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: [Select all] [Expand/Collapse]

1. /*
2.  * SPDX-FileCopyrightText: 2015-2021 Espressif Systems (Shanghai) CO LTD
3.  *
4.  * SPDX-License-Identifier: Apache-2.0
5.  */
6. #include <stdbool.h>
7. #include "sdkconfig.h"
8. #include "esp_log.h"
9. #include "bootloader_init.h"
10. #include "bootloader_utility.h"
11. #include "bootloader_common.h"
12.  
13. static const char* TAG = "boot";
14.  
15. static int select_partition_number(bootloader_state_t *bs);
16.  
17. /*
18.  * We arrive here after the ROM bootloader finished loading this second stage bootloader from flash.
19.  * The hardware is mostly uninitialized, flash cache is down and the app CPU is in reset.
20.  * We do have a stack, so we can do the initialization in C.
21.  */
22. void __attribute__((noreturn)) call_start_cpu0(void)
23. {
24.     // 1. Hardware initialization
25.     if (bootloader_init() != ESP_OK) {
26.         bootloader_reset();
27.     }
28.  
29. #ifdef CONFIG_BOOTLOADER_SKIP_VALIDATE_IN_DEEP_SLEEP
30.     // If this boot is a wake up from the deep sleep then go to the short way,
31.     // try to load the application which worked before deep sleep.
32.     // It skips a lot of checks due to it was done before (while first boot).
33.     bootloader_utility_load_boot_image_from_deep_sleep();
34.     // If it is not successful try to load an application as usual.
35. #endif
36.  
37.     // 2. Select the number of boot partition
38.     bootloader_state_t bs = {0};
39.     int boot_index = select_partition_number(&bs);
40.     if (boot_index == INVALID_INDEX) {
41.         bootloader_reset();
42.     }
43.  
44.     // 2.1 Print a custom message!
45.     esp_rom_printf("[%s] %s\n", TAG, CONFIG_EXAMPLE_BOOTLOADER_WELCOME_MESSAGE);
46.  
47.     // 3. Load the app image for booting
48.     bootloader_utility_load_boot_image(&bs, boot_index);
49. }
50.  
51. // Select the number of boot partition
52. static int select_partition_number(bootloader_state_t *bs)
53. {
54.     // 1. Load partition table
55.     if (!bootloader_utility_load_partition_table(bs)) {
56.         ESP_LOGE(TAG, "load partition table error!");
57.         return INVALID_INDEX;
58.     }
59.  
60.     // 2. Select the number of boot partition
61.     return bootloader_utility_get_selected_boot_partition(bs);
62. }
63.  
64. // Return global reent struct if any newlib functions are linked to bootloader
65. struct _reent *__getreent(void)
66. {
67.     return _GLOBAL_REENT;
68. }

GeSHi © Codebox Plus Extension

[ESP_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