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https://github.com/AsahiLinux/u-boot
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1087a7942c
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>
151 lines
3 KiB
C
151 lines
3 KiB
C
/*
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* Copyright (C) 2017 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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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 <environment.h>
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DECLARE_GLOBAL_DATA_PTR;
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static struct env_driver *env_driver_lookup(enum env_location loc)
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{
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struct env_driver *drv;
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const int n_ents = ll_entry_count(struct env_driver, env_driver);
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struct env_driver *entry;
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drv = ll_entry_start(struct env_driver, env_driver);
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for (entry = drv; entry != drv + n_ents; entry++) {
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if (loc == entry->location)
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return entry;
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}
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/* Not found */
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return NULL;
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}
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static enum env_location env_get_default_location(void)
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{
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if IS_ENABLED(CONFIG_ENV_IS_IN_EEPROM)
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return ENVL_EEPROM;
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else if IS_ENABLED(CONFIG_ENV_IS_IN_FAT)
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return ENVL_FAT;
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else if IS_ENABLED(CONFIG_ENV_IS_IN_EXT4)
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return ENVL_EXT4;
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else if IS_ENABLED(CONFIG_ENV_IS_IN_FLASH)
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return ENVL_FLASH;
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else if IS_ENABLED(CONFIG_ENV_IS_IN_MMC)
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return ENVL_MMC;
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else if IS_ENABLED(CONFIG_ENV_IS_IN_NAND)
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return ENVL_NAND;
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else if IS_ENABLED(CONFIG_ENV_IS_IN_NVRAM)
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return ENVL_NVRAM;
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else if IS_ENABLED(CONFIG_ENV_IS_IN_REMOTE)
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return ENVL_REMOTE;
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else if IS_ENABLED(CONFIG_ENV_IS_IN_SPI_FLASH)
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return ENVL_SPI_FLASH;
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else if IS_ENABLED(CONFIG_ENV_IS_IN_UBI)
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return ENVL_UBI;
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else if IS_ENABLED(CONFIG_ENV_IS_NOWHERE)
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return ENVL_NOWHERE;
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else
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return ENVL_UNKNOWN;
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}
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struct env_driver *env_driver_lookup_default(void)
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{
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enum env_location loc = env_get_default_location();
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struct env_driver *drv;
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drv = env_driver_lookup(loc);
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if (!drv) {
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debug("%s: No environment driver for location %d\n", __func__,
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loc);
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return NULL;
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}
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return drv;
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}
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int env_get_char(int index)
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{
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struct env_driver *drv = env_driver_lookup_default();
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int ret;
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if (gd->env_valid == ENV_INVALID)
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return default_environment[index];
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if (!drv)
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return -ENODEV;
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if (!drv->get_char)
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return *(uchar *)(gd->env_addr + index);
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ret = drv->get_char(index);
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if (ret < 0) {
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debug("%s: Environment failed to load (err=%d)\n",
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__func__, ret);
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}
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return ret;
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}
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int env_load(void)
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{
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struct env_driver *drv = env_driver_lookup_default();
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int ret = 0;
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if (!drv)
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return -ENODEV;
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if (!drv->load)
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return 0;
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ret = drv->load();
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if (ret) {
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debug("%s: Environment failed to load (err=%d)\n", __func__,
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ret);
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return ret;
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}
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return 0;
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}
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int env_save(void)
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{
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struct env_driver *drv = env_driver_lookup_default();
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int ret;
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if (!drv)
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return -ENODEV;
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if (!drv->save)
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return -ENOSYS;
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ret = drv->save();
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if (ret) {
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debug("%s: Environment failed to save (err=%d)\n", __func__,
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ret);
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return ret;
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}
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return 0;
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}
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int env_init(void)
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{
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struct env_driver *drv = env_driver_lookup_default();
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int ret = -ENOENT;
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if (!drv)
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return -ENODEV;
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if (drv->init)
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ret = drv->init();
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if (ret == -ENOENT) {
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gd->env_addr = (ulong)&default_environment[0];
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gd->env_valid = ENV_VALID;
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return 0;
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} else if (ret) {
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debug("%s: Environment failed to init (err=%d)\n", __func__,
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ret);
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return ret;
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}
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return 0;
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}
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