[SeaBIOS] Adding non standard VGA modes

[Bernhard Guillon]

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:
>
> http://www.osdever.net/FreeVGA/home.htm

Thank you for the information :)

I will read the code and the docu and try to add some other modes.

best regards,
Bernhard


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