bt —
Buslogic/Mylex MultiMaster SCSI host adapter
driver
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"
This driver is scheduled for removal prior to the release of
FreeBSD 13.0.
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-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.
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
cd(4),
da(4),
sa(4),
scsi(4)
The
bt driver first appeared in the
386BSD patch kit.
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.