[Bug 240294] x11-drivers/xf86-video-ast does not work on FreeBSD 12

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240294

--- Comment #2 from darius at dons.net.au ---
FWIW I did try the code from the ASPEED website which is slightly newer but it
had the same effect.

I wonder if the mapping to physical memory isn't working properly, although it
works for the frame buffer and must work for *most* of the registers since it
can successfully draw things.

That said the registers it has trouble with are offset >0x10000 (ie 64k) where
as most of the others seem <0x10000 - so perhaps there is some rounding issue
with mapping? (wild guess..)

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