Re: 2.6.6-mm5

[Roland Dreier]

    Eric> If no hardware actually cared or someone could show me that
    Eric> you can't generate a 64bit memory I/O cycle on the PCI bus
    Eric> that would be interesting.  I have seen several drivers that
    Eric> care.  Later today I intend to look at my pci docs and
    Eric> confirm that 64bit I/O cycles do exist on the bus, even in
    Eric> 32bit slots.  PCI bus traffic is packet based so I would be
    Eric> strongly surprised if 64bit cycles did not exist.

Hang on -- how could you generate a 64-bit cycle on a 32-bit PCI bus?
By definition a 32-bit PCI bus can only transfer 32 bits per cycle.

PCI Express traffic is packet based but parallel PCI definitely is not.

 - Roland

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