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93 lines
2.7 KiB
Groff
93 lines
2.7 KiB
Groff
.\"
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.\" Copyright (c) 1994 Wilko Bulte
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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. 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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.\" $FreeBSD$
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.\"
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.Dd July 4, 2004
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.Dt AHB 4
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.Os
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.Sh NAME
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.Nm ahb
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.Nd Adaptec EISA SCSI host adapter driver
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.Sh SYNOPSIS
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To compile this driver into the kernel,
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place the following lines in your
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kernel configuration file:
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.Bd -ragged -offset indent
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.Cd "device scbus"
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.Cd "device ahb"
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.Ed
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.Pp
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Alternatively, to load the driver as a
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module at boot time, place the following line in
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.Xr loader.conf 5 :
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.Bd -literal -offset indent
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ahb_load="YES"
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.Ed
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.Sh DESCRIPTION
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This driver provides access to the
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.Tn SCSI
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bus connected to an Adaptec
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AHA-174X host adapters in
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.Dq Em enhanced
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mode.
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Tagged queueing and synchronous SCSI transfers are supported.
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.Sh HARDWARE
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The
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.Nm
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driver supports the following SCSI host adapters:
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.Pp
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.Bl -bullet -compact
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.It
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Adaptec AHA-1740
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.It
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Adaptec AHA-1742
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.It
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Adaptec AHA-1740A
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.It
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Adaptec AHA-1742A
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.El
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.Sh CAVEATS
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The Adaptec 174X is very sensitive to SCSI bus termination and cable
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length.
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It may also have difficulties operating with some modern devices
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that, due to their speed, expose timing problems in the controller.
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There are no known mechanisms for working around device incompatibilities of
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this nature.
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.Sh SEE ALSO
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.Xr aha 4 ,
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.Xr ahc 4 ,
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.Xr aic 4 ,
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.Xr cd 4 ,
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.Xr da 4 ,
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.Xr sa 4 ,
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.Xr scsi 4
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.Sh AUTHORS
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The
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.Nm
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driver was written by
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.An Justin T. Gibbs .
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