Re: machfb still broken for first gen iMacs

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

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Hello,

On Oct 2, 2010, at 5:35 PM, John Klos wrote:

> > I just tried a netbsd-5 kernel from today's (2-October-2010)  
> > sources on a first generation iMac and machfb still gives a mess.  
> > Pictures are here.
>
> Oops - I forgot the pictures:
>
> The first two are for reference and show a genfb kernel. This is a  
> first generation iMac with a VGA connection to a regular monitor.

What about the built-in monitor?

> http://www.ziaspace.com/~john/imac_machfb.jpg
> http://www.ziaspace.com/~john/imac_machfb_closeup.jpg

Ok, so this is not a video mode setup problem as I initially thought.  
No wonder I couldn't find anything.

> With machfb:
>
> ...
> machfb0 at pci0 dev 18 function 0: ATI Technologies 3D Rage Pro  
> (rev. 0x5c)
> machfb0: 16 MB aperture at 0x81000000, 4 KB registers at 0x80882000
> machfb0: 6144 KB SGRAM 98.924 MHz, maximum RAMDAC clock 230 MHz
> mach64_get_mode: 640 664 1016 800 480 491 525 525
> machfb0: initial resolution 640x480 at 8 bpp
> ...

Does the iMac lock up here or does it continue booting with an  
unreadable console?
Since this seems to be drawing engine related I'm afraid it's a lockup  
though, and since you see the 'initial resolution...' line we made it  
past engine initialization and mode setup.
Please do this:
- - comment out the mach64_clearscreen() call in mach64_attach() so  
output doesn't get lost
- - sprinkle printf()s to find out where exactly the messup happens,  
normal console output should work right up to wsdisplay_cnattach()
- - set options_MACHFB_DEBUG in your kernel config for extra loudness
This should give us an idea where the messup happens. As I said  
before, I have a beige G3 with onboard Rage II and a Sun PGX ( which  
is another Rage II on a PCI card ) - both work fine.
Finally, you could try to if (0) the ri->ri_ops.putchar = ... line in  
mach64_init_screen() so we fall back to software character drawing. If  
that helps at least I know where to look.

have fun
Michael

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