OVMS3-idf/components/bootloader/subproject/main/bootloader_start.c

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// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
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// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <string.h>
#include <stdint.h>
#include <stdbool.h>
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#include "esp_log.h"
#include "rom/gpio.h"
#include "bootloader_config.h"
#include "bootloader_init.h"
#include "bootloader_utility.h"
#include "bootloader_common.h"
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#include "sdkconfig.h"
#include "esp_image_format.h"
static const char* TAG = "boot";
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static esp_err_t select_image (esp_image_metadata_t *image_data);
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 call_start_cpu0()
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{
// 1. Hardware initialization
if(bootloader_init() != ESP_OK){
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return;
}
// 2. Select image to boot
esp_image_metadata_t image_data;
if(select_image(&image_data) != ESP_OK){
return;
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}
// 3. Loading the selected image
bootloader_utility_load_image(&image_data);
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}
// Selects image to boot
static esp_err_t select_image (esp_image_metadata_t *image_data)
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{
// 1. Load partition table
bootloader_state_t bs = { 0 };
if (!bootloader_utility_load_partition_table(&bs)) {
ESP_LOGE(TAG, "load partition table error!");
return ESP_FAIL;
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}
// 2. Select boot partition
int boot_index = selected_boot_partition(&bs);
if(boot_index == INVALID_INDEX) {
return ESP_FAIL; // Unrecoverable failure (not due to corrupt ota data or bad partition contents)
}
// 3. Load the app image for booting
if (!bootloader_utility_load_boot_image(&bs, boot_index, image_data)) {
return ESP_FAIL;
}
return ESP_OK;
}
/*
* 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)
} else {
// Check for reset to the factory firmware or for launch OTA[x] firmware.
// Customer implementation.
// if (gpio_pin_1 == true && ...){
// boot_index = required_boot_partition;
// } ...
}
return boot_index;
}