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BT(4)                 DragonFly 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 scbus
           device bt


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

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

     Tagged queueing is supported on 'W' series adapters and 'C' series
     adapters with firmware of rev 4.42 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.


FILES

     /sys/dev/disk/buslogic/bt.c   Core Driver Implementation
     /sys/dev/disk/buslogic/btreg.h
                                   MultiMaster Register Set and Core Driver
                                   Data Structures
     /sys/dev/disk/buslogic/bt_pci.c
                                   PCI Bus Driver Attachment


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.

DragonFly 3.5                  November 29, 2012                 DragonFly 3.5

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