Hi Craig,

# stty -a
speed 9600 baud; 0 rows; 0 columns;
# echo $TERM

Any idea how I can fix this?  The console inside the VM
is quite unusable when it does not have the correct
rows/colums set.

Not sure how you're getting 'dialup' as the terminal type: the default ttys file for 10.1 shouldn't need to be edited, and has

ttyu0   "/usr/libexec/getty std.9600"   vt100   onifconsole secure

The rows/columns is always 0 for uart-style serial lines since it's not possible to know what's on the other end. That's why $TERM has to be set correctly for these.

Having an xterm attached to the other end of an nmdm device isn't too different from swapping say a vt100 with a vt420 or some other terminal with a different resolution on a real serial line. There's no way for the serial driver to know this has happened.

The only way to fix the changing-size problem is to have a paravirtualized tty device that has a way of reading the terminal window size and being informed of changes. The virtio-serial specification has this ability, however, the FreeBSD driver for this can't operate in polled mode so can't be the main console port, and in any event there's no bhyve backend for it currently.

 Or, you can network-login to the guest in which case xterm works fine :)


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