Kernel debugger on RockPro64

[John Klos <john%ziaspace.com@localhost>]

It seems that even when not using awge0, a RockPro64 will lock hard after 
a bit of compiling (-current from today, USB root, axe0 USB-ethernet). 
However, it doesn't seem to be possible to get in to the kernel debugger 
via the serial console via a traditional break, so I set hw.cnmagic to ~~ 
and verified it works when the system isn't locked.

However, after lockup, there's no getting in to the kernel debugger. How 
does one go about diagnosing this?

John