BT(4) BSD Kernel Interfaces Manual BT(4)NAMEbt — Buslogic/Mylex MultiMaster SCSI host adapter driver
SYNOPSIS
device bt0 at isa? port ? irq ?
device scbus0 at bt0
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-545C ISA 50 Fast SCSI-2
BT-540CF ISA 50 Fast SCSI-2
MultiMaster "S" Series Host Adapters:
Adapter Bus Commands Description
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)
AMI FastDisk Host Adapters that are true BusLogic MultiMaster clones are
also supported by this driver.
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.
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
/sys/dev/disk/buslogic/bt_isa.c
ISA Bus Driver Attachment
SEE ALSOcd(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.
BSD October 16, 1998 BSD
