How to add Dependency to multiple images for nRF5340 multi image DFU

[roshangeoroy]

Dear Support Team,

Hardware : nRF5340 Custom board

Software : nRF Connect SDK v2.2.0

I have implemented OTA FW update for nRF5340. I've used multi-image simultaneous update configuration for the same. I have been testing and noticed that even if the network core image is not valid, the app core was being updated. I then found out that you can add dependency on images using imgtool [format_to_add_dependecy] during the signing process. I couldn't find much resources or examples on the same. Is the dependency mentioned here https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/mcuboot/imgtool.html#signing-images concerning only the version number or does it also apply when the image is corrupt?

With the given command format, I have created the binaries but I can still see that the app core updated even when network core fails during the bootloader checks.

Your help is much appreciated.

Thanks, 

Rosh

[Ian]

roshangeoroy were you ever successful with the dependency feature on the nrf53? I am also looking to revert a simultaneous update if there is a problem with one or more images.