Re: R10K crmfb

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

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Hello,

On Jun 24, 2008, at 14:30, Manuel Bouyer wrote:
> Reply-To:
> In-Reply-To: <84A05B3C-8DF9-4EF8-821C-B099283314CA%netbsd.org@localhost>
>
> On Tue, Jun 24, 2008 at 10:42:13AM -0400, Michael Lorenz wrote:
> > > > PS: something completely different - does crmfb work properly on  
> > > > your
> > > > R10k O2? And did you ever try my accelerated X hack?
> > >
> > > I've used it though serial console for the USB tests. I can try the
> > > VGA display this evening.
> >
> > Thanks :)
>
> Well, crmfb0 itself doesn't work. The system boots, but the display is
> messed up: thin (1 pixel) dark red vertical lines on a black  
> background,
> with 6 2-pixed white horizontal lines, starting a line 0.

This is weird, as if the graphics backend reads from different tiles  
than the rendering engine writes to, or the rendering engine doesn't  
render. Crmfb doesn't directly access any visible video memory - to  
avoid having to deal with tile borders I have rasops draw into an off- 
screen tile and then blit it into place. Maybe I should memset() it  
with something recognizeable for testing.
Do the red lines disappear eventually?
If they do then at least the memory transfer engine works ( it's kind  
of a very simple but very fast blitter, setup errors are rather  
unlikely for lack of functionality )

> crmfb0: initial resolution 1024x768

Hmm, I never tested crmfb with anything else than 1280x1024  
( couldn't figure out how to change video mode in ARCS or how to make  
IRIX's video mode stick ). The memory transfer engine has some weird  
constraints regarding the width of a rectangle to copy but 1024 would  
be even more likely to fit than 1280.

have fun
Michael

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