Re: Voyager GX color mapping

[Clemens Koller <clemens.koller@anagramm.de>]

Hello, Geert!

>>well, my version of the Silicon Motion SM501 driver works now
>>quite well on the PowerMac (after some data integrity problems
>>with the card having in a dusty PCI slot. :-(( )
>>
>>Only one thing is missing: The color mapping in the
>>32bit mode doesn't fit with X. The fb memory map has a BGRA
>>color mapping but X11 writes it in RGBA.
>>
>>I have tried to change the fb_var_screeninfo.fb_bitfield
> 
> You should indeed make sure the fb_var_screeninfo.fb_bitfield values are
> correct.  BTW, have you tried fbtest to verify the correctness of your driver?
> You can check it out from CVS on SourceForge.

I got fbset already... thanks.

Well, whenever I change the (yet hardcoded) structs in the driver,
fbset -fb /dev/fb2 shows me the correct (changed) values.
But there is no change in X at all if I play around with the values.
Is it possible that X doesn't get my fb_var_screeninfo? Maybe I need
to check xorg.cfg again...
The same things happen in all 32bit (RGBA8888) as well as in
16bit (RGB565) modes (i haven't tried 8bit, as I don't need it).
Is this an PPC-endian related problem?
Is the SM501's BGRA mapping usual?
Hmm...

>>Where do I need to tweak to get it working?
> X should obey the fb_var_screeninfo.fb_bitfield values. If it doesn't, it's a
> bug in X.

Unlikely, I think?

I use a primary "ATI Radeon If" (fb0, fb1) on Depth 16 successfuly.
The SMI501 is the secondary graphics board (fb2) on Depth 16, 24, 32.
Does X listen only to the mapping of the primary card? I guess I will
get offtopic with the X questions.

Clemens Koller
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