[coreboot] [SeaBIOS] Data exchange between coreboot - seabios - option rom

Kevin O'Connor kevin at koconnor.net
Thu Aug 23 06:18:30 CEST 2012

On Wed, Aug 22, 2012 at 04:13:29PM +0200, Christian Gmeiner wrote:
> 2012/8/22 Kevin O'Connor <kevin at koconnor.net>:
> > I'm not sure I fully understand your requirements.  Will the board
> > truly have different flat screens hooked up to it?  One can't simply
> There are different screens (timing and resolution) connected to the device.
> > compile the EPI info into the BIOS?  Also, if you have to interrogate
> > the display via i2c, can you simply fully generate the EPI info in the
> > vgabios at runtime?
> After some time of hacking I came up with the following solution.
> 1) Reserve 128 byte in SeaVIDOEBIOS (between ROM haeder and entry points)
> 2) Add all needed epi files to cbfs
> 3) Add possibility to patch vbios during loading based on i2c content
> - see http://review.coreboot.org/#/c/1478/

Why read the i2c and then patch the vgabios - why not just have the
vgabios read from i2c directly?

> 4) Extend vbios to make use of epi/edid data by writing a simple parser
> 5) Extend VBE
> 6) Extend geode code in vbios to make use of parsed epi/edid data


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