Re: O2 framebuffer problems with install kernel

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Hello,

On Jul 28, 2008, at 11:14, Jorge Acereda wrote:

> On Mon, Jul 28, 2008 at 4:50 PM, Jorge Acereda <[email protected]>  
> wrote:
>
>> In any case, I've hardcoded the resolution in the code to 1024x768,
>> now it seems to initialize crmfb0, but I still get the same result.
>> Well, I get more horizontal white strips, which probably means it's
>> printing more stuff than before. It was probably dying earlier  
>> because
>> it didn't find a properly initialized console.
>
> I think the problem should be an unitialized register. I've compiled
> with CRMFB_DEBUG enabled. I had to tweak some register names, because
> CRIME_MTE_SRC_STRIDE and CRIME_MTE_DST_STRIDE seem to be called now
> CRIME_MTE_SRC_Y_STEP and CRIME_MTE_DST_Y_STEP (anyone with CVS access
> can fix those?).

I'll do that. The register names were initially copied from a very  
rough and incomplete reference I've found and later, when I found out  
how to get the thing going, some were renamed to reflect reality a  
bit more - looks like I missed a few.

> The screen is still garbled, but this time, I see some green and white
> garbage, that is probably the kernel messages being printed in green.
> But the result is clearly different.

Hmm, those registers belong to the Memory Transfer Engine ( think of  
it as a very dumb but very fast blitter, we use it for scrolling only  
since it has some funny alignment requirements ). These registers  
should be set to 1 or -1 respectively, depending if you want to copy  
top-down or bottom-up.

> BTW, is 8 bpp the only depth supported at the moment?

Yes and no. We run the console in 8bit but for X we switch to 32bit.  
Right now X requires a hacked driver and XAA module which are  
available from ftp.netbsd.org ( it uses the rendering engine for  
pretty much everything including XENDER ops but it still has  
problems. It's good enough to run things like WindowMaker ( or any  
more basic wm of your choice ) and a bunch of xterms but in KDE for  
instance you'll see occasional glitches in horizontal scroll bars.  
Anti-aliased text looks right even when drawn by hardware though. )

have fun
Michael

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