[Bug 268736] FreeBSD boot stuck with comconsole in x86 Hyper-V Gen2

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=268736

            Bug ID: 268736
           Summary: FreeBSD boot stuck with comconsole in x86 Hyper-V Gen2
           Product: Base System
           Version: CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: bugs@FreeBSD.org
          Reporter: schakrabarti@microsoft.com

When booting current FreeBSD on Hyper-V x86 gen2 VM, if we set
console="comconsole", then boot is getting stuck.

boot -v
Loading kernel...
/boot/kernel/kernel text=0x18b088 text=0xe1ece8 text=0x6bfa3c data=0x140
data=0x1c9b60+0x4354a0 0x8+0x199f08+0x8+0x1ba8e1|
Loading configured modules...
can't find '/boot/entropy'
can't find '/etc/hostid'
staging 0xeec00000 (not copying) tramp 0xeeb64000 PT4 0xeeb5b000
Start @ 0xffffffff8038c000 ...
EFI framebuffer information:
addr, size     0xf8000000, 0x800000
dimensions     1024 x 768
stride         1024
masks          0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000
GDB: no debug ports present
KDB: debugger backends: ddb
KDB: current backend: ddb
---<<BOOT>>---
APIC: Using the MADT enumerator.
No panic or call trace is seen.

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