[Bug 291461] 15.0 doesn't UEFI boot on HPE MicroServer, other reported machines

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=291461

--- Comment #7 from Warner Losh <imp@FreeBSD.org> ---
maybe this is a duplicate of 292206 which was fixed in:

commit d82698ac68c23d856716dc9f6524b9ef363d7eba
Author: Jarmo Jaakkola <jarmo.jaakkola@roskakori.fi>
Date:   Wed Jan 7 22:14:56 2026 -0700

    loader.efi: Only use SPCR if enabled.

    SerialPort in the SPCR is zeroed when serial redirection is disabled,
    rather than the SPCR being omitted from the ACPI tables ony many
    systems. Check to see that SerialPort.Address is non-zero before using.

    FreeBSD would fail to boot on systems that could have a serial port
    redireciton, but don't have it enabled because the loader would create a
    bogus hw.uart.console. While one could unset this value to boot, you
    couldn't do that automatically very easily. Instead, don't even look
    at the SPCR table if the SerialPort is zero'd.

    PR: 292206
    MFC After: 3 days
    Sponsored by: Netflix
    Co-authored-by: Warner Losh <imp@FreeBSD.org>
    Closes:  https://github.com/freebsd/freebsd-src/pull/1948

Maybe cherry-pick to stable/15 and/or releng/15.0 and rebuild loader.efi and
see if that restores functionality.

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