That's been kind of easy. Done and works.
Thanks to the good documentation on the wiki!
O.k. started 'journalctl -f' in the serial console.
Anything else I could watch there to find out about the phone getting unresponsive?
https://gitlab.com/mobian1/mobian-meta/-/issues/2
Got the journal of my #pinephone running #mobian via serial link while it changed its date and time and the screen became unresponsive.
I'm amazed. Just like that a serial console for debugging on my #pinephone. It's a phone that behaves like an sbc ;-) ...