From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: libata and PATA devices Date: Sat, 13 Aug 2005 12:44:48 -0400 Message-ID: <42FE2380.5040508@pobox.com> References: <200508071949.03782.inform@tiker.net> <42F6B8CD.4050100@gmail.com> <20050808030239.GA27502@havoc.gtf.org> <1123495856.22328.62.camel@localhost.localdomain> <42F8B41C.4040408@rtr.ca> <42FACCA8.6050408@pobox.com> <42FB853E.4070100@rtr.ca> <42FB889F.50607@pobox.com> <1123789132.4422.30.camel@localhost.localdomain> <42FBB33D.8050003@pobox.com> <1123932640.4378.10.camel@localhost.localdomain> <42FE12D6.1070600@pobox.com> <1123948250.11048.9.camel@localhost.localdomain> <42FE1828.4000104@pobox.com> <1123949005.11048.16.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail.dvmed.net ([216.237.124.58]:41904 "EHLO mail.dvmed.net") by vger.kernel.org with ESMTP id S932195AbVHMQow (ORCPT ); Sat, 13 Aug 2005 12:44:52 -0400 In-Reply-To: <1123949005.11048.16.camel@localhost.localdomain> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Erik Slagter Cc: linux-ide@vger.kernel.org, Mark Lord Erik Slagter wrote: > On Sat, 2005-08-13 at 11:56 -0400, Jeff Garzik wrote: > >>>Nope. The harddisk is not SATA, it's PATA. See the links I posted >>>earlier. That's the whole point. >> >>The controller thinks its a SATA device, so there is probably a bridge >>installed. > > > I suppose it's something like that. > > It's all very confusing. > > E.g. that would mean I must treat my PATA harddisk as if it's a SATA > harddisk, but on the other hand, it's not really a SATA disk, so I > cannot use SATA features. > > Maybe an idea to spend a few words on the matter, including the way > you're supposed to configure the kernel for this setup. Sounds like you've hit on the configuration, in the previous email. Yes, it does mean no DMA for the DVD drive. > BTW afaik you won't be able be able to control DMA on the dvd drive with > this setup, so I'll stick to my patched kernel for the moment (= both > disk&cdrom are assigned to ide). That's normal for combined mode. Until libata can do ATAPI (soon!), the lack of DMA is a necessary evil, since two drivers are trying to claim two halves of the same hardware. Jeff