serial DFU update with SD+BL+APP

[kevinlam]

Hello,

According to the description in below page, "The image can be an application image, SoftDevice image, bootloader image, or a combined image of bootloader and SoftDevice."

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v14.2.0%2Fsdk_app_serial_dfu_bootloader.html&cp=4_0_0_4_4_2 

Does it mean if DFU (SD+BL+APP) altogether, I have to do DFU twice? Firstly DFU (SD+BL) and then DFU (APP)?

And also when DFU the soft device, is it possible to upgrade / downgrade if the major version is different? for example DFU from 15.2 to 16 / 16 back to 15.2? 

Thanks!

Kevin

[kevinlam]

Thanks for the feedback Einar.

I just tried to use nrfutil to dfu my nRF52840 EVB, below shows you what inside the package file (.zip), manifest.json and the command line to issue dfu:

nrfutil dfu serial -pkg test.zip -p com69 -fc 0 -b 9600

dfu can start as normal but end up the application is not being updated. Please advise how can I use nrfutil to dfu the full image (SD+BL+APP)?

Thanks,

Kevin

[Einar Thorsrud]

Hi Kevin,

Ah, now I see. You are right, I had not noticed this before, but unlike the other DFU master implementations we provide, nrfutil does not support splitting this into two operations when it acts as DFU master. Since this is not supported you will have to use two images in this case.

[kevinlam]

Hi Einar,

If that is the case, serial bootloader can only support single image dfu (SD+BL) or (APP) as described in the document.

Thanks for your great support.

Kevin