RE: SDK 15.3 : Flash application does not run after flash softdevice and bootloader as advised on Devzone topics

Edvin — Thu, 22 Aug 2019 11:50:06 GMT

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After that, I flash the app and it does not run and I still see DfuTarg. I tried to delete --sectorerase from makefile for flash application but still the same.

So I guess that --sectorerase should only erase the pages of application i.e from 0x00026000 to 0x00049000 (in my case).

It stays stuck in Dfu mode.

Questions :

#1 : Are there any parameter missing to start app? Can the bootloader not be able to find the start address of the app ? What could it be else ?

It depends on what is in the flash before you flash your application and bootloader on the other places than where the bootloader and application are.

Try to run "nrfjprog --eraseall" first, so that you know you start with a blank flash.

Another thing: The bootloader uses a CRC check to verify the application. That it was transferred via DFU, and not inserted by someone else. So either you need to update the application via DFU, or you need to also program the bootloader settings to match the CRC of the application. You can generate bootloader settings like this. Then you program it like you program the bootloader and application:

nrfjprog --program bootloader_settings.hex.

#2 The MBR should be backwards compatible. The MBR is part of the softdevice, but is never changed during DFU. Also, it doesn't change between softdevices. Try #1 solution first, and we can look into the MBR stuff if that doesn't work.

Best regards,

Edvin