1.\" 2.\" Copyright (c) 1994 Christian E. Hopps 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 3. All advertising materials mentioning features or use of this software 14.\" must display the following acknowledgement: 15.\" This product includes software developed by Christian E. Hopps. 16.\" 4. The name of the author may not be used to endorse or promote products 17.\" derived from this software without specific prior written permission 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29.\" 30.\" $NetBSD: ahsc.4,v 1.8 2001/06/13 23:38:29 wiz Exp $ 31.\" 32.Dd August 31, 1994 33.Os 34.Dt AHSC 4 amiga 35.Sh NAME 36.Nm ahsc 37.Nd A3000 low level SCSI interface 38.Sh SYNOPSIS 39.Cd "ahsc0 at mainbus0" 40.Sh DESCRIPTION 41The 42.Tn Amiga 43architecture uses a common machine independent scsi sub-system 44provided in the kernel source. The machine independent 45drivers that use this code access the hardware through a 46common interface. (see 47.Xr scsibus 4 ) 48This common interface interacts with a machine dependent interface, 49such as 50.Nm ahsc , 51which then handles the hardware specific issues. 52.Pp 53The 54.Nm 55interface handles things such as DMA and interrupts as well as 56actually sending commands, negotiating synchronous or asynchronous 57transfers and handling disconnect/reconnect of SCSI targets. 58The hardware that 59.Nm 60uses is based on the WD33c93 SCSI chip. 61.Sh DIAGNOSTICS 62.Bl -diag 63.It sbicwait TIMEO @%d with asr=x%x csr=x%x 64The 33c93 code (sbic) has been waiting too long for a SCSI chip 65operation to complete. %d is the line in the source file 66.Pa amiga/dev/sbic.c 67at which the SCSI chip timed-out. Asr and csr are status registers 68within the SCSI chip. 69.It ahsc%d: abort %s: csr = 0x%02x, asr = 0x%02x 70A SCSI operation %s was aborted due to an error. 71.It ahsc%d: csr == 0x%02i 72A error has occurred within the SCSI chip code. 73.It ahsc%d: unexpected phase %d in icmd from %d 74The target described by 75.Sq from %d 76has taken the SCSI bus into a phase which is not 77expected during polled IO. 78.It ahsc%d: unexpected phase %d in icmd from %d 79The target described by 80.Sq from %d 81has taken the SCSI bus into a phase which is not 82expected during DMA IO setup. 83.El 84.Sh SEE ALSO 85.Xr scsibus 4 86.Sh HISTORY 87The 88.Nm 89interface first appeared in 90.Nx 1.0 91