HEADSUP: change in serial console handling

[Marcel Moolenaar]

Gang,

Yesterday I fixed the support for the Z8530 in uart(4), which was the
main blocker for not switching over to uart(4). With that fixed, I
enabled puc(4) and uart(4) and also disabled ofw_console(4), sab(4)
and zs(4) in GENERIC in 6-CURRENT. I updated /etc/ttys accordingly.

With uart(4) the default console handler for serial consoles, we are
also a small step away from having keyboard and mouse support enabled
by default. It's known to work on some models (like the U5/U10), but
it needs tweaking and testing on the U2 (and I think U1E). I'll be
doing that in the coming days/weeks.

The intend is to merge it all back to 5-STABLE for inclusion in the
upcoming 5.4 release. I'll be doing that in a couple of weeks. So,
if you can, play with it and report any problems.

Thanks to Daniel Seuffert for his contribution, without which there
wouldn't be any progress.

FYI,

-- 
  Marcel Moolenaar         USPA: A-39004          marcel at xcllnt.net