Issues in loading application via nRFConnect using Secure Serial Bootloader & SoftDevice

[beemavishnu]

Hello,

 

I am using nRF52840, SDK_16.0.0, S140 SoftDevice and Segger 4.16 for flashing the image. I am using ‘ble_app_blinky’.

1) Initially I loaded Secure serial bootloader with Public/Private key and SoftDevice S140 from below path using nRF Connect Desktop tool.

     \examples\dfu\secure_bootloader\pca10056_uart\ses\Output\Release\Exe

      \components\softdevice\s140\hex

2) Later I am trying to load ble_app_blinky example using private/public key. But in nRF Connect tool its showing different address. Application is overlapping to SoftDevice.

3) Still after flashing I am not able to see the application running and device is still in boot mode. Even after reset, device is in boot mode.

4) But using nrfutil tool I am able to flash via secure serial bootloader.

My query is why I am not able to load using nRFConnect Desktop tool after loading Secure serial bootloader and SoftDevice but worked using nrfutil.

 

Thanks & Regards

Vishnu Beema

[Hung Bui]

Hi Vishnu, 

1)The bootloader setting is normally written when the bootloader booting up and find nothing in the bootloader setting area. It's also get updated when a new image is DFU updated. It will mark the application area as valid area.

The reason we generate the bootloader setting and flash it manually is to tell the bootloader that there is a valid image and it should boot to the application instead of staying at DFU mode. 

2) The bootloader setting has nothing to do with the softdevice. The information about the softdevice is extracted from the softdevice itself and is not stored in the bootloader setting.