adw(4)
NAME
adw - Advansys PCI 16bit SCSI Host adapter driver
SYNOPSIS
device pci device adw For one or more SCSI busses: device scbus
DESCRIPTION
- This driver provides access to the 16bit SCSI bus connected
- to the
Advanced Systems Products, Inc. ASC3550 Ultra, and - ASC38C0800 Ultra2,
SCSI Host Adapter chips. Both chips support, synchronous - transfers
(20MHz and 40MHz max respectively), 16bit transfers, tagged - queueing, and
up to 253 concurrent SCSI transactions. - Per target configuration performed in the AdvanceWare menu,
- which is
accessible at boot, is honored by this driver. This in - cludes synchronous/asynchronous transfers, maximum synchronous negoti
- ation rate,
wide transfers, disconnection, tagged queueing, and the host - adapter's
SCSI ID. The global setting for the maximum number of - tagged transactions allowed per target is not honored as the CAM SCSI sys
- tem will automatically determine the maximum number of tags a device can
- receive as
well as guarantee fair resource allocation among devices.
HARDWARE
The adw driver supports SCSI controllers including:
+o AdvanSys ABP940UW/ABP3940UW
+o AdvanSys ABP950UW
+o AdvanSys ABP970UW
+o AdvanSys ABP3940U2W
+o AdvanSys ABP3950U2W
SEE ALSO
adv(4), cd(4), da(4), sa(4), scsi(4)
HISTORY
The adw driver appeared in FreeBSD 3.0.
AUTHORS
- The adw driver was ported by Justin T. Gibbs from the Linux
- driver written by Bob Frey of Advanced System Products, Inc. Many
- thanks to AdvanSys for providing the original driver under a suitable li
- cense for use in
FreeBSD. - BSD July 14, 2004