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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* (C) Copyright 2017 Theobroma Systems Design und Consulting GmbH
*/
#include <dm.h>
#include <env.h>
#include <env_internal.h>
#include <dm/uclass-internal.h>
/*
* Swap mmc0 and mmc1 in boot_targets if booted from SD-Card.
*
* If bootsource is uSD-card we can assume that we want to use the
* SD-Card instead of the eMMC as first boot_target for distroboot.
* We only want to swap the defaults and not any custom environment a
* user has set. We exit early if a changed boot_targets environment
* is detected.
*/
int setup_boottargets(void)
{
const char *boot_device =
ofnode_read_chosen_string("u-boot,spl-boot-device");
char env_default[sizeof(BOOT_TARGETS)];
char *env;
int ret;
if (!boot_device) {
debug("%s: /chosen/u-boot,spl-boot-device not set\n",
__func__);
return -1;
}
debug("%s: booted from %s\n", __func__, boot_device);
ret = env_get_default_into("boot_targets", env_default, sizeof(env_default));
if (ret < 0)
env_default[0] = '\0';
env = env_get("boot_targets");
if (!env) {
debug("%s: boot_targets does not exist\n", __func__);
return -1;
}
debug("%s: boot_targets current: %s - default: %s\n",
__func__, env, env_default);
if (strcmp(env_default, env) != 0) {
debug("%s: boot_targets not default, don't change it\n",
__func__);
return 0;
}
/*
* Make the default boot medium between SD Card and eMMC, the one that
* was used to load U-Boot proper. If SPI-NOR flash was used, keep
* original default order.
*/
struct udevice *devp;
if (uclass_find_device_by_ofnode(UCLASS_MMC, ofnode_path(boot_device), &devp)) {
debug("%s: not reordering boot_targets, bootdev %s != MMC\n",
__func__, boot_device);
return 0;
}
char *mmc0, *mmc1;
mmc0 = strstr(env, "mmc0");
mmc1 = strstr(env, "mmc1");
if (!mmc0 || !mmc1) {
debug("%s: only one mmc boot_target found\n", __func__);
return -1;
}
/*
* If mmc0 comes first in the boot order and U-Boot proper was
* loaded from mmc1, swap mmc0 and mmc1 in the list.
* If mmc1 comes first in the boot order and U-Boot proper was
* loaded from mmc0, swap mmc0 and mmc1 in the list.
*/
if ((mmc0 < mmc1 && devp->seq_ == 1) ||
(mmc0 > mmc1 && devp->seq_ == 0)) {
mmc0[3] = '1';
mmc1[3] = '0';
debug("%s: set boot_targets to: %s\n", __func__, env);
env_set("boot_targets", env);
}
return 0;
}
enum env_location arch_env_get_location(enum env_operation op, int prio)
{
const char *boot_device =
ofnode_read_chosen_string("u-boot,spl-boot-device");
struct udevice *devp;
if (prio > 0)
return ENVL_UNKNOWN;
if (!boot_device) {
debug("%s: /chosen/u-boot,spl-boot-device not set\n",
__func__);
return ENVL_NOWHERE;
}
debug("%s: booted from %s\n", __func__, boot_device);
if (IS_ENABLED(CONFIG_ENV_IS_IN_SPI_FLASH) &&
!uclass_find_device_by_ofnode(UCLASS_SPI_FLASH, ofnode_path(boot_device), &devp))
return ENVL_SPI_FLASH;
if (IS_ENABLED(CONFIG_ENV_IS_IN_MMC) &&
!uclass_find_device_by_ofnode(UCLASS_MMC, ofnode_path(boot_device), &devp))
return ENVL_MMC;
printf("%s: No environment available: booted from %s but U-Boot config does not allow loading environment from it.",
__func__, boot_device);
return ENVL_NOWHERE;
}
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