[Bug 266248] efi comconsole does not work with ARM64 Hyper-V

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266248

--- Comment #20 from Li-Wen Hsu <lwhsu@FreeBSD.org> ---
(In reply to schakrabarti@microsoft.com from comment #19)
I've also tested this with QEMU (https://wiki.freebsd.org/arm64/QEMU) as I have
no real arm64 hardware with UEFI. It also works fine.  I also asked other
people with physical arm64 server with UEFI to test. I think this can be merged
once we have good result from them.

BTW, after seeing https://reviews.freebsd.org/D36295 , I somehow suspect that
Hyper-V just doesn't accept setting 9600 baud rate and cause hang since I
believe "8, N, 1" is still widely used.

Souradeep, if you have time, can you help do tests of setting baud rate to 9600
and 115200?  I think using the firmware default is fine, but not sure if we
should just set it to 115200.

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