DFU speed over UART on NCS/Zephyr

RE: DFU speed over UART on NCS/Zephyr

Jared — Tue, 04 Aug 2020 04:20:58 GMT

I figured out what was going on. By default the bootloader uses dts.overlay In order to include another .overlay file it needs to be added like this:

cd ncs/bootloader/mcuboot/boot/zephyr
west build -b circuitdojo_feather_nrf9160 -p -- -DDTC_OVERLAY_FILE=boards/circuitdojo_feather_nrf9160.overlay

I'm compiling the bootloader separate and flashing it first. I can then upload application code using mcumgr or newtmgr.

RE: DFU speed over UART on NCS/Zephyr

Susheel Nuguru — Fri, 17 Jul 2020 08:09:11 GMT

[quote user="jaredwolff"]It does work the other way around (i.e. if I set the BAUD to 1M in the base .dts file and then update it to 115200 in the application)[/quote]

I am not an expert at this, but first setting the bad to 1M and then updating this in the application should work.

RE: DFU speed over UART on NCS/Zephyr

Jared — Tue, 14 Jul 2020 19:27:28 GMT

Thanks Susheel Nuguru!

I got it working at 1M BAUD using pynrfjprog. Speeds are so much faster now! 🙂

Now my question is, it seems that my .overlay file in the ncs/bootloader/mcuboot/boot/zephyr/boards directory is not being applied. I want to set the speed to 1M BAUD while leaving the application at 115200. Any thoughts there?

It does work the other way around (i.e. if I set the BAUD to 1M in the base .dts file and then update it to 115200 in the application) I'm still getting my head around devicetree configuration. Any help is appreciated!

RE: DFU speed over UART on NCS/Zephyr

Susheel Nuguru — Thu, 09 Jul 2020 08:21:56 GMT

Hi Jared,

I do not think that any of us have experimented with UART + MCUBoot with higher speeds.

[quote userid="3604" url="~/f/nordic-q-a/63500/dfu-speed-over-uart-on-ncs-zephyr"] It also seems like there may be some work being done in pynrfjprog but no direct developer tools like nrfjprog have been updated to use this functionality.[/quote]

You are right, So we need to wait until higher speeds support is officially added in Zephyr. I do not have any timelines for this.