Re: [SeaBIOS] VGA Callback function in SeaBIOS

[Rudolf Marek]

> I want to implement a Callback Function (04E08H- System BIOS INT 15H) for the
> AMD Video vBIOS (ATOM BIOS Extension Functions)
>
> to support LVDS TFT Displays with AMD G-Series processors (Persimmon mainboard).

Is there any freely accessible documentation? Do you know if VBIOS calls this? I 
tried to investigate if mine video BIOS is doing any calls but if I recall 
correctly i havent seen that. I have some trouble with flicker during FID/VID 
changes any clue here?
> What is the best way to do this in SeaBIOS?

I guess just implementing that.
> I need some parameter like UMA base and size from Coreboot. How can I transfer
> this information from Coreboot to SeaBIOS?

Read the config out of the hardware if possible.
Check gfx.c in coreboot how to do that.

Thanks
Rudolf
> Thanks,
>
> Wolfgang
>
> SeaBIOS mailing list
> [e-mail]
> http://www.seabios.org/mailman/listinfo/seabios

VGA Callback function in SeaBIOS

[Marc Jones]

On Tue, Nov 22, 2011 at 11:11 AM, Rudolf Marek  wrote:
> > I want to implement a Callback Function (04E08H- System BIOS INT 15H) for
> > the
> > AMD Video vBIOS (ATOM BIOS Extension Functions)
> >
> > to support LVDS TFT Displays with AMD G-Series processors (Persimmon
> > mainboard).
>
> Is there any freely accessible documentation? Do you know if VBIOS calls
> this? I tried to investigate if mine video BIOS is doing any calls but if I
> recall correctly i havent seen that. I have some trouble with flicker during
> FID/VID changes any clue here?
> > What is the best way to do this in SeaBIOS?
>
> I guess just implementing that.
> > I need some parameter like UMA base and size from Coreboot. How can I
> > transfer
> > this information from Coreboot to SeaBIOS?
>
> Read the config out of the hardware if possible.
> Check gfx.c in coreboot how to do that.
>
> Thanks
> Rudolf

I'm not sure all these links are still good, but there is some public
info about the atombios.

The AtomBIOS disassembler is available at :
http://cgit.freedesktop.org/~mhopf/AtomDis/

Matthias' blog post with instructions is at :
http://emmes.livejournal.com/3678.html

The most current atombios.h file version is usually the one in the
kernel driver maintainer's drm-radeon-testing tree, which is at :
http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=tree;f=drive...
> > Thanks,
> >
> > Wolfgang
> >
> > SeaBIOS mailing list
> > [e-mail]
> > http://www.seabios.org/mailman/listinfo/seabios
>
> SeaBIOS mailing list
> [e-mail]
> http://www.seabios.org/mailman/listinfo/seabios