83 lines
3.1 KiB
Groff
83 lines
3.1 KiB
Groff
.\" $NetBSD: wdsc.4,v 1.3 2002/01/15 01:50:17 wiz Exp $
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.\"
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.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
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.\" All rights reserved.
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.\"
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.\" This code is derived from software contributed to The NetBSD Foundation
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.\" by Steve C. Woodford.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the NetBSD
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.\" Foundation, Inc. and its contributors.
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.\" 4. Neither the name of The NetBSD Foundation nor the names of its
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.\" contributors may be used to endorse or promote products derived
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.\" from this software without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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.\" POSSIBILITY OF SUCH DAMAGE.
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.\"
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.Dd November 28, 1999
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.Os
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.Dt WDSC 4 mvme68k
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.Sh NAME
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.Nm wdsc
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.Nd Western Digital WD33c93 SCSI Bus Interface Controller
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.Sh SYNOPSIS
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.Cd "wdsc0 at pcc? ipl 2"
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.Sh DESCRIPTION
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The
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.Nm
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driver provides an abstraction layer between the SCSI hardware
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fitted to the
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.Tn Motorola
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MVME147 single board computer (WD33C93), and the machine
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independent SCSI drivers described in
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.Xr scsibus 4 .
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.Pp
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In addition to sending the required SCSI commands to
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target devices on the SCSI bus, the
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.Nm
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driver deals with DMA, device interrupts, sync/async negotiation
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and target disconnects/reconnects.
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.Sh DIAGNOSTICS
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Too many to mention.
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.Sh SEE ALSO
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.Xr pcc 4 ,
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.Xr scsibus 4
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.Sh BUGS
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Negotiation of Synchronous SCSI data transfers has been
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deliberately disabled in the MVME147's
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.Nm
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driver as it has proved extremely difficult to make it
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work reliably in this mode.
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.Pp
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The
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.Nm
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driver does not respond well to exceptional conditions
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caused by poor SCSI cabling and/or termination. In those
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instances the machine is likely to require a hard reset
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to recover.
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.Pp
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The current
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.Nm
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driver should be blown away and replaced with a machine independent
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version.
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