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BT(4)		       FreeBSD Kernel Interfaces Manual			 BT(4)

NAME
     bt	-- Buslogic/Mylex MultiMaster SCSI host	adapter	driver

SYNOPSIS
     To	compile	this driver into the kernel, place the following lines in your
     kernel configuration file:

	   device isa
	   device scbus
	   device bt

	   In /boot/device.hints:
	   hint.bt.0.at="isa"
	   hint.bt.0.port="0x330"

DEPRECATION NOTICE
     This driver is scheduled for removal prior	to the release of
     FreeBSD 13.0.

DESCRIPTION
     This driver provides access to the	SCSI bus connected to a	Buslogic/Mylex
     MultiMaster or compatible controller:

	   MultiMaster "W" Series Host Adapters:

	   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

	   MultiMaster "C" Series Host Adapters:

	   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-545C	ISA	50	     Fast SCSI-2
	   BT-540CF	ISA	50	     Fast SCSI-2

	   MultiMaster "S" Series Host Adapters:

	   Adapter	Bus	Commands     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)

	   MultiMaster "A" Series Host Adapters:

	   Adapter	Bus	Commands     Description
	   BT-542B	ISA	30	     SCSI-2 (542B revisions A -	G)

     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.

     Boards with certain firmware revisions may	lock up	under heavy load to
     certain devices, especially if tagged queueing is used.  Should you en-
     counter a problem with your adapter, contact Mylex	technical support and
     ensure you	have the latest	firmware for your controller.

HARDWARE
     The bt driver supports the	following BusLogic MultiMaster "W", "C", "S",
     and "A" series and	compatible SCSI	host adapters:

     o	 BusLogic BT-445C
     o	 BusLogic BT-445S
     o	 BusLogic BT-540CF
     o	 BusLogic BT-542B
     o	 BusLogic BT-542B
     o	 BusLogic BT-542D
     o	 BusLogic BT-545C
     o	 BusLogic BT-545S
     o	 BusLogic/BusTek BT-640
     o	 BusLogic BT-946C
     o	 BusLogic BT-948
     o	 BusLogic BT-956C
     o	 BusLogic BT-956CD
     o	 BusLogic BT-958
     o	 BusLogic BT-958D
     o	 Storage Dimensions SDC3211B / SDC3211F

SEE ALSO
     cd(4), da(4), sa(4), scsi(4)

HISTORY
     The bt driver first appeared in the 386BSD	patch kit.

AUTHORS
     Julian Elischer wrote a driver for	the Multimaster	cards that appeared in
     the 386BSD	patch kit.  The	driver was rewritten by	Justin T. Gibbs	to
     take advantage of new board features and work with	the CAM	SCSI framework
     in	FreeBSD	3.0.

     Special thanks to 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 revi-
     sions, with their otherwise undocumented quirks, would not	have been pos-
     sible without his efforts.

FreeBSD	13.0			August 18, 2020			  FreeBSD 13.0
NAME | SYNOPSIS | DEPRECATION NOTICE | DESCRIPTION | HARDWARE | SEE ALSO | HISTORY | AUTHORS

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