From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1946760AbXD3UVO (ORCPT ); Mon, 30 Apr 2007 16:21:14 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1946764AbXD3UVN (ORCPT ); Mon, 30 Apr 2007 16:21:13 -0400 Received: from mail.electro-mechanical.com ([216.184.71.30]:61178 "EHLO mail.electro-mechanical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1946760AbXD3UVK (ORCPT ); Mon, 30 Apr 2007 16:21:10 -0400 Date: Mon, 30 Apr 2007 16:21:07 -0400 From: William Thompson To: Tejun Heo Cc: linux-kernel@vger.kernel.org Subject: Re: 2.6.20 libata cdrom Message-ID: <20070430202107.GF5942@electro-mechanical.com> References: <20070427175205.GD7809@electro-mechanical.com> <4635C35D.1020807@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4635C35D.1020807@gmail.com> User-Agent: Mutt/1.5.13 (2006-08-11) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Apr 30, 2007 at 12:22:21PM +0200, Tejun Heo wrote: > William Thompson wrote: > > I've been playing with libata on a few machines and I found that this machine > > (An old Dell Dimension L866r) gives me this when it loads and does not give me > > access to the cdrom. This is the only machine that I've tested that I know > > for a fact cannot do DMA on the cdrom. I searched and noticed a similar > > problem with 2.6.19-rc versions but I'm not sure if it's the same problem. > > > > dmesg output: > > libata version 2.00 loaded. > > ata_piix 0000:00:1f.1: version 2.00ac7 > > PCI: Setting latency timer of device 0000:00:1f.1 to 64 > > ata1: PATA max UDMA/66 cmd 0x1F0 ctl 0x3F6 bmdma 0xFFA0 irq 14 > > ata2: PATA max UDMA/66 cmd 0x170 ctl 0x376 bmdma 0xFFA8 irq 15 > > scsi0 : ata_piix > > ata1.00: ATA-4, max UDMA/33, 10018890 sectors: LBA > > ata1.00: ata1: dev 0 multi count 16 > > ata1.00: configured for UDMA/33 > > scsi1 : ata_piix > > ata2.00: failed to IDENTIFY (I/O error, err_mask=0x1) > > Hmm... IDENTIFY failed on the second port. How reproducible is the > problem? Every time? Does it work with the IDE driver? If so, please > post the result of 'hdparm -I /dev/hdX'. Reproducible? Everytime Yes, it works fine with the IDE driver, so long as DMA is disabled. hdparm -I: /dev/hdc: ATAPI CD-ROM, with removable media Model Number: Lite-On LTN483S 48x Max Serial Number: Firmware Revision: PD02 Standards: Used: ATAPI for CD-ROMs, SFF-8020i, r2.5 Supported: CD-ROM ATAPI-1 Configuration: DRQ response: <=10ms with INTRQ Packet size: 12 bytes Capabilities: LBA, IORDY(can be disabled) DMA: sdma0 sdma1 sdma2 mdma0 mdma1 mdma2 udma0 udma1 *udma2 Cycle time: min=120ns recommended=120ns PIO: pio0 pio1 pio2 pio3 pio4 Cycle time: no flow control=120ns IORDY flow control=120ns