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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 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.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd August 18, 2020
-.Dt BT 4
-.Os
-.Sh NAME
-.Nm bt
-.Nd Buslogic/Mylex MultiMaster SCSI host adapter driver
-.Sh SYNOPSIS
-To compile this driver into the kernel,
-place the following lines in your
-kernel configuration file:
-.Bd -ragged -offset indent
-.Cd "device isa"
-.Cd "device scbus"
-.Cd "device bt"
-.Pp
-In
-.Pa /boot/device.hints :
-.Cd hint.bt.0.at="isa"
-.Cd hint.bt.0.port="0x330"
-.Ed
-.Sh DEPRECATION NOTICE
-This driver is scheduled for removal prior to the release of
-.Fx 13.0 .
-.Sh DESCRIPTION
-This driver provides access to the
-.Tn SCSI
-bus connected to a Buslogic/Mylex MultiMaster or compatible controller:
-.Bd -ragged -offset indent
-MultiMaster "W" Series Host Adapters:
-.Bl -column "BT-956CD " "ISA " "Commands " "Description"
-.Em "Adapter" Ta Em "Bus" Ta Em "Commands" Ta Em "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
-.Pp
-MultiMaster "C" Series Host Adapters:
-.Bl -column "BT-956CD " "ISA " "Commands " "Description"
-.Em "Adapter" Ta Em "Bus" Ta Em "Commands" Ta Em "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-545C	ISA	50	Fast SCSI-2
-BT-540CF	ISA	50	Fast SCSI-2
-.El
-.Pp
-MultiMaster "S" Series Host Adapters:
-.Bl -column "BT-956CD " "ISA " "Commands " "Description"
-.Em "Adapter" Ta Em "Bus" Ta Em "Commands" Ta Em "Description"
-BT-445S	VLB	30	Fast SCSI-2
-BT-545S	ISA	30	Fast SCSI-2
-BT-542D	ISA	30	Differential Fast SCSI-2
-BT-542B	ISA	30	SCSI-2 (542B revision H)
-.El
-.Pp
-MultiMaster "A" Series Host Adapters:
-.Bl -column "BT-956CD " "ISA " "Commands " "Description"
-.Em "Adapter" Ta Em "Bus" Ta Em "Commands" Ta Em "Description"
-BT-542B	ISA	30	SCSI-2 (542B revisions A - G)
-.El
-.Ed
-.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 HARDWARE
-The
-.Nm
-driver supports the following BusLogic MultiMaster
-.Dq W ,
-.Dq C ,
-.Dq S ,
-and
-.Dq A
-series and compatible SCSI host adapters:
-.Pp
-.Bl -bullet -compact
-.It
-BusLogic BT-445C
-.It
-BusLogic BT-445S
-.It
-BusLogic BT-540CF
-.It
-BusLogic BT-542B
-.It
-BusLogic BT-542B
-.It
-BusLogic BT-542D
-.It
-BusLogic BT-545C
-.It
-BusLogic BT-545S
-.It
-BusLogic/BusTek BT-640
-.It
-BusLogic BT-946C
-.It
-BusLogic BT-948
-.It
-BusLogic BT-956C
-.It
-BusLogic BT-956CD
-.It
-BusLogic BT-958
-.It
-BusLogic BT-958D
-.It
-Storage Dimensions SDC3211B / SDC3211F
-.El
-.Sh SEE ALSO
-.Xr cd 4 ,
-.Xr da 4 ,
-.Xr sa 4 ,
-.Xr scsi 4
-.Sh HISTORY
-The
-.Nm
-driver first appeared in the
-.Bx 386
-patch kit.
-.Sh AUTHORS
-.An -nosplit
-.An Julian Elischer
-wrote a driver for the Multimaster cards that appeared in the
-.Bx 386
-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.