[Bug 265980] memstick image defaults to serial console on Asus PRIME Z690-P D4 / i7-12700 system

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=265980

            Bug ID: 265980
           Summary: memstick image defaults to serial console on Asus
                    PRIME Z690-P D4 / i7-12700 system
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: misc
          Assignee: bugs@FreeBSD.org
          Reporter: emaste@freebsd.org

I acquired a Intel i7-12700 and Asus PRIME Z690-P D4 motherboard for P/E core
experimentation, and tried installing from a memstick snapshot image
FreeBSD-14.0-CURRENT-amd64-20220819-545db925c3d-257513-memstick.img.xz

On my first attempt I see the screen blank after the loader, and then a short
while later a block cursor appear in the upper left hand corner.  Nothing else
happens.

The port has an onboard COM header but I had no cable. After acquiring one I
see that the system defaulted to a primary serial console at 115200. The video
console was unresponsive because the serial console was waiting at:

Welcome to FreeBSD!

Please choose the appropriate terminal type for your system.
Common console types are:
   ansi     Standard ANSI terminal
   vt100    VT100 or compatible terminal
   xterm    xterm terminal emulator (or compatible)
   cons25w  cons25w terminal

Console type [vt100]:

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