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BT(4)			 BSD Kernel Interfaces Manual			 BT(4)

     bt	-- Buslogic/Mylex MultiMaster SCSI host	adapter	driver

     device bt
     device scbus

     In	/boot/device.hints:"isa""0x330"

     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 en-
     counter a problem with your adapter, contact Mylex	technical support and
     ensure you	have the latest	firmware for your controller.

     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.

     sys/dev/buslogic/bt.c	   Core	Driver Implementation
     sys/dev/buslogic/btreg.h	   MultiMaster Register	Set and	Core Driver
				   Data	Structures
     sys/pci/bt_pci.c		   PCI Bus Driver Attachment
     sys/i386/eisa/bt_eisa.c	   EISA	Bus Driver Attachment
     sys/i386/isa/bt_isa.c	   ISA/VL Bus Driver Attachment

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

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

     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.

BSD				August 8, 2004				   BSD


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