> There was a change/regression where you need to specify ttyS1 for
the
> console, not S0, I believe it should work fine for that, I think I
> know what the issue is but I'm traveling this week in endless meetings
> so I've not had time to verify my theory as to why that is
Another observation.
Burning the Minimal image, inserting it in the RPi3 and booting it with the
serial "cable" connected, serial communication works even if I have not
"enabled" it in config and extlinux.
The kernel could see the serial port anyway due to the DT, and the
kernel might get the option automatically by the bootargs or console
options from the firmware although I'm guessing here.