> The CATS kernel dies with getty /dev/ttyv0 Operation not supported by
> device.
> 
> We have /dev/ttyv0 major 4 minor 0. Not even read/write appear to work,
> when we telnet in the use echo.

Did your previous kernel have wscons?  This sounds like the trouble I had
when I first changed over.  Assuming you've done ./MAKEDEV wscons in /dev,
then you need to make sure you've got the right entries in /etc/ttys.
wscons uses ttyE0 instead of ttyv0.

I think you can also fix this by making /dev/ttyv0 a symlink to
/dev/ttyE0?

HTH,

David.