From mboxrd@z Thu Jan 1 00:00:00 1970 From: Grant Grundler Date: Sat, 17 Jan 2004 03:58:54 +0000 Subject: Re: dma restriction on Itanium 2 Message-Id: <20040117035854.GH18103@cup.hp.com> List-Id: References: <1074304095.6384.13.camel@kbiswas-dt.s2iotech.com> In-Reply-To: <1074304095.6384.13.camel@kbiswas-dt.s2iotech.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-ia64@vger.kernel.org Kallol, please continue to include the linux-ia64 list in your replies. On Fri, Jan 16, 2004 at 06:35:53PM -0800, Kallol Biswas wrote: > Yes, I was talking about under HP-UX. > > Just to verify, inability to do DMA over page boundary on PA-RISC > running HP-UX was a software limitation or hardware? You are saying > it was a hp-ux(software) limitation, right? Yes. HPUX has a similar interface for DMA mapping but a completely different VM subsystem. Linux guarantees contiguous physical blocks for multi-page memory allocations. HPUX does not. The linux DMA subsystem uses that assumption. I'm hoping someone who is better at decoding MCA data can take a quick look at the data you posted earlier. If no one else does by next week, I'll work on it then. grant