106 lines
3.9 KiB
Groff
106 lines
3.9 KiB
Groff
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.\"
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.\" Copyright (c) 1995
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.\" Justin T. Gibbs. 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 withough 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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.\"
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.Dd April 15, 1995
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.Dt AHC 4 i386
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.Os FreeBSD
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.Sh NAME
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.Nm ahc
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.Nd
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Adaptec VL/EISA/PCI SCSI host adapter driver
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.Sh SYNOPSIS
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For VL/EISA cards:
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.Cd "controller ahc0 at isa? bio irq ? vector ahcintr
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.sp
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For PCI cards:
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.Cd "controller ahc0
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.sp
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For one or more SCSI busses:
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.Cd "controller scbus0
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.sp
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For one or more disk devices:
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.Cd "device sd0
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.sp
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For one or more tape devices:
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.Cd "device st0
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.sp
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For one or more cdroms:
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.Cd "device cd0
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.Sh DESCRIPTION
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This driver provides access to SCSI devices connected to an Adaptec
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274x, 284x, 294x, or motherboard based aic7770/aic7870 hostadapter.
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Features include twin and wide bus support, 2 commands per target in
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non-tagged queuing mode, and experimental tagged queuing support enabled
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with:
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.sp
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.Cd "option AHC_TAGENABLE
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.sp
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Per target configuration performed in the SCSI-Select menu, accesible at boot
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in non-EISA models or throught an EISA configuration utility for EISA models,
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is honored by this driver with the stipulation that the BIOS is enabled for
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EISA adaptors. This includes syncronous/asyncronous transfers, disconnection,
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and maximum syncronous negotiation rate settings.
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.sp
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Note that I/O addresses are determined automatically by the probe routines,
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but care should be taken when using a 284x (VLB controller) in an EISA
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system. Ensure that the jumpers setting the I/O area for the 284x match the
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EISA slot into which the card is inserted to prevent conflicts with other
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EISA cards.
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.Sh BUGS
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Some Quantum drives (at least the Empire 2100 and 1080s) will not run on an
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aic7870 in syncronous mode at 10MB/s. It is speculated that the Adaptec
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runs slightly above 10MB/s causing the drive much confusion. Setting a
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maximum syncronous negotiation rate of 8MB/s in the SCSI-Select utility
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will allow normal function.
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.sp
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The SCSI ID of aic7870 based controllers (AHA-294x) is hard coded to 7 by
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the driver. The user configured ID can be obtained by querying the SEEPROM
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or NVRAM where these settings are stored, but there is no driver support for
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this as of yet.
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.Sh FILES
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.Bl -tag -width Pa -compact
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.It Pa /sys/i386/scsi/aic7xxx.c
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.It Pa /sys/i386/scsi/aic7xxx.h
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Bus independent driver source
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.It Pa /sys/i386/eisa/aic7770.c
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EISA device probe/attach routines
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.It Pa /sys/pci/aic7870.c
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PCI device probe/attach routines
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.It Pa /sys/dev/aic7xxx/aic7xxx.seq
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aic7xxx sequencer program
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.It Pa /sys/i386/conf/GENERIC
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sample generic kernel config file including Adaptec support
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.El
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.Sh SEE ALSO
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.Xr aha 4
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.Xr ahb 4
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.Xr aic7xxx_asm 1
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.Xr cd 4
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.Xr scsi 4
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.Xr sd 4
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.Xr st 4
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