[geeks] Thoughts re: PCI --> AGP upgrades

[Phil Brutsche]

Gregory Leblanc wrote:
> I haven't looked at how Apple uses AGP, but on x86 machines, the AGP
> slot isn't part of the PCI bus.  It gets piped off of the chipset at
> the same point as memory, and other busses.  I don't know whether it
> actually uses PCI commands or not.

It seems to, at least in part.

On every PC I've seen the OS sees the AGP slot as another PCI bus.

Take this slightly abrigded `lspci` example from a Linux PC:

00:00.0 Host bridge
00:01.0 PCI bridge
00:07.0 ISA bridge
00:07.1 IDE interface
00:07.2 USB Controller
00:07.3 Bridge
00:08.0 Ethernet controller
00:09.0 RAID bus controller
01:00.0 VGA compatible controller


-- 

Phil Brutsche
phil at tux.obix.com