Since you asked for com1, enable tty01 instead in /etc/ttys.

> On Mar 22, 2026, at 4:46 PM, Brian Brombacher <[email protected]> wrote:
> 
> 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 <[email protected]> 
>> wrote:
>> 
>> On 2026-03-22, Andrew Daugherity <[email protected]> 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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