Installation 'halts' at boot after initialising UEFI framebuffer

[cbz]

Hi -

Currently when I try to use the installation media the boot process appears
to halt right after initialising the EFI framebuffer.  The messages I get
are identical to the ones here, except that the resolution is different.  I
can screenshot if there is sufficient interest:

https://lists.freebsd.org/pipermail/freebsd-questions/2016-July/272697.html

Looking here, it appears that this was a problem with FreeBSD in the past,
and possibly one that was later fixed (there are various references on the
web to alternatively using the 'gop' command in the boot loader, or setting
variables like kern.vty):

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209821

Has anyone seen anything similar with dragonfly and been able to fix it ?
Switching back to legacy (non-UEFI) mode is not an option in this case as
the motherboard doesn't support this.  Are there any boot
variables/settings I can change to use a non EFI framebuffer console?

I quoted 'halts' in the subject, as my belief is that the installer process
actually works, it's just that the framebuffer device isn't working
correctly (as per the first link above).

Regards,
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