Re: machfb (sort of) working on Mach64 GX

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

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Hello,

On Apr 28, 2011, at 11:32 AM, John D. Baker wrote:

> I've adapted your patch to -current (machfb.c r1.63) in case your
> findings might get the RagePro in the original iMac 233Mhz G3 to
> work.

It shouldn't do anything on a Rage II or Pro. The problem with the GX  
and similar old mach64 chips is that they have only one BAR - the  
aperture, which contains both VRAM and registers. Until now machfb  
depends on mapping the registers through one of the additional BARs  
found in newer chips ( which contain only registers and the last few  
generations have them both IO and memory mapped ). All the patch does  
is to make machfb attach with those old chip, use the registers in the  
aperture instead of depending on the additional BARs and give the  
correct memory type for older mach64. Both the Rage II and the Pro  
have at least one additional BAR so they should do exactly what they  
did before.

have fun
Michael

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