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

From: <bugzilla-noreply_at_freebsd.org>
Date: Wed, 09 Nov 2022 06:13:37 UTC

--- Comment #13 from Toomas Soome <tsoome@freebsd.org> ---
What is the output from show efi-version?

I did test this code with qemu (when I did develop it) and vmware fusion tech
preview (just today), both working as expected.

In mail to lwhsu@freebsd.org, I did suggest:

For an experiment, I’d suggest to use attribute values for defaults (0 for baud
rate, 0 for fifo depth, 0 for timeout, DefaultParity, 0 for data bits and
DefaultStopBits). This should not change anything but if system will still
freeze, it would clearly suggest bug in firmware… And if so, I guess, we can
not use SetAttributes there and must rely on values set in firmware. The archsw
has function to test hypervisor, so that could be used to detect hyperv on arm…
note, this code is not used on x86, there we use bios version.

Hope this helps...

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