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:| 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-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-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) |
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
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.