X on XVR-100

[Michael Lorenz <macallan%netbsd.org@localhost>]

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Hello,

I got X to work on this card ( it's just a low end Radeon after  
all ), there are a few gotchas though:
- - we need to #ifdef all the vgahw stuff out - it won't do any good  
anyway since we don't use VGA text mode. We could just allow X to  
access PCI IO space instead, just like macppc does, but that would  
still not let vgahw do anything useful. I'll commit the necessary  
changes after some more testing on macppc.
- - there's some funny interaction between XFree86's radeon driver and  
radeonfb. X apparently switches the console back to  
WSDISPLAYIO_MODE_EMUL after some driver setup, at this point radeonfb  
restores its video mode, resets the drawing engine and redraws the  
console. Then X switches back to WSDISPLAYIO_MODE_GRAPHICS and lets  
the driver finish its setup. For some reason XFree86's radeon driver  
changes resolution in the first setup phase, then radeonfb switches  
back and the 2nd phase, relying on the 1st one, is screwed unless  
radeonfb and X use the exact same video mode. With genfb things just  
work but when X exits the radeon driver fails to restore the video  
mode so you can't see the console. I suspect Xorg behaves the same.
I'm not sure how exactly to fix this yet, but tracking down where and  
why X temporarily switches back to WSDISPLAYIO_MODE_EMUL sounds like  
a good idea to me.

have fun
Michael

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