I spent a bit of time this afternoon getting the video driver VTIO written just enough to get the Write routine working. Fatigue was setting in because I was making some dumb mistakes in my coding, which I eventually caught, but it made for a longer session than I would have liked.
But it was worth it. NitrOS-9 now boots and shows output. This validates that the I/O subsystem, including IOMan, SCF and the VTIO driver are doing their thing.
I stuck the mfree command in the bootfile, so SysGo forks that. You can see the NitrOS-9 banner and the output of mfree in the video below.