From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mark Lord Subject: Re: [2.6 patch] select ATA_SFF Date: Thu, 24 Apr 2008 08:50:16 -0400 Message-ID: <48108208.8060302@rtr.ca> References: <20080421213147.GH2633@cs181133002.pp.htv.fi> <480DE3C4.5@ru.mvista.com> <480DE6F5.8060403@gmail.com> <480DE9E8.2070809@ru.mvista.com> <480DEB1F.5060500@gmail.com> <20080424123541.09e5ef96@the-village.bc.nu> <481080EA.7010107@ru.mvista.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from rtr.ca ([76.10.145.34]:3542 "EHLO mail.rtr.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752810AbYDXMuQ (ORCPT ); Thu, 24 Apr 2008 08:50:16 -0400 In-Reply-To: <481080EA.7010107@ru.mvista.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Sergei Shtylyov Cc: Alan Cox , Tejun Heo , Jeff Garzik , Adrian Bunk , linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org Sergei Shtylyov wrote: > Alan Cox wrote: > >>> Sergei Shtylyov wrote: > >>>>>> Jeff, Tejun, what "sff" in the file name actually means? Isn't >>>>>> it strange that the drivers lacking DMA support or not really >>>>>> compliant with SFF-8038i have to link with this file? > >>>>> Maybe it should be libata-tf and libata-bmdma, but sff (sans bmdma) >>>>> and bmdma is acceptable, hopefully, right? > >>>> What's sff sans bmdma? > >>> Supposed to be TF interface. IIRC, the SFF term was first from Alan >>> although it's entirely possible that I misunderstood it and used it >>> in the wrong way. Alan, can you please clear up the confusion? > >> The SFF/Intel spec is for PCI IDE (BMDMA or otherwise), so it covers and >> defines all the common bits of the IDE interface on PCI (and in defining >> the legacy interface conveniently documents the extended ST-412 interface >> used by ATA and "pre-ATA" IDE/EIDE controllers). > > If you mean SFF-8038i (which can indeed be named "SFF/Intel"), it > documents *only* BMDMA. If you mean something else, please be more > precise. .. The "Intel PCI IDE Controller Specification Revision 1.0 3/4/94" doesn't mention bmdma at all, but does document the taskfile register addresses. It defers to ATA-1 for actual taskfile descriptions/functionality, though. There's nothing particularly bad about the current naming we use, though. Cheers