I don't use Sparc boxen with OpenBSD, myself, but I found this in the sparc@ mailing list archive. It may help.
http://marc.info/?l=openbsd-sparc&m=107247800227645&w=2
Quote:
One problem usually with SPARC's (which I had) and X was that you need
to set the default color depth to 32 instead of 24 bit (even though the
framebuffers are 24-bit) if you want it to work. Unless, of course
you're satisfied with 8-bit 
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