Re: [Linux-fbdev-devel] Reading the EDID block for x86 machines

[Jon S. <jon...@ya...>]

--- Antonino Daplas <ad...@po...> wrote:
> Unless I missed some imported BIOS calls or other
> methods to do this or
> something similar in real-mode...

You missed something. The address of the VBIOS ROM can
be controlled by writing to the PCI config space. You
can make the ROM appear anywhere you want it to.

This happens even for the boot video device. 
Somewhere very early in the boot the system BIOS
enabled the VBIOS ROM and copied it to C000. This is
the "shadow BIOS" option.



=====
Jon Smirl
jon...@ya...

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