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bootloader_start.c
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bootloader_start.c
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/*
* SPDX-FileCopyrightText: 2015-2022 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdbool.h>
#include "esp_log.h"
#include "esp_rom_sys.h"
#include "bootloader_init.h"
#include "bootloader_utility.h"
#include "bootloader_common.h"
#include "bootloader_hooks.h"
static const char *TAG = "boot";
static int select_partition_number(bootloader_state_t *bs);
static int selected_boot_partition(const bootloader_state_t *bs);
/*
* We arrive here after the ROM bootloader finished loading this second stage bootloader from flash.
* The hardware is mostly uninitialized, flash cache is down and the app CPU is in reset.
* We do have a stack, so we can do the initialization in C.
*/
void __attribute__((noreturn)) call_start_cpu0(void)
{
// (0. Call the before-init hook, if available)
if (bootloader_before_init) {
bootloader_before_init();
}
// 1. Hardware initialization
if (bootloader_init() != ESP_OK) {
bootloader_reset();
}
// (1.1 Call the after-init hook, if available)
if (bootloader_after_init) {
bootloader_after_init();
}
#ifdef CONFIG_BOOTLOADER_SKIP_VALIDATE_IN_DEEP_SLEEP
// If this boot is a wake up from the deep sleep then go to the short way,
// try to load the application which worked before deep sleep.
// It skips a lot of checks due to it was done before (while first boot).
bootloader_utility_load_boot_image_from_deep_sleep();
// If it is not successful try to load an application as usual.
#endif
// 2. Select the number of boot partition
bootloader_state_t bs = {0};
int boot_index = select_partition_number(&bs);
if (boot_index == INVALID_INDEX) {
bootloader_reset();
}
// 3. Load the app image for booting
bootloader_utility_load_boot_image(&bs, boot_index);
}
// Select the number of boot partition
static int select_partition_number(bootloader_state_t *bs)
{
// 1. Load partition table
if (!bootloader_utility_load_partition_table(bs)) {
ESP_LOGE(TAG, "load partition table error!");
return INVALID_INDEX;
}
// 2. Select the number of boot partition
return selected_boot_partition(bs);
}
/*
* Selects a boot partition.
* The conditions for switching to another firmware are checked.
*/
static int selected_boot_partition(const bootloader_state_t *bs)
{
int boot_index = bootloader_utility_get_selected_boot_partition(bs);
if (boot_index == INVALID_INDEX) {
return boot_index; // Unrecoverable failure (not due to corrupt ota data or bad partition contents)
}
if (esp_rom_get_reset_reason(0) != RESET_REASON_CORE_DEEP_SLEEP) {
// Factory firmware.
#ifdef CONFIG_BOOTLOADER_FACTORY_RESET
bool reset_level = false;
#if CONFIG_BOOTLOADER_FACTORY_RESET_PIN_HIGH
reset_level = true;
#endif
if (bootloader_common_check_long_hold_gpio_level(CONFIG_BOOTLOADER_NUM_PIN_FACTORY_RESET, CONFIG_BOOTLOADER_HOLD_TIME_GPIO, reset_level) == GPIO_LONG_HOLD) {
ESP_LOGI(TAG, "Detect a condition of the factory reset");
bool ota_data_erase = false;
#ifdef CONFIG_BOOTLOADER_OTA_DATA_ERASE
ota_data_erase = true;
#endif
const char *list_erase = CONFIG_BOOTLOADER_DATA_FACTORY_RESET;
ESP_LOGI(TAG, "Data partitions to erase: %s", list_erase);
if (bootloader_common_erase_part_type_data(list_erase, ota_data_erase) == false) {
ESP_LOGE(TAG, "Not all partitions were erased");
}
#ifdef CONFIG_BOOTLOADER_RESERVE_RTC_MEM
bootloader_common_set_rtc_retain_mem_factory_reset_state();
#endif
return bootloader_utility_get_selected_boot_partition(bs);
}
#endif // CONFIG_BOOTLOADER_FACTORY_RESET
// TEST firmware.
#ifdef CONFIG_BOOTLOADER_APP_TEST
bool app_test_level = false;
#if CONFIG_BOOTLOADER_APP_TEST_PIN_HIGH
app_test_level = true;
#endif
if (bootloader_common_check_long_hold_gpio_level(CONFIG_BOOTLOADER_NUM_PIN_APP_TEST, CONFIG_BOOTLOADER_HOLD_TIME_GPIO, app_test_level) == GPIO_LONG_HOLD) {
ESP_LOGI(TAG, "Detect a boot condition of the test firmware");
if (bs->test.offset != 0) {
boot_index = TEST_APP_INDEX;
return boot_index;
} else {
ESP_LOGE(TAG, "Test firmware is not found in partition table");
return INVALID_INDEX;
}
}
#endif // CONFIG_BOOTLOADER_APP_TEST
// Customer implementation.
// if (gpio_pin_1 == true && ...){
// boot_index = required_boot_partition;
// } ...
}
return boot_index;
}
// Return global reent struct if any newlib functions are linked to bootloader
struct _reent *__getreent(void)
{
return _GLOBAL_REENT;
}