NAME

     adw — Advansys PCI 16bit SCSI Host adapter driver

SYNOPSIS

     To compile this driver into the kernel, place the following lines in your kernel
     configuration file:

           device pci
           device scbus
           device adw

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 includes synchronous/asynchronous transfers, maximum
     synchronous negotiation 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 system 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:

     •   AdvanSys ABP940UW/ABP3940UW
     •   AdvanSys ABP950UW
     •   AdvanSys ABP970UW
     •   AdvanSys ABP3940U2W
     •   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 license for use in FreeBSD.