BT(4) MidnightBSD Kernel Interfaces Manual BT(4)

NAME

bt — Buslogic/Mylex MultiMaster SCSI host adapter driver

SYNOPSIS

device bt
device scbus

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.

FILES
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

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.

MidnightBSD 0.3 August 8, 2004 MidnightBSD 0.3