66 lines
2.3 KiB
Groff
66 lines
2.3 KiB
Groff
|
.\"
|
||
|
|
.\" Copyright (c) 1994 James A. Jegers
|
||
|
|
.\" All rights reserved.
|
||
|
|
.\"
|
||
|
|
.\" Redistribution and use in source and binary forms, with or without
|
||
|
|
.\" modification, are permitted provided that the following conditions
|
||
|
|
.\" are met:
|
||
|
|
.\" 1. Redistributions of source code must retain the above copyright
|
||
|
|
.\" notice, this list of conditions and the following disclaimer.
|
||
|
|
.\" 2. The name of the author may not be used to endorse or promote products
|
||
|
|
.\" derived from this software without specific prior written permission
|
||
|
|
.\"
|
||
|
|
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
||
|
|
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
||
|
|
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
||
|
|
.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||
|
|
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
||
|
|
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
||
|
|
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
||
|
|
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||
|
|
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
||
|
|
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
.\"
|
||
|
|
.Dd November 29, 1994
|
||
|
|
.Dt AHA 4 i386
|
||
|
|
.Os NetBSD
|
||
|
|
.Sh NAME
|
||
|
|
.Nm aha
|
||
|
|
.Nd Adaptec 154x SCSI adapter driver
|
||
|
|
.Sh SYNOPSIS
|
||
|
|
.Cd "aha0 at isa? port 0x330 irq ? drq ?"
|
||
|
|
.Cd "scsibus* at aha?"
|
||
|
|
.Sh DESCRIPTION
|
||
|
|
The
|
||
|
|
.Nm aha
|
||
|
|
driver provides support for the following SCSI adapters:
|
||
|
|
.Pp
|
||
|
|
.Bl -tag -width -offset indent -compact
|
||
|
|
.It Adaptec AHA-154xA
|
||
|
|
.It Adaptec AHA-154xB
|
||
|
|
.It Adaptec AHA-154xC
|
||
|
|
.It Adaptec AHA-154xCF
|
||
|
|
.It Buslogic BT-54x
|
||
|
|
.El
|
||
|
|
.Sh BUGS
|
||
|
|
The
|
||
|
|
.Nm
|
||
|
|
driver can not be used on systems with more than 16 megabytes of
|
||
|
|
memory.
|
||
|
|
.Pp
|
||
|
|
Due to the 24 bit addressing limitation of the ISA bus, The SCSI
|
||
|
|
adapter's onboard DMA controller is unable to access memory with
|
||
|
|
addresses greater than 16 megabytes.
|
||
|
|
.Pp
|
||
|
|
This restriction can be fixed with "bounce buffers", buffers in low
|
||
|
|
memory which are used whenever data to be transfered to or from the
|
||
|
|
SCSI adapter is above the 16 megabyte threshold. The data is copied
|
||
|
|
to the bounce buffer, then copied from the bounce buffer to its
|
||
|
|
destination.
|
||
|
|
.Sh SEE ALSO
|
||
|
|
.Xr intro 4 ,
|
||
|
|
.Xr sd 4 ,
|
||
|
|
.Xr st 4 ,
|
||
|
|
.Xr cd 4 ,
|
||
|
|
.Xr ch 4
|