You should be able to use nRFDK to upload & debug, via P20 debug header.
I’ve tried it myself, couldn’t do it yet, had to do other stuff.
But I need it now, so I’ll get back on it.
I was using Nordic SDK, Eclipse, gcc on nRF DK and my simple Blinky worked fine
I’ve also tried to run DAPLink, openOcd, Eclipse, gcc as the debug upload interface,
needed to have a correct .cfg file.
Will post when I get one working.