On Fri, 12 Jul 2002 [EMAIL PROTECTED] wrote:
> Hello Mark and Xpert list
>
> Do you happen to have an email address for Egbert Eich handy?
eich <at> XFree86.Org
>
> Actually I already have the two video cards working as I suggested
> in my previos email. To do so took a lot of work. And to do so I
> needed to get a datasheet from ATI to accomplish control of the AGP
> card via my kernel module. This limits me to the ATI Radeon 7500 card
> only. I would like to branch out to other cards as well in case
> ATI can not continue provide me with docs for their newer cards.
> So now I am wondering if their exists a way to write to the legacy
> ports using an address something like
>
> base_address + legacy_port_offset
Some cards work that way. Matrox at least. NVIDIA doesn't work
that way, pieces of vga (crtc, sequencer, etc...) are intact but
spread around.
>
> where legacy address would possibly be obtained from PCI config-space.
That sort of thing isn't in the PCI config space. There is
no standard way to access vga registers via mmio between vendors.
And some vendors don't provide a way other than legacy access.
Mark.
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