MCUBoot partition manager flash signature validation

RE: MCUBoot partition manager flash signature validation

Vidar Berg — Fri, 17 Apr 2026 08:02:39 GMT

Hello,

As Turbo J pointed out, the settings partition must not be placed within the MCUboot slot, and if MCUboot is immutable, it is not possible to change the size of these slots. However, from the thread you linked, it appears that you may have some free space in your external flash. Would it be an option to place your storage partition there without changing the secondary slot?

Best regards,

Vidar

RE: MCUBoot partition manager flash signature validation

Turbo J — Fri, 17 Apr 2026 06:12:00 GMT

You might want to post your partitions.yml or pm_static.yml file here: The settings or storage partition should never be part of any code partition that mcuboot cares about.

Note that fixing this problem may require usage of the SWD debugger. I don't see how one could fix this in the field unless you opted for one of the "mutable" bootloader setups.