Re: machfb (sort of) working on Mach64 GX

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

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Hello,

On May 3, 2011, at 10:30 AM, John D. Baker wrote:

> On Tue, 3 May 2011, Michael wrote:
>
> > > dsp_precision = 4, dsp_loop_latency = 10,
> > > mclk_fb_div = 228, vclk_fb_div = 181,
> > > mclk_post_div = 2, vclk_post_div = 2
> > > /* above is the last legible line printed at the bottom of the  
> > > screen */
> > > /* everything from this point forward is compressed into the upper- 
> > > left */
> > > /* 1/16th of the screen (1/4 width, 1/4 height).  As such it is  
> > > just an */
> > > /* illegible jumble of gray and white vertical bars littered with  
> > > pixel */
> > > /* garbage that would be the screen text. */
> >
> > Does the line above remain visible / readable? If it does then the  
> > mode setting code is actually doing the right thing and we screw up  
> > somewhere initialising the drawing engine.
>
> Yes.  The lines between the "screen goes black, these lines scroll up"
> comment and the above comment block remain readable as long as the
> machine is running.  Console/ttyEn output makes the pixels dance in
> the upper-left region of the screen as noted.

Ok, so the mode setting code works properly and I need to have a good  
look at the drawing engine initialisation.

> Now that I've got more noise from the driver, one additional thing I'm
> going to try is to see if any of the reported information is different
> once I let MacOS X touch the hardware.  As I noted in the past, if  
> MacOS
> X is allowed to boot first, rebooting with NetBSD sees machfb display
> just fine.

It probably does the drawing engine setup for us - looks like machfb  
does just enough to make it work on the cards I have, which work  
because the firmware actually uses the drawing engine and so leaves it  
in a usable state. Now it's just a matter of spot the uninitialised  
register(s).

have fun
Michael

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