66 lines
2.3 KiB
Groff
66 lines
2.3 KiB
Groff
.\"
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.\" Copyright (c) 1994 James A. Jegers
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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. 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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.Dd November 29, 1994
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.Dt AHA 4 i386
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.Os NetBSD
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.Sh NAME
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.Nm aha
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.Nd Adaptec 154x SCSI adapter driver
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.Sh SYNOPSIS
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.Cd "aha0 at isa? port 0x330 irq ? drq ?"
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.Cd "scsibus* at aha?"
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.Sh DESCRIPTION
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The
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.Nm aha
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driver provides support for the following SCSI adapters:
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.Pp
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.Bl -tag -width -offset indent -compact
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.It Adaptec AHA-154xA
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.It Adaptec AHA-154xB
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.It Adaptec AHA-154xC
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.It Adaptec AHA-154xCF
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.It Buslogic BT-54x
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.El
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.Sh BUGS
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The
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.Nm
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driver can not be used on systems with more than 16 megabytes of
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memory.
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.Pp
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Due to the 24 bit addressing limitation of the ISA bus, The SCSI
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adapter's onboard DMA controller is unable to access memory with
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addresses greater than 16 megabytes.
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.Pp
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This restriction can be fixed with "bounce buffers", buffers in low
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memory which are used whenever data to be transfered to or from the
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SCSI adapter is above the 16 megabyte threshold. The data is copied
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to the bounce buffer, then copied from the bounce buffer to its
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destination.
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.Sh SEE ALSO
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.Xr intro 4 ,
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.Xr sd 4 ,
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.Xr st 4 ,
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.Xr cd 4 ,
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.Xr ch 4
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