On Sun, 6 Aug 2000, Warner Losh wrote:
>In message <[EMAIL PROTECTED]> Warner Losh writes:
>: The reason you have a ISA to PCI bridge still is that the serial
>: ports, parallel ports, floppy, keyboard and mouse devices still live
>: on the ISA bus. They aren't full PCI nodes just yet in most hardware
>: designs (I've yet to see a floppy, keyboard or mouse on the pci bus,
>: but I'm sure people will tell me where I can find such beasts).
>
>I should have also added:
>
>Even though there are no ISA expansion slots on your machine, you
>still have an ISA bus living inside (unless it is a legacy free
>machine we keep hearing about, which I didn't think was on the
>market). The PC-99 standard (not to be confused with the Japanese
>PC-98 machines) states that you cannot have a ISA expansion slot, but
>a later clarification to the standard states clearly that you can
>still have ISA devices built into the mother board.
>
>In other words, No ISA slots doesn't necessarily mean that the machine
>doesn't have an ISA bus.
Well, I understand that, my question is, why are true PCI devices like
video controllers still shown as being on isa0 by the kernel? I wanted
an explanation of that. That's what doesn't make sense to me. Perhaps
there's a valid PC/AT hardware limitation reason for it. Otherwise it
seems silly. =)
Brandon D. Valentine
--
bandix at looksharp.net | bandix at structbio.vanderbilt.edu
"Truth suffers from too much analysis." -- Ancient Fremen Saying
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