[Bug 210412] UEFI boot and console problems on 2008 Mac Pro w/ 10.2-STABLE

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=210412

            Bug ID: 210412
           Summary: UEFI boot and console problems on 2008 Mac Pro w/
                    10.2-STABLE
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: stephen at slarew.net
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Created attachment 171619
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=171619&action=edit
uga output

First of all, I believe my problem is related to bug #202730.

I am trying to boot 10.3-RELEASE on a Mac Pro 2008. I boot the mac and hold
down the ALT key to choose the memstick (flashed with
FreeBSD-10.3-RELEASE-amd64-uefi-memstick.img).  I see the FreeBSD text boot
loader and proceed to let the system boot in multi-user mode to get to the
installer.

The problem I encounter is that once the kernel is loaded, the kernel console
output is nonsense garbled data.  I believe the problem is due to potentially
incorrect graphics settings?

Sorry I do not know all the correct terminology to describe what I'm seeing.

After reading bug #202730, I ran the `uga` command at the boot prompt.  See the
attached image for the output.  Perhaps the errors can help diagnose the
problem?

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