[Xorg] The big multiconsole nasty
eich at pdx.freedesktop.org
Mon Jul 12 04:52:24 PDT 2004
Jon Smirl writes:
> While trying to fix the radeonfb driver, BenH has run into some laptops
> that take the system BIOS and VBIOS, put them into a single image,
> compress it, and put it into a ROM. They can do this because the video
> is build into the motherboard. I don't know how you are going to find
> this without help from the system or using the C000:0 copy.
With some tricks (possibly by using the BIOS system vectors) you can
often locate pages where the BIOS lives. Of course you can only use
the pre-POSTED copy which lives somehwere beween 0xc0000 and 0xfffff.
On these systems I have found that it is unwise to re-POST anyway
as this may lead to undesireable results. In the best case the video
BIOS tries to call into some vendor specific call in the system BIOS.
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