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

From: David S. Miller <davem_at_redhat.com>
Date: 2003-05-16 10:17:20
   From: Colin Ngam <cngam@sgi.com>
   Date: Thu, 15 May 2003 18:57:09 -0500
   
   It is in the PCI-X Spec that all PCI-X devices in PCI-X Mode have
   to support DAC.

Having to support DAC cycles does not mean that it must support full
64-bit DMA addresses in it's descriptors.

A cost sensitive PCI-X device may wish to use 32-bit addressing in
it's descriptors in order to keep pin counts down etc.
Received on Thu May 15 17:20:17 2003

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