52840 DFU mcuboot

RE: 52840 DFU mcuboot

Einar Thorsrud — Tue, 29 Jul 2025 08:42:58 GMT

Hi,

MCUBoot itself supports DirectXIP mode, where an application can run from any of the slots. This requiers the application to be built for that slot though, or position independent applications. It is not supported in the nRF Connect SDK, but if it is needed, you should be able to get it to work with some adjustments. See this thread.

RE: 52840 DFU mcuboot

Clever Huang — Tue, 29 Jul 2025 01:54:02 GMT

hi，Einar

thanks for your reply.

Since the installation structure cannot be programmed using swd, we conducted wireless testing before proceeding to formal application.
I would like to confirm whether the dfu based on mcuBoot requires an swap operation.

In other words, can the application only start execution from slot 0, and cannot be specified to run directly from slot 1?

Best Regards!

RE: 52840 DFU mcuboot

Einar Thorsrud — Mon, 28 Jul 2025 13:50:51 GMT

Hi,

The time it takes to swap the images depend on the size of the images, but for large images it is possible to see 40 seconds as you do. I do not have a good way around this. However, I wonder if you can tackle it at a system level? Can you do the testing while SWD is still connected, and then program the application firmware via SWD after testing but before disconnecting the programmer?