91 lines
3.3 KiB
Groff
91 lines
3.3 KiB
Groff
.\"
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.\" Copyright (c) 1994 Christian E. Hopps
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.\" All rights reserved.
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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 Christian E. Hopps.
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.\" 4. The name of the author may not be used to endorse or promote products
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.\" derived from this software without specific prior written permission
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $NetBSD: ahsc.4,v 1.8 2001/06/13 23:38:29 wiz Exp $
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.\"
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.Dd August 31, 1994
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.Os
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.Dt AHSC 4 amiga
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.Sh NAME
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.Nm ahsc
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.Nd A3000 low level SCSI interface
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.Sh SYNOPSIS
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.Cd "ahsc0 at mainbus0"
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.Sh DESCRIPTION
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The
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.Tn Amiga
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architecture uses a common machine independent scsi sub-system
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provided in the kernel source. The machine independent
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drivers that use this code access the hardware through a
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common interface. (see
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.Xr scsibus 4 )
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This common interface interacts with a machine dependent interface,
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such as
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.Nm ahsc ,
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which then handles the hardware specific issues.
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.Pp
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The
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.Nm
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interface handles things such as DMA and interrupts as well as
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actually sending commands, negotiating synchronous or asynchronous
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transfers and handling disconnect/reconnect of SCSI targets.
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The hardware that
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.Nm
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uses is based on the WD33c93 SCSI chip.
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.Sh DIAGNOSTICS
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.Bl -diag
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.It sbicwait TIMEO @%d with asr=x%x csr=x%x
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The 33c93 code (sbic) has been waiting too long for a SCSI chip
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operation to complete. %d is the line in the source file
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.Pa amiga/dev/sbic.c
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at which the SCSI chip timed-out. Asr and csr are status registers
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within the SCSI chip.
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.It ahsc%d: abort %s: csr = 0x%02x, asr = 0x%02x
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A SCSI operation %s was aborted due to an error.
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.It ahsc%d: csr == 0x%02i
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A error has occurred within the SCSI chip code.
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.It ahsc%d: unexpected phase %d in icmd from %d
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The target described by
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.Sq from %d
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has taken the SCSI bus into a phase which is not
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expected during polled IO.
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.It ahsc%d: unexpected phase %d in icmd from %d
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The target described by
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.Sq from %d
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has taken the SCSI bus into a phase which is not
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expected during DMA IO setup.
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.El
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.Sh SEE ALSO
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.Xr scsibus 4
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.Sh HISTORY
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The
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.Nm
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interface first appeared in
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.Nx 1.0
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