BT(4)							   BSD 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"

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-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

	   MultiMaster "S" Series Host Adapters:

	   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)

	   MultiMaster "A" Series Host Adapters:

	   Adapter	Bus	Commands     Description
	   BT-742A	EISA	30	     SCSI-2 (742A revisions A - G)
	   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
     encounter 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-742A
     o	 BusLogic BT-742A
     o	 BusLogic BT-747C
     o	 BusLogic BT-747D
     o	 BusLogic BT-747S
     o	 BusLogic BT-757C
     o	 BusLogic BT-757CD
     o	 BusLogic BT-757D
     o	 BusLogic BT-757S
     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

     AMI FastDisk Host Adapters that are true BusLogic MultiMaster clones are also supported by the bt driver.

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 revisions, with their otherwise undocumented quirks, would not have
     been possible without his efforts.

BSD
								   June 18, 2006							       BSD