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:

DEPRECATION NOTICE¶

This driver is scheduled for removal prior to the release of FreeBSD 13.0.

DESCRIPTION¶

This driver provides access to the SCSI bus connected to a Buslogic/Mylex MultiMaster or compatible controller:

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-946C
• BusLogic BT-948
• BusLogic BT-956C
• BusLogic BT-956CD
• BusLogic BT-958
• BusLogic BT-958D
• Storage Dimensions SDC3211B / SDC3211F

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.