.\"
.\" Copyright (c) 1994 Jordan Hubbard
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.\" $FreeBSD$
.\"
.Dd February 15, 2017
.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 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.
