I often use the serial console on my servers through ILOM remote console access to install FreeBSD because it lets me cut and paste commands into a live shell from install media. Back with FreeBSD 8.x and previous, the console worked as a dual console between the redirected VGA/keyboard console and serial, all I had to do was drop to the loader prompt at the boot loader menu to enter:

set console=comconsole
set boot_serial=yes
boot

From then on, the VGA console was ignored until I rebooted. But in 9.x (currently trying 9.0-RC2 from the usb image), I have to interrupt an earlier loader to use -h or -D to enable serial(dual) console support at all. I then enter the two variables above as I usually do, then specify my terminal type (xterm), then choose "Live CD" which prints:
Updating motd: /etc/motd is not writable, update failed.
Configuring syscons: blanktime.
Starting cron.
Starting background file system checks in 60 seconds.

Wed Nov 23 19:03:02 UTC 2011

but then it prints the FreeBSD banner and spawns the login: prompt on the VGA console instead.

Is there something else I can set during the boot process to make this work? I could try modifying the configuration on the usb image to suit my site but this is more modification than I required in the past and surprisingly different. Please let me know if I can provide more information or help in some way. Thanks.

If I don't hear back in a few days or so, I'll make a PR.
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