Date: Mon, 9 Aug 2004 09:13:26 -0600 From: Nathan Kinkade <nkinkade@ub.edu.bz> To: Stevan Tiefert <stevan.tiefert@freenet.de> Cc: questions@freebsd.org Subject: Re: How to disable UDMA for HDD? Message-ID: <20040809151326.GW782@gentoo-npk.bmp.ub> In-Reply-To: <200408091110.40243.stevan.tiefert@freenet.de> References: <200408091110.40243.stevan.tiefert@freenet.de>
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[-- Attachment #1 --] On Mon, Aug 09, 2004 at 11:10:40AM +0200, Stevan Tiefert wrote: > Hello, > > when I try to install FreeBSD 5.2.1 on my computer with HDD on ata0-master and > CD-ROM on ata0-slave I got five interessting messages during the > boot-process: > > ... > ad0: 4124MB <SAMSUNG VA34323A> [8938/15/63] at ata0-master UDMA33 > ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=8446347 > ad0: TIMEOUT - READ_DMA retrying (2 retries left) LBA=0 > ad0: WARNING - READ_DMA interrupt was seen but timeout fired LBA=8446347 > ad0: WARNING - READ_DMA interrupt was seen but taskqueue stalled LBA=8446347 > > then the computer stops and he resists in this state till now... > OpenBSD "downgrades" this DMA-thing automaticly and the CD-ROM seems not > supporting UDMA and I assume to set at bootphase 3 a device.hint but I don't > know which one? > > With regards > Mr. > Stevan Tiefert Here are the two pertinent sysctl variables for your ATA hard disk and CDROM, respectively: hw.ata.ata_dma: 1 hw.ata.atapi_dma: 0 These variables are read only once the kernel has been booted, so if you want to try setting them manually you'll have to put them into /boot/loader.conf as something like: hw.ata.ata_dma=0 Nathan -- PGP Public Key: pgp.mit.edu:11371/pks/lookup?op=get&search=0xD8527E49 [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) iD8DBQFBF5SWO0ZIEthSfkkRAnqEAKCb/zW2riiqmOsZ/vFNtJHKY854IgCgyVjq 4PPOeWPYmQ4UAIo59xal068= =APh9 -----END PGP SIGNATURE-----help
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