Date: Thu, 2 May 2002 12:35:31 +0200 From: Nils Holland <nils@daemon.tisys.org> To: Scott Robbins <scottro@nyc.rr.com> Cc: Patrik ?str?m <patrik@astrom.net>, freebsd-questions@FreeBSD.ORG Subject: Re: DMA problem fallback to PIO mode Message-ID: <20020502123531.B2834@daemon.tisys.org> In-Reply-To: <20020502004453.GA2338@scott2.homeunix.net>; from scottro@nyc.rr.com on Wed, May 01, 2002 at 07:44:53PM -0500 References: <Pine.BSF.4.32.0205020021400.52030-100000@styx.astrom.net> <20020502004453.GA2338@scott2.homeunix.net>
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On Wed, May 01, 2002 at 07:44:53PM -0500, Scott Robbins stood up and spoke: > > May 1 22:02:36 samuraj /kernel: ad1: DMA problem fallback to PIO mode > > May 1 22:02:41 samuraj /kernel: ad1c: hard error reading fsbn 5166688 of > > 258329 > > This is a common problem. 9 times out of 10, it can be fixed by > replacing your IDE cable with shielded 80 pin ATA 100 IDE cables. Indeed - and I can tell you that not all of these 80-pin seemingly ATA100-capable cables are the same. We once built a lot of identical machines using (if I remember correctly) Chaintech boards, using the cables supplied with them in order to connect UDMA100 HDDs from Western Digital. Although these IDE cables were 80pin, many of the machines we had built showed the above symptoms. When we replaced the (maunufacturer-supplied) IDE cables against our own ones, the problems were instantly gone. In the end, even though not all machines were affected, we still decided to put our own 80pin IDE cables in all of them ;-) Bottom line: If you get error messages like mentioned above, even though you are using an 80pin IDE cable that normally *should* be able to do UDMA100 without any problems, replacing the cable against another one is definately the first thing to do before suspecting something else to be broken ;-) Greetings Nils -- Nils Holland <nils@daemon.tisys.org> Ti Systems - http://www.tisys.org Addicted to computing since 1987 High on FreeBSD since 1996 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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