ESP32 Forum

Posted: **Wed May 29, 2024 11:35 am**

Hello Everyone,

i am trying to copy a binary image located on a data fat partition to an app partition to set the boot from the app partition.
My Idea is to allocate a buffer and read and write the image in loop. Unfortunately is the copied image invalid and i keep getting these log messages:
E (3024) esp_image: image at 0x110000 has invalid magic byte (nothing flashed here?)
E (3034) example_main: Failed to set boot partition to OTA_0: ESP_ERR_OTA_VALIDATE_FAILED

Here is the code:

Code: [Select all] [Expand/Collapse]

 void copy_image_to_ota0() {
    const esp_partition_t *storage_partition = esp_partition_find_first(ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_DATA_FAT, "storage");
    if (!storage_partition) {
        ESP_LOGE(TAG, "Storage partition not found");
        return;
    }
 
    const esp_partition_t *ota_0_partition = esp_partition_find_first(ESP_PARTITION_TYPE_APP, ESP_PARTITION_SUBTYPE_APP_OTA_0, NULL);
    if (!ota_0_partition) {
        ESP_LOGE(TAG, "OTA_0 partition not found");
        return;
    }
 
    if (storage_partition->size > ota_0_partition->size) {
        ESP_LOGE(TAG, "Storage partition is larger than OTA_0 partition");
        return;
    }
 
    ESP_LOGI(TAG, "Copying image from storage to OTA_0 partition");
    const int BUFFER_SIZE = 4096;
    void *buffer = malloc(BUFFER_SIZE);
    if (!buffer) {
        ESP_LOGE(TAG, "Failed to allocate memory for buffer");
        return;
    }
 
    size_t offset = 0;
    esp_err_t err;
    while (offset < storage_partition->size) {
        size_t bytes_to_copy = MIN(BUFFER_SIZE, storage_partition->size - offset);
        
        err = esp_partition_read(storage_partition, offset, buffer, bytes_to_copy);
        if (err != ESP_OK) {
            ESP_LOGE(TAG, "Failed to read from storage partition at offset 0x%08x: %s", offset, esp_err_to_name(err));
            free(buffer);
            return;
        }
 
        err = esp_partition_write(ota_0_partition, offset, buffer, bytes_to_copy);
        if (err != ESP_OK) {
            ESP_LOGE(TAG, "Failed to write to OTA_0 partition at offset 0x%08x: %s", offset, esp_err_to_name(err));
            free(buffer);
            return;
        }
 
        ESP_LOGD(TAG, "Copied %d bytes from offset 0x%08x", bytes_to_copy, offset);
        offset += bytes_to_copy;
    }
 
    ESP_LOGI(TAG, "Image copied successfully to OTA_0 partition");
    free(buffer);
}

GeSHi © Codebox Plus Extension

Posted: **Wed May 29, 2024 3:19 pm**

You can try this edited version of your code:

Code: Select all

#include "esp_partition.h"
#include "esp_log.h"
#include "esp_ota_ops.h"
#include <stdlib.h>

#define TAG "example_main"

void copy_image_to_ota0() {
    const esp_partition_t *storage_partition = esp_partition_find_first(ESP_PARTITION_TYPE_DATA, ESP_PARTITION_SUBTYPE_DATA_FAT, "storage");
    if (!storage_partition) {
        ESP_LOGE(TAG, "Storage partition not found");
        return;
    }

    const esp_partition_t *ota_0_partition = esp_partition_find_first(ESP_PARTITION_TYPE_APP, ESP_PARTITION_SUBTYPE_APP_OTA_0, NULL);
    if (!ota_0_partition) {
        ESP_LOGE(TAG, "OTA_0 partition not found");
        return;
    }

    if (storage_partition->size > ota_0_partition->size) {
        ESP_LOGE(TAG, "Storage partition is larger than OTA_0 partition");
        return;
    }

    ESP_LOGI(TAG, "Copying image from storage to OTA_0 partition");
    const int BUFFER_SIZE = 4096;
    void *buffer = malloc(BUFFER_SIZE);
    if (!buffer) {
        ESP_LOGE(TAG, "Failed to allocate memory for buffer");
        return;
    }

    size_t offset = 0

Posted: **Wed May 29, 2024 8:32 pm**

a binary image located on a data fat partition

Is there a FAT filesystem on this partition?
How do you get the image into this storage partition?

Posted: **Thu Jun 20, 2024 8:58 am**

MicroController wrote: ↑
Wed May 29, 2024 8:32 pm

a binary image located on a data fat partition
Is there a FAT filesystem on this partition?
How do you get the image into this storage partition?

Yes, there is a FAT Parition in the partition table.csv
By Configuring the esp32s3 to act like Mass Storage device. So I can send the binary image direct from my PC or smartphone using USB OTG.

Posted: **Thu Jun 20, 2024 11:17 am**

You can't copy a FAT filesystem into an OTA partition and expect the FAT to be a valid firmware image.

Posted: **Thu Jun 20, 2024 1:58 pm**

Hi,
why can't the OTA API
esp_ota_begin/esp_ota_write/esp_ota_end
be used with fread ?

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