https://github.com/makerdiary/nrf52840-mdk
I was unable to get this working with the openocd that ships with ubuntu 18.04, but was able to hook up SWD to my JLink. This thread is someone else having similar issues:
https://devzone.nordicsemi.com/b/blog/posts/debugging-on-nrf52840-with-gdb-from-cli-on-linux
I hooked up my JLink using one of these breakouts: https://www.adafruit.com/product/2743
| MDK | SWD Breakout |
|---|---|
| 3V3 | Vref |
| RST | RST |
| SWDIO | SWIO |
| SWCLK | CLK |
| TDO | SWO |
| GND | GND x 3 |
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