1.\" $NetBSD: wdsc.4,v 1.3 2002/01/15 01:50:17 wiz Exp $ 2.\" 3.\" Copyright (c) 1999 The NetBSD Foundation, Inc. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to The NetBSD Foundation 7.\" by Steve C. Woodford. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 1. Redistributions of source code must retain the above copyright 13.\" notice, this list of conditions and the following disclaimer. 14.\" 2. Redistributions in binary form must reproduce the above copyright 15.\" notice, this list of conditions and the following disclaimer in the 16.\" documentation and/or other materials provided with the distribution. 17.\" 3. All advertising materials mentioning features or use of this software 18.\" must display the following acknowledgement: 19.\" This product includes software developed by the NetBSD 20.\" Foundation, Inc. and its contributors. 21.\" 4. Neither the name of The NetBSD Foundation nor the names of its 22.\" contributors may be used to endorse or promote products derived 23.\" from this software without specific prior written permission. 24.\" 25.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 26.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 27.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 28.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 29.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 30.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 31.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 32.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 33.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 34.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 35.\" POSSIBILITY OF SUCH DAMAGE. 36.\" 37.Dd November 28, 1999 38.Os 39.Dt WDSC 4 mvme68k 40.Sh NAME 41.Nm wdsc 42.Nd Western Digital WD33c93 SCSI Bus Interface Controller 43.Sh SYNOPSIS 44.Cd "wdsc0 at pcc? ipl 2" 45.Sh DESCRIPTION 46The 47.Nm 48driver provides an abstraction layer between the SCSI hardware 49fitted to the 50.Tn Motorola 51MVME147 single board computer (WD33C93), and the machine 52independent SCSI drivers described in 53.Xr scsibus 4 . 54.Pp 55In addition to sending the required SCSI commands to 56target devices on the SCSI bus, the 57.Nm 58driver deals with DMA, device interrupts, sync/async negotiation 59and target disconnects/reconnects. 60.Sh DIAGNOSTICS 61Too many to mention. 62.Sh SEE ALSO 63.Xr pcc 4 , 64.Xr scsibus 4 65.Sh BUGS 66Negotiation of Synchronous SCSI data transfers has been 67deliberately disabled in the MVME147's 68.Nm 69driver as it has proved extremely difficult to make it 70work reliably in this mode. 71.Pp 72The 73.Nm 74driver does not respond well to exceptional conditions 75caused by poor SCSI cabling and/or termination. In those 76instances the machine is likely to require a hard reset 77to recover. 78.Pp 79The current 80.Nm 81driver should be blown away and replaced with a machine independent 82version. 83