mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-26 11:47:31 +00:00
128 lines
3.7 KiB
Groff
128 lines
3.7 KiB
Groff
.\"
|
|
.\" Copyright (c) 1995
|
|
.\" Justin T. Gibbs. 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. Redistributions in binary form must reproduce the above copyright
|
|
.\" notice, this list of conditions and the following disclaimer in the
|
|
.\" documentation and/or other materials provided with the distribution.
|
|
.\" 3. The name of the author may not be used to endorse or promote products
|
|
.\" derived from this software withough 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 April 15, 1995
|
|
.Dt AHC 4 i386
|
|
.Os FreeBSD
|
|
.Sh NAME
|
|
.Nm ahc
|
|
.Nd Adaptec VL/EISA/PCI SCSI host adapter driver
|
|
.Sh SYNOPSIS
|
|
For VL/EISA cards:
|
|
.Cd controller ahc0 at isa? bio irq ? vector ahcintr
|
|
.Pp
|
|
For PCI cards:
|
|
.Cd controller ahc0
|
|
.Pp
|
|
To enable tagged queueing:
|
|
.Cd options AHC_TAGENABLE
|
|
.Pp
|
|
For one or more SCSI busses:
|
|
.Cd controller scbus0 at ahc0
|
|
.Sh DESCRIPTION
|
|
This driver provides access to the
|
|
.Tn SCSI
|
|
bus connected to an Adaptec
|
|
274x, 284x, 294x, or motherboard-based
|
|
.Tn AIC7770
|
|
or
|
|
.Tn AIC7870
|
|
host adapter.
|
|
Features include twin and wide bus support, two commands per target in
|
|
non-tagged-queuing mode, and experimental tagged queuing support enabled
|
|
with the
|
|
.Dq Dv AHC_TAGENABLE
|
|
configuration option.
|
|
.Pp
|
|
Per target configuration performed in the
|
|
.Tn SCSI-Select
|
|
menu, accesible at boot
|
|
in
|
|
.No non- Ns Tn EISA
|
|
models or through an
|
|
.Tn EISA
|
|
configuration utility for
|
|
.Tn EISA
|
|
models,
|
|
is honored by this driver with the stipulation that the
|
|
.Tn BIOS
|
|
must be enabled for
|
|
.Tn EISA
|
|
adaptors. This includes synchronous/asynchronous transfers, disconnection,
|
|
and maximum synchronous negotiation rate settings.
|
|
.Pp
|
|
Note that I/O addresses are determined automatically by the probe routines,
|
|
but care should be taken when using a 284x
|
|
.Pq Tn VESA No local bus controller
|
|
in an
|
|
.Tn EISA
|
|
system. Ensure that the jumpers setting the I/O area for the 284x match the
|
|
.Tn EISA
|
|
slot into which the card is inserted to prevent conflicts with other
|
|
.Tn EISA
|
|
cards.
|
|
.Sh BUGS
|
|
Some Quantum drives (at least the Empire 2100 and 1080s) will not run on an
|
|
.Tn AIC7870
|
|
in synchronous mode at 10MB/s. It is speculated that the Adaptec
|
|
runs slightly above 10MB/s, causing the drive much confusion. Setting a
|
|
maximum synchronous negotiation rate of 8MB/s in the
|
|
.Tn SCSI-Select
|
|
utility
|
|
will allow normal function.
|
|
.Pp
|
|
The
|
|
.Tn SCSI
|
|
ID of
|
|
.No Tn AIC7870 Ns -based
|
|
controllers
|
|
.Pq Tn AHA-294x
|
|
is hard coded to 7 by the driver. The user configured ID can be
|
|
obtained by querying the adapter, but there is no driver support for
|
|
this as of yet.
|
|
.Sh SEE ALSO
|
|
.Xr aha 4 ,
|
|
.Xr ahb 4 ,
|
|
.Xr cd 4 ,
|
|
.Xr scsi 4 ,
|
|
.Xr sd 4 ,
|
|
.Xr st 4
|
|
.Sh AUTHOR
|
|
The
|
|
.Nm
|
|
driver was written by Justin Gibbs. The
|
|
.Tn AIC7xxx
|
|
sequencer-code assembler was
|
|
written by John Aycock.
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
driver appeared in
|
|
.Tn FreeBSD
|
|
2.1.
|
|
|