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:

       •   BusLogic BT-445C
       •   BusLogic BT-445S
       •   BusLogic BT-540CF
       •   BusLogic BT-542B
       •   BusLogic BT-542B
       •   BusLogic BT-542D
       •   BusLogic BT-545C
       •   BusLogic BT-545S
       •   BusLogic/BusTek BT-640
       •   BusLogic BT-742A
       •   BusLogic BT-742A
       •   BusLogic BT-747C
       •   BusLogic BT-747D
       •   BusLogic BT-747S
       •   BusLogic BT-757C
       •   BusLogic BT-757CD
       •   BusLogic BT-757D
       •   BusLogic BT-757S
       •   BusLogic BT-946C
       •   BusLogic BT-948
       •   BusLogic BT-956C
       •   BusLogic BT-956CD
       •   BusLogic BT-958
       •   BusLogic BT-958D
       •   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.

Debian                                            June 18, 2006                                            BT(4)