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  • From: sindi keesan <keesan AT sdf.lonestar.org>
  • To: baslinux AT lists.ibiblio.org
  • Subject: Re: [BL] framebuffer kernel with matroxfb module
  • Date: Fri, 6 May 2005 22:11:50 +0000 (UTC)

On Fri, 6 May 2005, David Moberg wrote:

----- Original Message -----
From: "sindi keesan" <keesan AT sdf.lonestar.org>

I am still experimenting with the framebuffer kernel that David
Moberg compiled.

His kernel boots properly. I can then insmod fbcon-cfb4 followed
by insmod matroxfb (you need both in that order).

mode "640x480-60"
geometry 640 480 640 3276 8 This is 8-bit color at 640x480
timings 39683......
accel true The millenium module improves accel
rgba 8/0, 8/0, 8/0, 0/0 I need to change this part for xfbdev
endmode

Perhaps I can just copy this into the mode config file and manually add
800x600-60 (should the 60 be changed?) and rgba 16/0

You will need to recompute the timings. I will send you an example
fbset.conf after I have made it. The timings will be based upon
XFree86.

What are timings for? Can I find them online somewhere?


Does anyone know what fbcon-cfb4.o has to do with 8-bit color, if
anything? Or whether I need fbcon-cfb16.o for 16-bit color? David
provided modules for fbcon-cfb2.o and fbcon-cfb4.o. The latter was
needed by matroxfb. The former would insmod but I don't know what
it does. I think they are something to do with color depth in text
mode and I have 8-bit color with cfb4.

According to fbcon-cfb4.c itself, it is "Low level frame buffer
operations for 4 bpp packed pixels". About the only other thing that I
know is that the Linux console works with exactly 16 colors. Even with
framebuffer, 16 colors are all that are available. To access more,
a piece of software needs to write directly to the /dev/fb device,
instead of relying upon the basic TTY escape codes.

So why am I getting 8-bit color depth as default? At least that is what happens in X with xfbdev, and what is reported when I insmod matroxfb.
What do I do with cfb2 after insmodding it? In order to run the matrox at more than 8-bit color with fbset, do I also need the 8, 16, 24 and 32 modules?

David
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