u-boot/env/ext4.c
Jorge Ramirez-Ortiz 1087a7942c env: enable accessing the environment in an EXT4 partition
For example to store the environment in a file named "/uboot.env" in MMC
"0", where partition "1" contains the EXT4 filesystem, the following
configs should be added to the board's default config:

  CONFIG_ENV_IS_IN_EXT4=y
  CONFIG_ENV_EXT4_DEVICE_AND_PART="0:1"
  CONFIG_ENV_EXT4_FILE="/uboot.env"
  CONFIG_ENV_EXT4_INTERFACE="mmc"

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
[trini: Fix some line over 80 chars issues]
Signed-off-by: Tom Rini <trini@konsulko.com>
2018-01-15 16:28:57 -05:00

131 lines
2.8 KiB
C

/*
* (c) Copyright 2016 by VRT Technology
*
* Author:
* Stuart Longland <stuartl@vrt.com.au>
*
* Based on FAT environment driver
* (c) Copyright 2011 by Tigris Elektronik GmbH
*
* Author:
* Maximilian Schwerin <mvs@tigris.de>
*
* and EXT4 filesystem implementation
* (C) Copyright 2011 - 2012 Samsung Electronics
* EXT4 filesystem implementation in Uboot by
* Uma Shankar <uma.shankar@samsung.com>
* Manjunatha C Achar <a.manjunatha@samsung.com>
*
* 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 <ext4fs.h>
#include <mmc.h>
DECLARE_GLOBAL_DATA_PTR;
#ifdef CONFIG_CMD_SAVEENV
static int env_ext4_save(void)
{
env_t env_new;
struct blk_desc *dev_desc = NULL;
disk_partition_t info;
int dev, part;
int err;
err = env_export(&env_new);
if (err)
return err;
part = blk_get_device_part_str(CONFIG_ENV_EXT4_INTERFACE,
CONFIG_ENV_EXT4_DEVICE_AND_PART,
&dev_desc, &info, 1);
if (part < 0)
return 1;
dev = dev_desc->devnum;
ext4fs_set_blk_dev(dev_desc, &info);
if (!ext4fs_mount(info.size)) {
printf("\n** Unable to use %s %s for saveenv **\n",
CONFIG_ENV_EXT4_INTERFACE,
CONFIG_ENV_EXT4_DEVICE_AND_PART);
return 1;
}
err = ext4fs_write(CONFIG_ENV_EXT4_FILE, (void *)&env_new,
sizeof(env_t));
ext4fs_close();
if (err == -1) {
printf("\n** Unable to write \"%s\" from %s%d:%d **\n",
CONFIG_ENV_EXT4_FILE, CONFIG_ENV_EXT4_INTERFACE, dev,
part);
return 1;
}
puts("done\n");
return 0;
}
#endif /* CONFIG_CMD_SAVEENV */
static int env_ext4_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;
loff_t off;
part = blk_get_device_part_str(CONFIG_ENV_EXT4_INTERFACE,
CONFIG_ENV_EXT4_DEVICE_AND_PART,
&dev_desc, &info, 1);
if (part < 0)
goto err_env_relocate;
dev = dev_desc->devnum;
ext4fs_set_blk_dev(dev_desc, &info);
if (!ext4fs_mount(info.size)) {
printf("\n** Unable to use %s %s for loading the env **\n",
CONFIG_ENV_EXT4_INTERFACE,
CONFIG_ENV_EXT4_DEVICE_AND_PART);
goto err_env_relocate;
}
err = ext4_read_file(CONFIG_ENV_EXT4_FILE, buf, 0, CONFIG_ENV_SIZE,
&off);
ext4fs_close();
if (err == -1) {
printf("\n** Unable to read \"%s\" from %s%d:%d **\n",
CONFIG_ENV_EXT4_FILE, CONFIG_ENV_EXT4_INTERFACE, dev,
part);
goto err_env_relocate;
}
env_import(buf, 1);
return 0;
err_env_relocate:
set_default_env(NULL);
return -EIO;
}
U_BOOT_ENV_LOCATION(ext4) = {
.location = ENVL_EXT4,
ENV_NAME("EXT4")
.load = env_ext4_load,
.save = env_save_ptr(env_ext4_save),
};