Hi, both the latest stable 4.20.2 and 5.0 rc2+ hang early on the G5 Quad.
Surely I'm not the first to run into this, but I couldn't find any discussion or bug report. Sorry if you're already aware. You can see it hang here (5.0 rc2+, 4.20.2 is nearly identical) until the watchdog triggers a reboot: https://i.imgur.com/UiCVRuG.jpg If I had to make an uneducated guess, it seems to boot into the same codepath twice (mpic was already initialized, then it starts again right after smp bringup). Maybe on a second CPU? To narrow it down a little, my last known good was 4.18.9