MCUBoot + CPUAPP + FLPR with BLE DFU

RE: MCUBoot + CPUAPP + FLPR with BLE DFU

Vidar Berg — Wed, 12 Aug 2026 06:40:36 GMT

Glad to hear! Thank you for the update.

Vidar

RE: MCUBoot + CPUAPP + FLPR with BLE DFU

Notnac60 — Sun, 09 Aug 2026 17:38:14 GMT

Hi Vidar,

I integrated your solution into my application, and it works perfectly. Thanks for the elegant solution and the quick reply!

Dennis

RE: MCUBoot + CPUAPP + FLPR with BLE DFU

Vidar Berg — Thu, 30 Jul 2026 10:34:44 GMT

Hi Dennis,

Thank you for the kind feedback. Regarding debugging, this approach should not affect debugging support, as the FLPR code is loaded from the C array to RAM before execution. Also, if you inspect the *.map file for the coprocessor image, you will see that everything is linked to RAM so it does not matter where the code is located initially in RRAM.

Kind regards,

Vidar

RE: MCUBoot + CPUAPP + FLPR with BLE DFU

Notnac60 — Wed, 29 Jul 2026 18:20:31 GMT

Hi Andreas,

Thanks for the fast reply. I had a look at the repository, and it's a really smart and elegant solution. It does indeed solve all the issues I ran into while following the official guide.

One question regarding debugging: since the FLPR firmware is now embedded as a const C array in the CPUAPP, how do you debug the FLPR? As I understand it, you can't debug both cores at the same time with this setup.

Kind regards,

Dennis

RE: MCUBoot + CPUAPP + FLPR with BLE DFU

AHaug — Tue, 28 Jul 2026 12:53:47 GMT

Hi,

I'm gonna start by suggesting this sample by my colleague Vidar: https://github.com/vidarbe/ncs_hello_world_with_flpr This should solve the question about image signing, but I believe there are some differences between your implementation and his. Could you have a look at this and let me know if this works for your use case?

[quote user=""]

Partition Manager

Since the documentation mentions that Partition Manager will eventually be discontinued, is it already possible (or recommended) to build this setup without using Partition Manager?

[/quote]

I believe it should be, but I've not validated it myself. You could try creating a version of the sample which has been sent through this script: https://nrfconnectdocs.nordicsemi.com/ncs/latest/nrf/releases_and_maturity/migration/migration_partitions.html#migrate-your-project-to-dts-partitioning in NCS 3.4.0

Kind regards,
Andreas