[Bug 202276] Changes to vt(4) in r286667 makes FreeBSD unbootable in VirtualBox

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=202276

            Bug ID: 202276
           Summary: Changes to vt(4) in r286667 makes FreeBSD unbootable
                    in VirtualBox
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ed at FreeBSD.org

Created attachment 159818
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=159818&action=edit
Screenshot of VirtualBox

Attached is a screenshot of a GENERIC FreeBSD kernel at r286667 booting in
VirtualBox 5.0.0. Almost immediately after starting the kernel, video gets
corrupted and the system locks up. r286666 works properly.

The same also happened with VirtualBox 4.3.28 and 4.3.30. I'm using the boot
loader from FreeBSD 10.1. As far as I know, that shouldn't be an issue, right?
We want FreeBSD 11.0 to be bootable from 10.

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