RE: Unable to merge bootloader softdevice and application.

mdwp — Fri, 13 Mar 2020 09:51:30 GMT

The issue was inside the bootloader code.
examples/dfu/open_bootloader/pca10056_usb_debug
Probably because I changed the logging to UART instead of RTT.
The NRF_LOG_FLUSH() in the nrf_bootloader_app_start did not return, so the application did not start and the bootloader got stuck.
Commenting out the NRF_LOG_FLUSH() fixed this, now everything works.

Thanks for the help though!

RE: Unable to merge bootloader softdevice and application.

Hung Bui — Tue, 10 Mar 2020 17:01:55 GMT

Hi,

Have you tried to flash Softdevice + Bootloader and then do a DFU update the blinky firmware ? (1)

It's normal what you described when holding the bootloader button. The bootloader should enter DFU mode when requested (button is pressed)

The case when the button is not pressed, you may want to step into the bootloader and debug. (Make sure you change the optimization level to 0).

Please check if dfu_enter_check() return false. dfu_enter variable should equal false and nrf_bootloader_app_start() should be called.

Please double check that the softdevice is flashed, not just the MBR.

One thing you can do is to compare the hex dump you have at (1) after you DFU update the blinky firmware (use nrfjprog --readcode or use nRF Connect app) and hex dump after you flash the merged hexes.