Re: Video questions

On Tue, 6 Jul 1999, Joe Julicher wrote:

Now that things are working, how do I change the kernel to support
1600x1200 for the framebuffer.  I want the full Rage 2+ support.  So using
the MacOS to "Cheat" doesn't count.  vmode only allows up to mode 20 which
is 1280x1024 (if memory serves)  
I have a theory on how to change it.  If I use MacOS to "Cheat" and boot
with no video driver selected and then use nvmode to inspect the PRAM
setting I get the mode to be 105.  If I modify macmodes.h to include 105
and push the end of the list marker (currently at 99) out past 105 would
that work?

You can use fbset to program any arbitrary resolution, assumed your board
supports it (my RAGE II+ can do 1600x1200, but my monitor is only a 17" with
max. 92 kHz hsync).

Second question:
I want to start on a frame buffer driver for the RPC board.  I have the
board, it is setup.  Where is a good template for a frame buffer driver?
Does such a thing exist?  Should I learn all I can from the existing FB
drivers, and then write a template?  The 823 video controller is VERY
simple so it should not be much more work than what would be in example code.

drivers/video/tgafb.c is a good start for a simple driver that supports one
video mode only. Later you can add support for multiple modes. Check out the
slides of my talk at Linux Expo:

    http://www.cs.kuleuven.ac.be/~geert/Linux/Expo/

There exist other URLs, but I don't have them at hand here. If you have
questions, feel free to ask. You may want to join
linux-fbdev@vuser.vu.union.edu (controlled by majordomo).

Greetings,

						Geert

--
Geert Uytterhoeven                     Geert.Uytterhoeven@cs.kuleuven.ac.be
Wavelets, Linux/{m68k~Amiga,PPC~CHRP}  http://www.cs.kuleuven.ac.be/~geert/
Department of Computer Science -- Katholieke Universiteit Leuven -- Belgium



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