_ENV_FAT_INTERFACE, "mmc"))
mmc_initialize(NULL);
part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
CONFIG_ENV_FAT_DEVICE_AND_PART,
&dev_desc, &info, 1);
if (part < 0)
goto err_env_relocate;
dev = dev_desc->devnum;
if (fat_set_blk_dev(dev_desc, &info) != 0) {
/*
* This printf is embedded in the messages from env_save that
* will calling it. The missing \n is intentional.
*/
printf("Unable to use %s %d:%d... ",
CONFIG_ENV_FAT_INTERFACE, dev, part);
goto err_env_relocate;
}
err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE);
if (err == -1) {
/*
* This printf is embedded in the messages from env_save that
* will calling it. The missing \n is intentional.
*/
printf("Unable to read \"%s\" from %s%d:%d... ",
CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
goto err_env_relocate;
}
return env_import(buf, 1);
err_env_relocate:
set_default_env(NULL);
return -EIO;
}
#endif /* LOADENV */
U_BOOT_ENV_LOCATION(fat) = {
.location = ENVL_FAT,
ENV_NAME("FAT")
#ifdef LOADENV
.load = env_fat_load,
#endif
#ifdef CMD_SAVEENV
.save = env_save_ptr(env_fat_save),
#endif
};