You can spawn a login prompt on com0 through /etc/ttys and avoid changing boot.conf. Enable tty00 in /etc/ttys.
That's the best dual support you'll get.
> On Mar 22, 2026, at 3:48 PM, Stuart Henderson <stu.lists@spacehopper.org> wrote:
>
> On 2026-03-22, Andrew Daugherity <andrew.daugherity@gmail.com> wrote:
>>> I use
>>>
>>> ~ $ cat /etc/boot.conf
>>> stty com0 115200
>>> set tty com0
>>> ~ $
>>
>> You can configure a serial console in boot.conf, and switch back to
>> the default local console by holding the Ctrl during bootup to skip
>> loading the conf file (on i386 & amd64 at least, not sure about other
>> arches). From boot(8):
>>
>> boot.conf processing can be skipped, and the automatic boot
>> cancelled, by holding down either Control key as boot starts.
>
> You've got to be very lucky with timing on some machines.
>
>
> --
> Please keep replies on the mailing list.
>
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