Sun45 garbled radeondrm output

Hello sparc@,

I have a nice Sun45 at my desk and the only system that would actually
install is OpenBSD ! Never mind NetBSD, Debian, Gentoo all failed. Did
not try : FreeBSD, Ubuntu.

If I boot 7.8 multiuser _with_ radeondrm (the default) it gives
garbled output as soon as radeondrm0 activates the frame buffer. I
tried with DMS-59/HDMI and DMS-59/VGA to no avail it does not change a
thing except the resolution of the garbled output. The output looks
like 4 or 6 screens were badly rendered side to side. Probably a
blitter error missing info on the pixel fragments / x position. An
iterator problem probably on x. Y seems ok but reduced. X is repeated
with wrong colors.

Trying with snapshots now. The boot stops at checking filesystems...
I've been waiting 6 hours for the fs check to complete to no avail.
Will try again.