Messages in this thread | | | From | Rui Sousa <> | Subject | Re: AGP Chipset Support | Date | Mon, 5 Jul 1999 19:31:07 -0400 (EDT) |
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> > 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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