On Thu, May 15, 2003 at 01:24:12PM -0700, Jesse Barnes wrote: > > All devices I am aware of do not support 64-bit addresses for their > > descriptors, only 32-bit. > > PCI-X devices are required to support 64 bit addrs. They'll only > generate SAC if the top 32 bits are 0, but our platform is incapable > of handling this, since the IOMMU can't be used in PCI-X mode (i.e. we > need high order bits for PCI-X devices). I think you're missing Dave's point. While the card is required to support DAC that doesn't mean the device on the card is necessarily capable of being handed a full 64-bit address to DMA into. >From the way he's talking, I'd surmise tg3 is a good example -- I suspect the ring buffers only support 32-bit addresses. -- "It's not Hollywood. War is real, war is primarily not about defeat or victory, it is about death. I've seen thousands and thousands of dead bodies. Do you think I want to have an academic debate on this subject?" -- Robert FiskReceived on Thu May 15 14:30:30 2003
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