FreeBSD on Pinebook Pro?

Hello,
I recently bought a Pinebook Pro, but I haven't been able to get it
to run FreeBSD reliably.  I can get it to boot, but usually the display
loses sync shortly after the kernel starts booting.  The display is
sometimes readable enough for text so I have experimented with it a
little.  It seemed to run well enough for a while but I have had it lock
up a couple of times.

I have used the RockPro64 images with the u-boot-pinebookpro applied as
directed.  I have tried FreeBSD 13.1-RELEASE, 13.2-RC2, and 14.0-CURRENT
and all of them have the same problem.  The Pinebook Pro works well with
the supplied Manjaro and with an Armbian version of Xubuntu.  I also
tried NetBSD, and that works but runs the battery down much too fast.

I assume others have run it since there is a u-boot for it, but maybe
recent versions are different than older versions.  Has anybody else
gotten FreeBSD to work with recent versions of the Pinebook Pro?

Thanks for any information.
-- 
Carl Johnson		carlj@peak.org