Date: Wed, 4 Apr 2001 13:19:46 -0500 From: Dave Duchscher <daved@tamu.edu> To: Tim Joseph <tim@weeble.org.uk> Cc: freebsd-questions@FreeBSD.ORG Subject: Re: U/DMA disabled? Message-ID: <20010404131946.A29081@net.tamu.edu> In-Reply-To: <20010404113819.K25682-100000@doubtful.weeble.foo.uk>; from tim@weeble.org.uk on Wed, Apr 04, 2001 at 11:45:39AM %2B0100 References: <20010404113819.K25682-100000@doubtful.weeble.foo.uk>
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--Kj7319i9nmIyA2yE Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable I believe this just means that the ata driver timed out talking to the drive. It reset things, found the drive again and went on its way. It is still should be talking to the drive using DMA. You can alway check to see if the drive is DMA or PIO mode by sysctl. sysctl hw.atamodes See the ata man page for more details. BTW, this a known problem with some of the older IBM-DTTA drives (maybe even newer). They spin down at least once a week for some maintenance purpose and if the machine tries to access the drive during this time, the drive does not respond quick enough and you get these messages. Hope this helps, DaveD On Wed, Apr 04, 2001 at 11:45:39AM +0100, Tim Joseph wrote: > Hi, >=20 > I just got this message on my xconsole: >=20 > ad0: READ command timeout tag=3D0 serv=3D0 - resetting > ata0: resetting devices .. done >=20 > Does this mean that U/DMA has been switched off on ad0? If so, what > can/should I do about it? >=20 > Here are some bits from my dmesg (just to be brief): >=20 > FreeBSD 4.3-RC #0: Fri Mar 30 22:33:00 BST 2001 > pcib0: <AcerLabs M1541 (Aladdin-V) PCI host bridge> on motherboard > pci0: <PCI bus> on pcib0 > pcib1: <AcerLabs M5243 PCI-PCI bridge> at device 1.0 on pci0 > pci1: <PCI bus> on pcib1 > atapci0: <AcerLabs Aladdin ATA33 controller> port 0xffa0-0xffaf irq 0 at > device 15.0 on pci0 > ata0: at 0x1f0 irq 14 on atapci0 > ata1: at 0x170 irq 15 on atapci0 > ad0: 9641MB <IBM-DTTA-371010> [19590/16/63] at ata0-master UDMA33 > ata1-master: Aladdin: two atapi devices on this channel, no DMA > acd0: CDROM <TOSHIBA CD-ROM XM-6302B> at ata1-master using PIO4 > ata1-slave: Aladdin: two atapi devices on this channel, no DMA > afd0: 96MB <IOMEGA ZIP 100 ATAPI> [32/64/96] at ata1-slave using PIO0 > Mounting root from ufs:/dev/ad0s1a >=20 > Thanks in advance for your help. >=20 > From, >=20 > Tim >=20 >=20 > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message --Kj7319i9nmIyA2yE Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: PGPfreeware 5.0 for non-commercial use MessageID: kYptgzOFUGNXSuv9S9T1kaRImOSzWZH8 iQCVAwUBOstlwPsJYFdBGj/VAQG4QwP/fwwlN3n+XGHYpBaynwCdUeRMGfAWuyoc n3IJmxfY/EgKM19jGR81FDVR6B2oFSJbTOkMKKOLpBiJBBacGOE7BDeMkJ7v3ejG CzyzWHsV8JKly7jieCvjnApiTA0xWOiYupz0hBZCpjkABGOuMGlGcctjiPuFO619 Aqti2C0v11Y= =zjQn -----END PGP SIGNATURE----- --Kj7319i9nmIyA2yE-- To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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