Date: Sun, 30 Jan 2000 10:02:58 -0800 (PST) From: Roger Marquis <marquis@roble.com> To: questions@FreeBSD.ORG Subject: Re: Adaptec 2940 B channel? Message-ID: <Pine.GSO.3.96.1000130094352.2528B-100000@roble2.roble.com> In-Reply-To: <bulk.33584.20000129171802@hub.freebsd.org>
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David Greenman <dg@root.com> wrote: > >I've got a FreeBSD 3.4 system with a 2940U2W and SCSI 3 hard drive > >attached to the A channel. This setup runs great until I attach a CDRW > >drive (YAMAHA CRW4416S) to channel B. The 2nd device causes it to > >hang just before the login prompt. > > The 2940U2W is a single channel controller, so there really isn't a "B" > channel. I think what you must be refering to is the single-ended connector. > Perhaps the termination isn't set properly on either the controller or the > drive? Perhaps this depends on your definition of dual channel. There is an "Ultra 2 segment" and a separate "Ultra segment" (see: http://www.adaptec.com/products/datasheets/specs/aha2940u2w.html ) which map to a single LUN. I suspect it has something to do with the kernel since the system sees both devices and boots correctly up to some point just before the login prompt, when it gets the bus timeout/reset errors. The kernel seems straightforward: options SCSI_DELAY=150 #Be pessimistic about Joe SCSI device controller ahc0 # AHA2940 and onboard AIC7xxx devices controller scbus0 # SCSI bus (required) device da0 # Direct Access (disks) device sa0 # Sequential Access (tape etc) device cd0 # CD device pass0 # Passthrough device (direct SCSI) device mcd0 at isa? port 0x300 bio irq 10 device matcd0 at isa? port 0x230 bio device scd0 at isa? port 0x230 bio Adaptec technical support also thinks it's software though they're not exactly Unix literate. -- Roger Marquis Roble Systems Consulting http://www.roble.com/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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