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ADW(4)                DragonFly Kernel Interfaces Manual                ADW(4)


NAME

     adw -- Advansys PCI 16bit SCSI Host adapter driver


SYNOPSIS

     device pci
     device adw

     For one or more SCSI busses:
     device scbus0 at adw0

     To allow PCI adapters to use memory mapped I/O if enabled:
     options ADW_ALLOW_MEMIO


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.  AdvanSys products incorporating these chips
     include the ABP[3]940UW, ABP950UW, ABP970UW, ABP3940U2W, and ABP3950U2W.
     Both chips support, synchronous transfers (20MHz and 40MHz max respec-
     tively), 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 synchro-
     nous/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 automati-
     cally determine the maximum number of tags a device can receive as well
     as guarantee fair resource allocation among devices.

     Memory mapped I/O can be enabled with the ``ADW_ALLOW_MEMIO'' configura-
     tion option.  Memory mapped I/O is more efficient than the alternative,
     programmed I/O.  Most PCI BIOSes will map devices so that either tech-
     nique for communicating with the card is available.


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 writ-
     ten by Bob Frey of Advanced System Products, Inc.  Many thanks to Advan-
     Sys for providing the original driver under a suitable license for use in
     FreeBSD.

DragonFly 3.5                 September 29, 2007                 DragonFly 3.5

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