From mboxrd@z Thu Jan  1 00:00:00 1970
From: Grant Grundler <iod00d@hp.com>
Date: Fri, 16 May 2003 18:23:41 +0000
Subject: [Linux-ia64] Re: 64 Bits DMA Addresses for Alloc Consistent Interfaces.
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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