From owner-freebsd-current@FreeBSD.ORG Wed Mar 26 13:22:27 2003 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 7F73F37B404 for ; Wed, 26 Mar 2003 13:22:27 -0800 (PST) Received: from imo-d09.mx.aol.com (imo-d09.mx.aol.com [205.188.157.41]) by mx1.FreeBSD.org (Postfix) with ESMTP id 8C81E43F85 for ; Wed, 26 Mar 2003 13:22:26 -0800 (PST) (envelope-from BelletJr@aol.com) Received: from BelletJr@aol.com by imo-d09.mx.aol.com (mail_out_v34.21.) id n.157.1d8b9c29 (4362); Wed, 26 Mar 2003 16:22:10 -0500 (EST) From: BelletJr@aol.com Message-ID: <157.1d8b9c29.2bb37401@aol.com> Date: Wed, 26 Mar 2003 16:22:09 EST To: current@FreeBSD.ORG MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit X-Mailer: AOL 5.0 for Windows sub 113 X-Spam-Status: No, hits=-2.5 required=5.0 tests=NO_REAL_NAME,QUOTED_EMAIL_TEXT autolearn=ham version=2.50 X-Spam-Level: X-Spam-Checker-Version: SpamAssassin 2.50 (1.173-2003-02-20-exp) Subject: Re: "READ_BIG command timeout" on CDROM drive X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 26 Mar 2003 21:22:30 -0000 >> Hi all! >> >> When I read cdroms with fbsd 5.0, the following message appears in the >> console very often (it seems to happen with every cdrom I try): >> >>>acd0: READ_BIG command timeout - resetting >>>ata0: resetting devices .. >>>done >> >> >> It is repeated indefinitely and I can't kill -9 the process that is trying to >> read the cdrom. >> "umount -f /cdrom" also gets stuck and doesn't write any error messages. >> >> The driver in use is cd9660: RockRidge Extension. >> >> I have to reboot to have access to the cdrom drive again. And besides, the >> shutdown process does not end every time when the system is in this state. >> >> Is there a means to have access to the cdrom drive again without rebooting? >> I have not seen any bug report for this problem; am I right? > >Just wanted to report that I fixed this problem by adding: > >hw.ata.atapi_dma="1" # Run the CD-ROM/DVD in DMA mode > >to /boot/loader.conf. The system was trying to access the drive using >PIO4 rather than DMA and crapping out. I got the idea from another >thread today with the subject "playing mp3's and burning a cd". Just an >FYI. > >-Scott Thanks for the tip, Scott. I added the line to loader.conf, rebooted and verified the value with sysctl. After plenty of successful read accesses to cdroms, I was about to think it corrected the problem on my box too. But unfortunately, it occured again. It does not happen as often as before; it seems it happens only with cdroms holding errors. But the symptoms and the solution (shutdown and reboot) remain the same :-(