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When an OTA image size is larger than 50 MMU pages (approx. 3.2 MB), secure_boot_generate fails while trying to map it into memory: https://github.com/espressif/esp-idf/blob/master/components/bootloader_support/src/esp32/secure_boot.c#L72 Instead of trying to map the whole image, secure boot code should split the image into chunks and map them one by one, like it is done in esp_image_format.c: https://github.com/espressif/esp-idf/blob/master/components/bootloader_support/src/esp_image_format.c#L371 Signed-off-by: Vikram Dattu <vikram.dattu@espressif.com>