[Linux-ia64] Re: 64 Bits DMA Addresses for Alloc Consistent Interfaces.

Grant Grundler
2003-05-16T18:23:41Z

On Thu, May 15, 2003 at 11:47:55PM -0700, Jeremy Higdon wrote:
> Certainly all PCI-X devices should support
> 64 bit addresses for descriptors.

I finally found the bit in the PCI-X spec hat mentions this:
(Section 1.8 "Bus Width")
| The following PCI-X requirements are different from conventional PCI:
| 1. All devices that initiate memory transactions must be capable of
| generating 64-bit addresses.
| 2. Each device includes a configuration status bit that indicates
| the width of that device's interface.

PCI-X also has a different command set.
It's definitely NOT just a PCI bus speed up.

thanks,
grant