MCUBOOT Serial recovery not started on soft reboot

[UweRohrs]

Hi,

I've successfully incorporated MCUBOOT into software we developed for the nRF5340. I'm also able to start serial-recovery by activating a GPIO, reserved for this purpose, when the system powers up. However, when I reboot the system from software (using sys_reboot) the GPIO is ignored and normal operation resumes instead of again entering serial-recovery mode. I also tried using the watchdog to do a 'hard' reboot but that also doesn't work. The only way I can get it to work is by performing a proper hard-reset. However, the system has a battery backup (so I can't cycle the power) and there is no hardware reset mechanism.

How can I get the nRF5340 to enter serial recovery mode after performing a soft-reboot or a watchdog timer reboot? 

Thanks,

Uwe

[lincoln-lu]

 UweRohrs 

You can try the Retention System with boot mode, it support soft reboot. see the link below:

https://docs.nordicsemi.com/bundle/ncs-2.5.0/page/zephyr/services/retention/index.html

https://devzone.nordicsemi.com/f/nordic-q-a/113138/mcuboot-won-t-boot-into-serial-recovery-mode-by-using-retained-memory

I happen to be working on this too, and it works fine on my side.