* real mode entry points for PCI BIOS
@ 2003-03-12 2:42 Jon Smirl
2003-03-12 3:30 ` Decoding DDC/EDID Jon Smirl
0 siblings, 1 reply; 2+ messages in thread
From: Jon Smirl @ 2003-03-12 2:42 UTC (permalink / raw)
To: Antonino Daplas; +Cc: fbdev
http://www.delorie.com/djgpp/doc/rbinter/ix/1A/B1.html
The class for video displays is 3
It should be possible to make this work. Do you have a
PCI video card that you can install along with an AGP
one? Future PCI-X allows as many video cards as you
want so we need something along these lines. This
would also solve a lot of problems in framebuffer
development.
The reset program I sent earlier shows how to disable
VGA ports and copy INT vectors, etc. It also shows how
to enable the ROMs (writing to PCI config space).
Video ROMs needs to be copied to RAM before being
executed or they won't run. The BIOS did this to the
primary adapter's ROM for you.
Is it possible to allocate an entire page for DDC
info? At 512 bytes that would support eight video
cards. When the framebuffer driver loads how is it
going to find the page with the DDC info? How does it
know which info goes to which card?
This approach should work crossplatform. The
equivalent code will need to be written for each architecture.
=====
Jon Smirl
jonsmirl@yahoo.com
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2003-03-12 2:42 real mode entry points for PCI BIOS Jon Smirl
2003-03-12 3:30 ` Decoding DDC/EDID Jon Smirl
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