From mboxrd@z Thu Jan 1 00:00:00 1970 From: qdot@SAFe-mail.net Subject: Re: Problem: DMA on PIIX4 controller for LiteON 851S DVDRW Drive Date: Mon, 14 Jun 2004 12:13:46 -0400 Sender: linux-ide-owner@vger.kernel.org Message-ID: Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Received: from tapuz.safe-mail.net ([212.68.149.115]:63972 "EHLO tapuz.safe-mail.net") by vger.kernel.org with ESMTP id S263169AbUFNQNs (ORCPT ); Mon, 14 Jun 2004 12:13:48 -0400 List-Id: linux-ide@vger.kernel.org To: axboe@suse.de Cc: linux-ide@vger.kernel.org From: Jens Axboe > On Mon, Jun 14 2004, qdot@SAFe-mail.net wrote: > > Hi > > > > Sorry to bother you with such a question but I got into some sort of trouble with DMA settings on PIIX4 controller for LiteON 851S DVDRW Drive on Linux 2.6.6 (vanilla). > > > > When dma has been setup (either using bios, boot parameters or hdparm) on first access to drive system ends up with: > > > > Jun 14 11:50:10 valkyrie hdc: cdrom_decode_status: status=0x51 { DriveReady SeekCom > > plete Error } > > Jun 14 11:50:10 valkyrie hdc: cdrom_decode_status: error=0x40LastFailedSense 0x04 > > Looks like a hardware error (the sense indicates so), it might just not > like dma. Rather not hardware error. Works slowly, but reliably without DMA. Works with DMA on other controllers well. Works on usb-storage enclosure. Tomasz Mloduchowski