From: Colin Ngam <cngam@sgi.com> Date: Thu, 15 May 2003 18:25:54 -0500 Actually, our system does not have Physical Memory Address smaller than 48Bits - give or take couple bits ... Hence, 32Bits Mapped DMA address maps to 48Bits System Physical Address. If you support mapping 32-bit DMA bus spaces to the full 48-bit physical memory spaces, then why do you even need >4GB addressing? Saying that PCI-X devices can only generate DAC cycles is bogus, I have PCI-X tg3 cards in my systems and they function just fine. Or does this rule only apply when the device is on a PCI-X bus? This all sounds seriously broken to me, I thought the issue was that a) the addresses could not be translated, it was direct phys-->virt and b) you can't guarentee that the physical address of memory allocated on any particular node is <4GB.Received on Thu May 15 16:49:17 2003
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