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     adw — Advansys PCI 16bit SCSI Host adapter driver


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

           device pci
           device scbus
           device adw


     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.


     The adw driver supports SCSI controllers including:

     ·   AdvanSys ABP940UW/ABP3940UW
     ·   AdvanSys ABP950UW
     ·   AdvanSys ABP970UW
     ·   AdvanSys ABP3940U2W
     ·   AdvanSys ABP3950U2W


     adv(4), cd(4), da(4), sa(4), scsi(4)


     The adw driver appeared in FreeBSD 3.0.


     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.