From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Mosberger Date: Wed, 06 Sep 2000 21:11:33 +0000 Subject: Re: [Linux-ia64] 64 bit PCI DMA transfers? Message-Id: List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org >>>>> On Wed, 6 Sep 2000 12:29:19 -0700 (PDT), Nelson Escobar said: Nelson> Doing 64 bit PCI DMA transfers to memory less than 2 gigs Nelson> works fine. When I use 4 gigs of memory, the physical Nelson> address of the last 2 gigs seems to be 0x100000000 - Nelson> 0x17fffffff. When I try doing PCI DMA transfers into this Nelson> area, everything starts going wrong. Nelson> Is this a problem with the kernel? Or is it a problem with Nelson> my driver? or both? The kernel should handle this fine and if your driver is using the PCI DMA interface, then it should work, too (assuming it's using it correctly). --david