Adding non standard VGA modes
Hi all, I want to ask if it is possible to add non standard VGA modes like 800x480 to seabios vgabios implementation. I want to be able to use it for qemu. After looking at the code I am puzzeled about the "random numbers" e.g. [1]. Can you hint me to any documentation or books I can read to understand what they are doing? best regards, Bernhard 1 http://code.coreboot.org/p/seabios/source/tree/master/vgasrc/vgatables.c -- Scanned by MailScanner.
On Fri, Jul 15, 2011 at 01:42:43PM +0200, Bernhard Guillon wrote:
Hi all, I want to ask if it is possible to add non standard VGA modes like 800x480 to seabios vgabios implementation. I want to be able to use it for qemu. After looking at the code I am puzzeled about the "random numbers" e.g. [1]. Can you hint me to any documentation or books I can read to understand what they are doing?
The code is a port of the GPL'd vgabios: http://www.nongnu.org/vgabios/ I ported only the basic VGA functionality - non standard modes are in the "vesa" and "cirrus" branches of the code. It would be nice to port that over as well. The "magic" numbers are the register settings of the VGA adapter for various modes. Here's a link I have that has assorted info: http://www.osdever.net/FreeVGA/home.htm -Kevin
On Sun, 17 Jul 2011, Kevin O'Connor wrote:
On Fri, Jul 15, 2011 at 01:42:43PM +0200, Bernhard Guillon wrote:
Hi all, I want to ask if it is possible to add non standard VGA modes like 800x480 to seabios vgabios implementation. I want to be able to use it for qemu. After looking at the code I am puzzeled about the "random numbers" e.g. [1]. Can you hint me to any documentation or books I can read to understand what they are doing?
The code is a port of the GPL'd vgabios: http://www.nongnu.org/vgabios/
I ported only the basic VGA functionality - non standard modes are in the "vesa" and "cirrus" branches of the code. It would be nice to port that over as well.
The "magic" numbers are the register settings of the VGA adapter for various modes. Here's a link I have that has assorted info:
Thank you for the information :) I will read the code and the docu and try to add some other modes. best regards, Bernhard -- Scanned by MailScanner.
participants (2)
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Bernhard Guillon -
Kevin O'Connor