Question about app image format and bootloader

[coolwanglu]

I'm using ESP32S3. I enabled Flash Encryption using a hello world ESP-IDF project. Then I flashed my esp-rs project (without bootloader), but it stopped working. The bootloader complained someting about "efuse blk revision", but I think it's just bad image data.

I compared the image of the ESP-IDF project and the esp-rs project. Both have the esp_image_header_t header, but the esp-rs binary does not have the app description header.

It works if I use the bootloader from esp-rs, (generate a merged image, encrypt and flash).

Is this expected? I thought the bootloader is generic, but maybe something changed between v5.1 and v5.4?

Not sure if this is related to #745

[jessebraham]

I'm not sure what you're referring to by esp-rs exactly (this is just the name of the organization), but I'm assuming you mean a project using esp-hal?

We just recently merged a PR adding support for the ESP-IDF application descriptor (esp-rs/esp-hal#3124), so using the main branch should resolve the problem when using the latest ESP-IDF bootloader.

Alternatively, using an older version of the bootloader, such as the one currently bundled with espflash, should work as well. IIRC this descriptor was added in ESP-IDF 5.3 (plus or minus a release).

[coolwanglu]

Yeah, I meant an esp-hal project.
Thank a lot for your reply!