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XVR-100 - radeonfb & PCI kernel issues

Following on from my Ultra10 Sparc64 migration story, I've finally had
time to install a XVR-100 graphics adapter. It all works pretty
straight forward, by configuring it in OpenBoot correctly.
The XVR-100 boot logo looks very nice!

But there is a problem with the radeonfb kernel driver, because
several BAR regions can't be assigned, and there is a conflict noted
with video memory. I guess it stops trying different regions when it
gets to BAR 6.

And, I guess because of this, later during the boot process the
radeonfb driver points out that it can't read the ROM nor can it
assign BAR 6.

Possibly these are the root cause of why when the xserver loads the
radeon driver, and then it doesn't get a match so it then unloads and
bails out, leaving no screen.

I have posted some screen images here, for reference.

Over the past few days (since my initial posting), I've tried moving
the PCI bus probe order, and disabling unnecessary PCI devices. But
there is no change to the errors posted in dmesg. No improvement in
the outcome.

Any thoughts on how to fix this?

Where is the best place to file a bug report?
With the kernel team? Or with Xorg team? Or otherwise?

Cheers, Phillip

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