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.\"
.\" Copyright (c) 1994 Jordan Hubbard
.\" 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.
.\"
.\" $FreeBSD$
.\"
.Dd October 16, 1998
.Dt BT 4
.Os
.Sh NAME
.Nm bt
.Nd Buslogic/Mylex MultiMaster SCSI host adapter driver
.Sh SYNOPSIS
.Cd "device bt0 at isa? port ? irq ?"
.Cd device scbus0 at bt0
.Sh DESCRIPTION
This driver provides access to the
.Tn SCSI
bus connected to a Buslogic/Mylex MultiMaster or compatible controller:
.Pp
.Bd -ragged -offset indent
.Bl -column "BT-956CD " "ISA " "Commands " Description
MultiMaster "W" Series Host Adapters:
.Pp
.Em "Adapter Bus Commands Description"
BT-948 PCI 192 ULtra SCSI-3
BT-958 PCI 192 Wide ULtra SCSI-3
BT-958D PCI 192 Wide Differential ULtra SCSI-3
.El
.Bl -column "BT-956CD " "ISA " "Commands " Description
MultiMaster "C" Series Host Adapters:
.Pp
.Em "Adapter Bus Commands Description"
BT-946C PCI 100 Fast SCSI-2
BT-956C PCI 100 Wide Fast SCSI-2
BT-956CD PCI 100 Wide Differential Fast SCSI-2
BT-445C VLB 100 Fast SCSI-2
BT-747C EISA 100 Fast SCSI-2
BT-757C EISA 100 Wide Fast SCSI-2
BT-757CD EISA 100 Wide Differential Fast SCSI-2
BT-545C ISA 50 Fast SCSI-2
BT-540CF ISA 50 Fast SCSI-2
.El
.Bl -column "BT-956CD " "ISA " "Commands " Description
MultiMaster "S" Series Host Adapters:
.Pp
.Em "Adapter Bus Commands Description"
BT-445S VLB 30 Fast SCSI-2
BT-747S EISA 30 Fast SCSI-2
BT-747D EISA 30 Differential Fast SCSI-2
BT-757S EISA 30 Wide Fast SCSI-2
BT-757D EISA 30 Wide Differential Fast SCSI-2
BT-545S ISA 30 Fast SCSI-2
BT-542D ISA 30 Differential Fast SCSI-2
BT-742A EISA 30 SCSI-2 (742A revision H)
BT-542B ISA 30 SCSI-2 (542B revision H)
.El
.Bl -column "BT-956CD " "ISA " "Commands " Description
MultiMaster "A" Series Host Adapters:
.Pp
.Em "Adapter Bus Commands Description"
BT-742A EISA 30 SCSI-2 (742A revisions A - G)
BT-542B ISA 30 SCSI-2 (542B revisions A - G)
.El
.Ed
.Pp
AMI FastDisk Host Adapters that are true BusLogic MultiMaster clones are also
supported by this driver.
.Pp
Tagged queueing is supported on 'W' series adapters, 'C' series adapters
with firmware of rev 4.42 and higher, and 'S' series adapters with firmware
of rev 3.35 and higher.
.Pp
Boards with certain firmware revisions may lock up under heavy load to
certain devices, especially if tagged queueing is used. Should you encounter
a problem with your adapter, contact Mylex technical support and ensure you
have the latest firmware for your controller.
.Sh SEE ALSO
.Xr cd 4 ,
.Xr da 4 ,
.Xr sa 4 ,
.Xr scsi 4
.Sh AUTHORS
.An -nosplit
.An Julian Elischer
wrote a driver for the Multimaster cards that appeared in the 386BSD
patch kit. The driver was rewritten by
.An Justin T. Gibbs
to take advantage of new board features and work with the CAM SCSI framework in
.Fx 3.0 .
.Pp
Special thanks to
.An Leonard N. Zubkoff
for writing such a complete and well documented Mylex/BusLogic MultiMaster
driver for Linux. Support in this driver for the wide range of MultiMaster
controllers and firmware revisions, with their otherwise undocumented quirks,
would not have been possible without his efforts.
.Sh FILES
.Bl -tag -width /usr/share/man0/template.doc -compact
.It Pa sys/dev/buslogic/bt.c
Core Driver Implementation
.It Pa sys/dev/buslogic/btreg.h
MultiMaster Register Set and Core Driver Data Structures
.It Pa sys/pci/bt_pci.c
PCI Bus Driver Attachment
.It Pa sys/i386/eisa/bt_eisa.c
EISA Bus Driver Attachment
.It Pa sys/i386/isa/bt_isa.c
ISA/VL Bus Driver Attachment
.El
.Sh HISTORY
The
.Nm
driver first appeared in the 386BSD patch kit.
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