From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262128AbTD2Sl7 (ORCPT ); Tue, 29 Apr 2003 14:41:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262131AbTD2Sl7 (ORCPT ); Tue, 29 Apr 2003 14:41:59 -0400 Received: from adsl-68-74-104-142.dsl.klmzmi.ameritech.net ([68.74.104.142]:53511 "EHLO tabriel.tabris.net") by vger.kernel.org with ESMTP id S262128AbTD2Sl5 (ORCPT ); Tue, 29 Apr 2003 14:41:57 -0400 From: Tabris To: linux-kernel@vger.kernel.org Subject: Re: 2.4.21-rc1-ac2 Promise IDE DMA won't work Date: Tue, 29 Apr 2003 14:48:07 -0400 User-Agent: KMail/1.5 Cc: Thomas Backlund References: <200304282112.47061.tabris@sbcglobal.net> In-Reply-To: <200304282112.47061.tabris@sbcglobal.net> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200304291448.07909.tabris@sbcglobal.net> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > On Monday 28 April 2003 09:58 pm, Andre Hedrick wrote: >> NO ATAPI DMA! >> >> I will not write the driver core to attempt to support the various >> combinations. The ATAPI DMA engine space is used support 48bit. >> Use the onboard controller for ATAPI. >> Andre Hedrick >> LAD Storage Consulting Group > > Can I object that it came built onto the board? okok... i'll take that > as a no for now... > >> Tho i'm still not quite sure how it makes a diff to be honest, unless >> you mean that the Promise and HPT will never be supported for DMA? >> >> and the only other thing i should say is that altho i'm not exactly a >> n00b, the average user WILL expect it to work. >> >> can i expect this to be fixed by 2.6? (yeah, i know... 2.4-ac-ide >>code is similar to 2.5-ide code) >> -- >> tabris >The point is that you should put your ATAPI device (in this case the >cd-rom) >on the VIA controllers, and place the hdd's on the promise controller, >since dma is supported for hdd's... >This is also their intended primary functions by the manufacturers..., >for example the HPT370 controller with bios version >1.1.x.xxx does >not have ATAPI support (atleast officially, I haven't tried it) > > >Thomas So, are you telling me that DMA for both my hard drives, and my CD-R/Ws will work, if i put my HDs on the PDC20265 controller, and my CD-R/W on the VIA? or will i lose DMA on the hard drives in this way, losing performance? the second solution, tho one _I_ could probably live with, is still a problem, especially for those of us who want to sell GNU/Linux to our customers as a 'better' solution. btw, please cc: me in your replies, as I no longer am able to subscribe to the linux-kernel list. this reply i had to hack by hand from marc.theaimsgroup -- tabris - Why don't you fix your little problem... and light this candle? -- Alan Shepherd, the first man into space, Gemini program