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https://github.com/brain-hackers/u-boot-brain
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2166ebf783
For multiple env drivers to correctly implement fallback when one environment fails to load (e.g. crc error), the return value of env_import has to be propagated by all env driver's load function. Without this change, the first driver that succeeds to load an environment with an invalid CRC return 0 (success) and no other drivers are checked. Signed-off-by: Simon Goldschmidt <sgoldschmidt@de.pepperl-fuchs.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
139 lines
3.0 KiB
C
139 lines
3.0 KiB
C
/*
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* (c) Copyright 2011 by Tigris Elektronik GmbH
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*
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* Author:
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* Maximilian Schwerin <mvs@tigris.de>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <command.h>
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#include <environment.h>
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#include <linux/stddef.h>
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#include <malloc.h>
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#include <memalign.h>
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#include <search.h>
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#include <errno.h>
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#include <fat.h>
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#include <mmc.h>
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#ifdef CONFIG_SPL_BUILD
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/* TODO(sjg@chromium.org): Figure out why this is needed */
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# if !defined(CONFIG_TARGET_AM335X_EVM) || defined(CONFIG_SPL_OS_BOOT)
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# define LOADENV
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# endif
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#else
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# define LOADENV
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# if defined(CONFIG_CMD_SAVEENV)
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# define CMD_SAVEENV
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# endif
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#endif
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DECLARE_GLOBAL_DATA_PTR;
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#ifdef CMD_SAVEENV
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static int env_fat_save(void)
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{
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env_t env_new;
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struct blk_desc *dev_desc = NULL;
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disk_partition_t info;
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int dev, part;
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int err;
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loff_t size;
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err = env_export(&env_new);
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if (err)
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return err;
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part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
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CONFIG_ENV_FAT_DEVICE_AND_PART,
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&dev_desc, &info, 1);
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if (part < 0)
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return 1;
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dev = dev_desc->devnum;
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if (fat_set_blk_dev(dev_desc, &info) != 0) {
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/*
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* This printf is embedded in the messages from env_save that
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* will calling it. The missing \n is intentional.
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*/
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printf("Unable to use %s %d:%d... ",
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CONFIG_ENV_FAT_INTERFACE, dev, part);
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return 1;
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}
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err = file_fat_write(CONFIG_ENV_FAT_FILE, (void *)&env_new, 0, sizeof(env_t),
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&size);
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if (err == -1) {
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/*
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* This printf is embedded in the messages from env_save that
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* will calling it. The missing \n is intentional.
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*/
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printf("Unable to write \"%s\" from %s%d:%d... ",
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CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
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return 1;
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}
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return 0;
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}
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#endif /* CMD_SAVEENV */
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#ifdef LOADENV
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static int env_fat_load(void)
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{
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ALLOC_CACHE_ALIGN_BUFFER(char, buf, CONFIG_ENV_SIZE);
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struct blk_desc *dev_desc = NULL;
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disk_partition_t info;
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int dev, part;
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int err;
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part = blk_get_device_part_str(CONFIG_ENV_FAT_INTERFACE,
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CONFIG_ENV_FAT_DEVICE_AND_PART,
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&dev_desc, &info, 1);
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if (part < 0)
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goto err_env_relocate;
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dev = dev_desc->devnum;
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if (fat_set_blk_dev(dev_desc, &info) != 0) {
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/*
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* This printf is embedded in the messages from env_save that
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* will calling it. The missing \n is intentional.
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*/
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printf("Unable to use %s %d:%d... ",
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CONFIG_ENV_FAT_INTERFACE, dev, part);
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goto err_env_relocate;
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}
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err = file_fat_read(CONFIG_ENV_FAT_FILE, buf, CONFIG_ENV_SIZE);
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if (err == -1) {
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/*
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* This printf is embedded in the messages from env_save that
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* will calling it. The missing \n is intentional.
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*/
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printf("Unable to read \"%s\" from %s%d:%d... ",
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CONFIG_ENV_FAT_FILE, CONFIG_ENV_FAT_INTERFACE, dev, part);
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goto err_env_relocate;
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}
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return env_import(buf, 1);
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err_env_relocate:
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set_default_env(NULL);
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return -EIO;
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}
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#endif /* LOADENV */
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U_BOOT_ENV_LOCATION(fat) = {
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.location = ENVL_FAT,
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ENV_NAME("FAT")
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#ifdef LOADENV
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.load = env_fat_load,
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#endif
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#ifdef CMD_SAVEENV
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.save = env_save_ptr(env_fat_save),
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#endif
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};
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