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NAME
     cpqncr - low-level module for Compaq 32-Bit Fast-Wide SCSI-2
     EISA/PCI  (825)  and  Compaq  Wide-Ultra SCSI PCI (875) Con-
     trollers

DESCRIPTION
     The cpqncr  module  provides  low-level  interface  routines
     between  the  common  disk/tape I/O subsystem and the Compaq
     825/875 SCSI (Small Computer System Interface) controllers.

     The cpqncr module can be configured for disk  and  streaming
     tape  support  for  one  or more Compaq 825/875 controllers.
     Each controller should be the sole initiator on a SCSI  bus.
     Auto configuration code determines if the adapter is present
     at the configured address and  what  types  of  devices  are
     attached to it.

CONFIGURATION
     The driver attempts to initialize itself in accordance  with
     the   information   found   in   the   configuration   file,
     cpqncr.conf. The relevant user configurable  items  in  this
     file are as follows:

     debug_flag
           This property enables or disables  driver  debug  mes-
           sages.  These  messages  are not displayed by default.
           Setting the value to 1 enables debug messages; setting
           it to 0 disables it.

     alarm_msg_enable
           This property enables  alarm  messages  displayed  for
           Storage  System  faults. Alarm messages are enabled by
           setting the value to 1 and disabled by setting  it  to
           0. These messages are disabled by default.

     tag_enable
           This property enables or disables tag queueing support
           by the driver. Tagged Queueing is disabled by default.
           Tagged queueing is enabled by setting the value  to  1
           and disabled by setting the value to 0.

     queue_depth
           This property sets the number of active  requests  the
           driver  can  handle  for a controller. The maximum and
           default value is 37 and the minimum value is 13.  This
           can be decreased for supporting multiple controllers.

     board_id
           This property enables support  for  Compaq  SCSI  con-
           trollers  other  than  Compaq 825/875 controllers. The
           board ID (Vendor and Device ID) must be specified  for
           the driver to support the controller.

FILES
     /kernel/drv/cpqncr.conf
           configuration file for the  cpqncr driver

ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:

     ____________________________________________________________
    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    |_____________________________|_____________________________|
    | Architecture                | IA                          |
    |_____________________________|_____________________________|


SEE ALSO
     driver.conf(4), attributes(5)

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