From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sun, 10 Jun 2001 15:43:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sun, 10 Jun 2001 15:43:35 -0400 Received: from temp20.astound.net ([24.219.123.215]:4356 "EHLO master.linux-ide.org") by vger.kernel.org with ESMTP id ; Sun, 10 Jun 2001 15:43:28 -0400 Date: Sun, 10 Jun 2001 12:43:44 -0700 (PDT) From: Andre Hedrick To: Stephen Mollett cc: linux-kernel@vger.kernel.org Subject: Re: No DMA with ATAPI devices on PDC20267 In-Reply-To: <01061020334400.00543@cantoris> Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 10 Jun 2001, Stephen Mollett wrote: > Greetings, > > When using ATAPI devices on a Promise Ultra100 (PDC20267), DMA is not > enabled. Is this a bug in the pdc202xx driver or a limitation of the chipset? > > eg. > With the drive attached to a VIA 82C686: > hdb: ATAPI 40X CD-ROM CD-R/RW drive, 8192kB Cache, UDMA(25) > > With the drive attached to an Ultra100: > hde: ATAPI 40X CD-ROM CD-R/RW drive, 8192kB Cache > > I have also tested this with a DVD-ROM and an LS-120 drive. Hard disks are > fine, however. > > Regards, > Stephen Mollett > Stephen, I can make it do DMA ATAPI, however I have to add the code that used the second DMA engine space. Andre Hedrick ASL Kernel Development Linux ATA Development ----------------------------------------------------------------------------- ASL, Inc. Toll free: 1-877-ASL-3535 1757 Houret Court Fax: 1-408-941-2071 Milpitas, CA 95035 Web: www.aslab.com