Re: AGP Chipset Support

Rui Sousa (rsousa@grad.physics.sunysb.edu)
Mon, 5 Jul 1999 19:31:07 -0400 (EDT)

>
> That's not really a stupid question in the context of user space graphics
> drivers, but I'm playing with kernel level abstraction (much like fbcon or
> kgi) and one thing that interested me was getting AGP DMA to work + a few of
> the other AGP specific functions.
>
> As I understand it this involves some tweeking or the host chipset to set up
> (although it looks like the BIOS should do this at start of day). Also there
> is a address translation table called the GART which can be used for
> scatter-gather type operations (although I'm informed Intel is not telling
> anybody about how to use this at the moment).
>
> And finally I've heard that any memory allocated which is going to be read
> by AGP DMA has to be a special type.
>
> You may notice that my above comments sound a little unsure of themselves.
> That's because all of my information comes from people writing drivers under
> Windows (NT or 95/8) so I don't know if these issues are really hardware
> issues or MS-isms because they've (for example) decided to allocate AGP
> memory out of a different pool.
>
> So I was just looking for people who may have already touched on it.
>

You might want to have a look at :

http://glx.on.openprojects.net/

namely at the mailing-list archive:

http://lists.openprojects.net/pipermail/g200-dev/

Or post your questions on the list...

I can't help you but maybe some of those guys can.

Rui Sousa

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