On Sunday 05 June 2005 20:07, Vladimir Dergachev wrote: > >> My understanding is that dev->agp->base is the address where the AGP GART > >> mirrors the pieces of system RAM comprising AGP space. > > > > Yes, that's my understanding, too. But what is the Radeon's business knowing > > that address? Why does it need to know this address? I thought this was CPU > > address space, not card address space. > > Yes, however it is convenient to do so. > > The point is that AGP base address will not normally overlap the location > of system RAM. This is, of course, only reasonable for 32 bit systems..
I understand that part, but it's not what I meant. What I mean is this: You said, RADEON_MC_AGP_LOCATION is used to program where AGP is in the card's address space, and that's all fine and makes sense. However, we are *also* programming dev->agp->base into a register called RADEON_AGP_BASE. What is the meaning of that register? cu, Nicolai
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