Re: Unknown mode ID. Try again.

Alan Cox (alan@lxorguk.ukuu.org.uk)
Tue, 11 Aug 1998 17:42:53 +0100 (BST)

> it's just a guess so I don't know that it actually works), but I bet the
> card supports a linear framebuffer and all you need is its address. If
> you can get that (say, the user reads /proc/bus/pci, finds out where the
> card's memory is and supplies it in an option to LILO) then you could
> at least pretend that VBE 1.2 supports a linear frame buffer.

For many cards you also have to know how to enable it, the offset of
the actual frame buffer and its encoding. As an example its not uncommon
to have both big and little endian mappings of the video memory on the
bus. Indeed some cards even have areas that do hardware YUV->RGB maps
if you write into the YUV area

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