nrf5340: B0 + MCUBoot Bootloader SMP DFU Upgrade Process

RE: nrf5340: B0 + MCUBoot Bootloader SMP DFU Upgrade Process

anthony32086 — Mon, 03 Nov 2025 18:10:09 GMT

Thanks for the update.

As a workaround for my use case, I was able to get the info in application using CONFIG_SECURE_BOOT_STORAGE and directly accessing the monotonic counter written by B0 before it boots S0/S1 which contains the version and slot info I need.

get_monotonic_counter(BL_MONOTONIC_COUNTERS_DESC_NSIB, &monotonic_version_and_slot);

RE: nrf5340: B0 + MCUBoot Bootloader SMP DFU Upgrade Process

Amanda Hsieh — Mon, 03 Nov 2025 15:07:42 GMT

Hi,

This is currently not supported. At the moment, the application has no way to know if MCUBoot is running from S0 or S1. This would require MCUBoot itself to detect if it is running from S0/S1 and pass this information to the application via a mechanism like retention.

-Amanda H.

RE: nrf5340: B0 + MCUBoot Bootloader SMP DFU Upgrade Process

Amanda Hsieh — Thu, 30 Oct 2025 16:26:39 GMT

Hi,

I am working on your issue and will update you once I have enough information.

Regards,
Amanda H.