Baslinux mailing list

[sindi keesan <keesan AT sdf.lonestar.org>]

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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keesan AT sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org