[Bug 265980] memstick image defaults to serial console on Asus PRIME Z690-P D4 / i7-12700 system - EFI FW does not set ConOut variable

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

--- Comment #10 from Ed Maste <emaste@freebsd.org> ---
commit df065f699f1ff819bb9607c44a6754275ab335ed
Author: Warner Losh <imp@FreeBSD.org>
Date:   Fri Aug 26 15:46:33 2022 -0600

    stand: More sensible defaults when ConOut is missing

    When ConOut is missing, we used to default to serial. Except we did it
    in the worst way possible by just setting the howto bits and not
    updating the console setting, which lead to weird behavior where we'd
    get some things on the video port, others on serial.

    Instead, set console to "efi,comconsole" for this case. Also set
    RB_MULTIPLE always (so we get dual consoles from the kernel) and or in
    RB_SERIAL when we can't find GOPs that suggest the precense of a video
    console. This will put output in the most places and have a sensible
    default for 'primary' console.

    Sponsored by:           Netflix
    Reviewed by:            emaste, manu
    Differential Revision:  https://reviews.freebsd.org/D36299

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