simultaneous DFU on nRF5340 and NCS 2.6.1 without external flash

RE: simultaneous DFU on nRF5340 and NCS 2.6.1 without external flash

Vidar Berg — Mon, 30 Sep 2024 09:25:34 GMT

Flash space is not necessarily a problem, it depends on the size of your current application. For instance, having both slots in internal flash will not work if you are developing a Matter application.

It is also possible to perform serial recover (DFU within the bootloader) over UART or USB using the mcumgr. There are some un-official samples of this here: https://github.com/hellesvik-nordic/samples_for_nrf_connect_sdk/tree/main/bootloader_samples/serial_recovery

Vidar

RE: simultaneous DFU on nRF5340 and NCS 2.6.1 without external flash

Mary — Thu, 26 Sep 2024 20:21:24 GMT

My hardware has a USB port. Is it possible to use mcumgr or nrfutils to do an update via the UART over USB?

Or is there still a problem with flash space?

Mary

RE: simultaneous DFU on nRF5340 and NCS 2.6.1 without external flash

Vidar Berg — Thu, 26 Sep 2024 14:53:29 GMT

Hello Mary,

Unfortunately, the current implementation assumes that external flash will always be used for multi-image DFU, since there otherwise will be little room left for the application. That said, it looks like it should be possible to support this if you cherry pick the following commits:

- https://github.com/nrfconnect/sdk-nrf/pull/10060

- https://github.com/nrfconnect/sdk-mcuboot/pull/235

Best regards,

Vidar