1.\" 2.\" Copyright (c) 1994 Jordan Hubbard 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 3. The name of the author may not be used to endorse or promote products 14.\" derived from this software without specific prior written permission 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26.\" 27.\" $FreeBSD: src/share/man/man4/bt.4,v 1.10.4.6 2001/10/01 13:07:23 dd Exp $ 28.\" 29.Dd November 29, 2012 30.Dt BT 4 31.Os 32.Sh NAME 33.Nm bt 34.Nd Buslogic/Mylex MultiMaster SCSI host adapter driver 35.Sh SYNOPSIS 36.Cd device scbus 37.Cd device bt 38.Sh DESCRIPTION 39This driver provides access to the 40.Tn SCSI 41bus connected to a Buslogic/Mylex MultiMaster or compatible controller: 42.Bd -ragged -offset indent 43.Bl -column "BT-956CD " "PCI " "Commands " Description 44MultiMaster "W" Series Host Adapters: 45.Pp 46.Em "Adapter Bus Commands Description" 47BT-948 PCI 192 ULtra SCSI-3 48BT-958 PCI 192 Wide ULtra SCSI-3 49BT-958D PCI 192 Wide Differential ULtra SCSI-3 50.El 51.Bl -column "BT-956CD " "PCI " "Commands " Description 52MultiMaster "C" Series Host Adapters: 53.Pp 54.Em "Adapter Bus Commands Description" 55BT-946C PCI 100 Fast SCSI-2 56BT-956C PCI 100 Wide Fast SCSI-2 57BT-956CD PCI 100 Wide Differential Fast SCSI-2 58.El 59.Ed 60.Pp 61AMI FastDisk Host Adapters that are true BusLogic MultiMaster clones are also 62supported by this driver. 63.Pp 64Tagged queueing is supported on 'W' series adapters and 'C' series adapters 65with firmware of rev 4.42 and higher. 66.Pp 67Boards with certain firmware revisions may lock up under heavy load to 68certain devices, especially if tagged queueing is used. Should you encounter 69a problem with your adapter, contact Mylex technical support and ensure you 70have the latest firmware for your controller. 71.Sh FILES 72.Bl -tag -width /usr/share/man0/template.doc -compact 73.It Pa /sys/dev/disk/buslogic/bt.c 74Core Driver Implementation 75.It Pa /sys/dev/disk/buslogic/btreg.h 76MultiMaster Register Set and Core Driver Data Structures 77.It Pa /sys/dev/disk/buslogic/bt_pci.c 78PCI Bus Driver Attachment 79.El 80.Sh SEE ALSO 81.Xr cd 4 , 82.Xr da 4 , 83.Xr sa 4 , 84.Xr scsi 4 85.Sh HISTORY 86The 87.Nm 88driver first appeared in the 89.Bx 386 90patch kit. 91.Sh AUTHORS 92.An -nosplit 93.An Julian Elischer 94wrote a driver for the Multimaster cards that appeared in the 95.Bx 386 96patch kit. The driver was rewritten by 97.An Justin T. Gibbs 98to take advantage of new board features and work with the CAM SCSI framework in 99.Fx 3.0 . 100.Pp 101Special thanks to 102.An Leonard N. Zubkoff 103for writing such a complete and well documented Mylex/BusLogic MultiMaster 104driver for Linux. Support in this driver for the wide range of MultiMaster 105controllers and firmware revisions, with their otherwise undocumented quirks, 106would not have been possible without his efforts. 107