[H-GEN] question

[Mike Andrew]

[ Humbug *General* list - semi-serious discussions about Humbug and
Unix-related topics. ]

On Tue, 02 Nov 1999, Rob Kearey wrote:
 
> Bollox et omnes, Byron. Check out the Matrox GLX mailing list for more

on the subject of AGP in general. It is not recognised by Linux. These cards
are treated as PCI, it is only a flag or two in the (struct) pci->headers that
indicate the 'slot' is AGP and therefore can be used in an 'enhanced'
manner should the driver choose to do so, and Linux chooses not to. (actually
the Xfree server and cousins).

Someone here made an interesting post about video timings and bus speeds
relevant to AGP. My query to them is, is this relevant under Linux? Is it a
hardware function of simply being AGP that gets you to 133Mhz bus access (plus
all the other goodies) or do you need to 'turn it on' ? If the latter, it's not
accounted for in Linux.

Someone else said (paraphrasing) "the ISA and PCI busses are directly connected,
the AGP is not". This is a complete reverse of the truth. The ISA bus is
totally isolated from pci (and the cpu), the AGP is not, it *is* a pci device.



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