[Bug 264226] setting kern.vty=sc causes hang during boot

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=264226

--- Comment #4 from Ed Maste <emaste@freebsd.org> ---
(In reply to Kubilay Kocak from comment #3)

There's no need to include a log - this behaviour is clear from the code.

References:
sys/amd64/amd64/machdep.c
sys/kern/kern_cons.c

The priority order for choosing a console is:

- sc, if kern.vty=sc
- vt, if kern.vt=vt
- vt, if EFI boot (via vty_set_preferred)
- vt
- sc

(there's some redundancy left over, from the iterative approach we took to
changing the default)

Moving the vty_set_preferred handling to the top of the list would have the
behaviour you describe, but would mean the system ignores the user's setting
when it has a preferred choice.

The easiest way to address this will be to just remove sc from GENERIC.

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