4.3->4.4 ATI Mach64 regression

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On a beige Power Macintosh G3 with ATI 3D Rage Pro video running NetBSD 2.0_BETA, XFree86 4.3 worked. XFree86 4.4 doesn't:

...
(--) PCI:*(0:18:0) ATI Technologies Inc 3D Rage I/II 215GT [Mach64 GT] rev 154, Mem @ 0x82000000/24, I/O @ 0x0400/8
...
(WW) ATI: PCI/AGP Mach64 in slot 0:18:0 could not be detected!


As an experiment, I replaced "ati_drv.o" and "atimisc.o" with the versions from 4.3, and X worked again.

More information:

http://netbsd.schmonz.com/xf44-ati/XF86Config
http://netbsd.schmonz.com/xf44-ati/pcictl-pci0-dump-18.txt
http://netbsd.schmonz.com/xf44-ati/xf43-log.txt
http://netbsd.schmonz.com/xf44-ati/xf44-log.txt
http://netbsd.schmonz.com/xf44-ati/xf44-with-ati43-log.txt

(FWIW, the 4.3 and 4.4 builds I'm using both came from NetBSD xsrc.)

The same symptoms manifest with 4.4 on a Power Macintosh 6500 with very similar video, though I haven't tried the 4.3 ATI driver with that one yet.

Is there more information I can provide? Ideas of things to try? I'm up for a binary search if that's what it takes, but would prefer to try something less time-consuming first if possible. :-)

Thanks,

- Amitai
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