From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matt_Domsch@Dell.com Date: Fri, 06 Jul 2001 15:56:47 +0000 Subject: [Linux-ia64] RE: DMA memory limitation? Message-Id: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org > The important thing is that pci_alloc_consistent and the other PCI DMA > functions work as advertised on IA64. If you pass NULL to > pci_alloc_consistent, IA64 should give you an ISA DMA-able > address. If > you don't, you get a 32-bit PCI DMA address. Use of GFP_DMA is a > arch-specific detail, so don't let me confuse you there. Until recently, on IA-64, pci_alloc_consistent() given a NULL pci_dev would fault. It's been fixed in at least the most recent IA-64 patch. pci_map_single() and pci_map_sg() still have the same problem, as they dereference pci_dev w/o checking for NULL first. -- Matt Domsch Sr. Software Engineer Dell Linux Solutions www.dell.com/linux #2 Linux Server provider with 17% in the US and 14% Worldwide (IDC)! #3 Unix provider with 18% in the US (Dataquest)!