Puzzle involving serial console and ...??!?

[Dirk Engling]

  Original Message  
From: Marcel Moolenaar
Sent: Montag, 31. August 2015 18:20
To: hackers at freebsd.org
Subject: Re: Puzzle involving serial console and ...??!?


> On Aug 30, 2015, at 8:06 PM, David Wolfskill <david at catwhisker.org> wrote:
> 
> By doing so, I have a working serial console (once the FreeBSD
> loader gains control from the BIOS, at least)... half the time.
> 
> I have determined that whether or not I have a functioning serial
> console for freebeast depends on whether I boot albert from slice
> 1 or slice 2: if from slice 1, it doesn't work; if from slice 2,
> it does.

Check your boot sectors. boot0 is shared between the slices, so
that’s less of a concern, but boot2 is specific to each slice.
You can force a serial console by writing “-P“ to /boot.config
(if not already done).

It helps if you tell the kernel specifically to use a serial
console (as well):
boot_serial=yes
hw.uart.console=“io:0x3f8”
boot_multicons=yes

I have found that with vt(4) it’s pretty much impossible to
not have it claim the console. I haven’t figured out why...

--
Marcel Moolenaar
marcel at xcllnt.net