custom bootloader example error when I try to change index

[davidos]

I am using the example custom bootloader (custombootloader_override) in the IDF examples , I have OTA in my app , I am trying to find the simplest way to change from the OTA to factory within the bootloader (if a user keeps a button pressed), I need this in case there is an error in my code in the OTA - which prevents further updates.
I do not have the expertise to mess around with partition tables etc..

here is the code from the examples...how do I change the index so it points to factory if I keep a gpio/button pressed otherwise boot as normal (from either of the 2 OTA partitions)

Many thanks in advance for your help!!

Code: Untitled.c Select all

/*

 * SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD

 *

 * SPDX-License-Identifier: Apache-2.0

 */

#include <stdbool.h>

#include "sdkconfig.h"

#include "esp_log.h"

#include "bootloader_init.h"

#include "bootloader_utility.h"

#include "bootloader_common.h"



static const char* TAG = "boot";



static int select_partition_number(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)

{

    // 1. Hardware initialization

    if (bootloader_init() != ESP_OK) {

        bootloader_reset();

    }



#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();

    }



    // 2.1 Print a custom message!

    esp_rom_printf("[%s] %s\n", TAG, CONFIG_EXAMPLE_BOOTLOADER_WELCOME_MESSAGE);



    // 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 bootloader_utility_get_selected_boot_partition(bs);

}



// Return global reent struct if any newlib functions are linked to bootloader

struct _reent *__getreent(void)

{

    return _GLOBAL_REENT;

}

[Mahavir]

Simplest option here is to erase the "otadata" partition, and that shall let the boot-up fallback to the factory partition. Please refer to this guide: https://docs.espressif.com/projects/esp ... tory-reset