Date: Sat, 8 Jul 2000 19:14:51 +0200 From: Wilko Bulte <wkb@chello.nl> To: "Kenneth D. Merry" <ken@kdm.org> Cc: wilko@FreeBSD.ORG, FreeBSD SCSI hackers <freebsd-scsi@FreeBSD.ORG> Subject: Re: adaptec 2940uw error message on -stable Message-ID: <20000708191451.A2191@freebie.wbnet> In-Reply-To: <20000706105933.A23871@panzer.kdm.org>; from ken@kdm.org on Thu, Jul 06, 2000 at 10:59:33AM -0600 References: <20000706082308.A2499@freebie.wbnet> <20000706105933.A23871@panzer.kdm.org>
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On Thu, Jul 06, 2000 at 10:59:33AM -0600, Kenneth D. Merry wrote: > On Thu, Jul 06, 2000 at 08:23:08 +0200, Wilko Bulte wrote: > > Hi > > > > I just saw: > > > > (da1:ahc0:0:1:0): SCB 0x2c - timed out in Data-in phase, SEQADDR == 0x114 > > (da1:ahc0:0:1:0): BDR message in message buffer > > (da1:ahc0:0:1:0): SCB 0x2c - timed out in Data-in phase, SEQADDR == 0x115 > > (da1:ahc0:0:1:0): no longer in timeout, status = 34b > > ahc0: Issued Channel A Bus Reset. 42 SCBs aborted > > (da1:ahc0:0:1:0): SCB 0x1b - timed out in Data-in phase, SEQADDR == 0x114 > > (da1:ahc0:0:1:0): BDR message in message buffer > > (da1:ahc0:0:1:0): SCB 0x1b - timed out in Data-in phase, SEQADDR == 0x114 > > (da1:ahc0:0:1:0): no longer in timeout, status = 34b > > ahc0: Issued Channel A Bus Reset. 44 SCBs aborted > > > > in my log files. This was while copying a couple of Gb from my IBM Ultrastar > > 18Gb to my newly acquired Cheetah 18LP 9Gb disk. I suspect the SCA-HD68 > > converter*), but I like comments on the error message. > > > > *) I know, SCA converters are not the best things to use. But I could get > > the Cheetah brand-new for only $60 + some surplus stuff I no longer used ;-) > > That's usually indicative of a cabling or termination problem. > > Essentially it means that the bus was stuck in data-in phase. The timeout > for reads and writes for the da(4) driver is 60 seconds, so it may have > been stuck in data-in phase for a while. It appears fixed now. This bleedin' SCA thing contributed a lot to the problem. <alert, hardware hack follows> What I did to make it usable: - Cut all unused etch traces (to the unused 50 pin header connector) - Using tweezers pull (and therefore remove) these traces from the PCB. This eliminates the very undesirable stubs on the signal lines. - *important* use heavy gauge litze (braided?) copper to make a *real* low impedance path for the signal ground. This PCB had ground routing from hell, a truly lousy job if I ever saw one.. - Saw the part off the PCB that had the 50pin connector. Use a sharp metal cutting saw. Now it works ;-) -- Wilko Bulte http://www.freebsd.org "Do, or do not. There is no try" wilko@freebsd.org http://www.nlfug.nl Yoda - The Empire Strikes Back To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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