Date: Tue, 25 Feb 1997 20:26:22 +0100 From: se@freebsd.org (Stefan Esser) To: nik@blueberry.co.uk (Nik Clayton) Cc: hackers@freebsd.org Subject: Re: 2.1.7: ncr and de driver increasingly fickle Message-ID: <19970225202622.HX00195@x14.mi.uni-koeln.de> In-Reply-To: <19970225164635.47646@coconut.blueberry.co.uk>; from Nik Clayton on Feb 25, 1997 16:46:35 %2B0000 References: <19970225164635.47646@coconut.blueberry.co.uk>
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On Feb 25, nik@blueberry.co.uk (Nik Clayton) wrote: > Hi, > > Has anyone else noticed an increased fickleness on 2.1.7 with the ncr and > the de drivers? > > On my 2.1.5 system, I never heard a complaint from the de driver, and the > ncr driver might occasionally complain > > /kernel: sd1(ncr0:1:0): extraneous data discarded. Well, this is not a problem caused by the driver, IMHO ... The number of data transfers requested by the target did not match the transfer count. This normally indicates SCSI cable problems, since it means either zero or two bytes have been sent in a previous bus phase. For synchronous transfers, you may also receive a gross error in such situations. It is caused by a FIFO over- or underflow as a result of a lost or doubled byte ... The driver just counts the bytes transfered, and notices the mismatch ... Regards, STefan
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