dpt(4) - NetBSD Manual Pages

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DPT(4)                    NetBSD Programmer's Manual                    DPT(4)


NAME

     dpt - DPT EATA SCSI adapter driver


SYNOPSIS

     dpt* at isa? port ? irq ? dma ?
     dpt* at eisa? slot ?
     dpt* at pci? dev ? function ?
     scsibus* at dpt?


DESCRIPTION

     The dpt driver provides support for third and fourth generation DPT SCSI
     controllers.  All communication with the controllers is conducted via the
     EATA (Enhanced AT Bus Attachment) protocol (CAM committee standard
     CAM/89-004).

     DPT adapters examine and interpret all SCSI commands received before
     passing them to any underlying physical device(s).  In this way, caching,
     RAID and other transformations are achieved while remaining transparent
     to the host operating system.


HARDWARE

     The dpt driver provides support for the following SCSI adapters:

           DPT SmartCache III
           DPT SmartCache IV
           DPT SmartRAID III
           DPT SmartRAID IV


DIAGNOSTICS

     None of these messages should be encountered under normal circumstances.
     It should be noted that the list below is not complete.

     dpt%d: readcfg failed - see dpt(4)
             The EATA configuration data did not appear upon request.  This
             may be caused by older firmware.  Generally the solution is to
             power-cycle the affected machine.

     dpt%d: spurious intr
             A spurious interrupt was recieved from the HBA.

     dpt%d: bogus status (returned CCB id NNNN)
             A corrupt or incomplete status packet was recieved from the HBA.


SEE ALSO

     intro(4), cd(4), ch(4), scsi(4).  sd(4), st(4)


AUTHOR

     The dpt driver was written by Andy Doran <ad@netbsd.org>, based upon the
     uha and bha drivers, which are the work of others.


HISTORY

     The dpt driver first appeared in NetBSD 1.4.2.


BUGS

     EATA adapters other than listed may function correctly with the dpt driv-
     er, however a definitive list is not avaiable.

     Older firmware may prove problematic.  It is recommended that the latest
     available firmware be used.  Contact DPT for a firmware update.

     Older boards that do not suppport scatter-gather I/O or DMA are not sup-
     ported.

     The number of queued commands available on ISA devices is clamped.

     The current SCSI subsystem can not take full advantage of the capabili-
     ties provided by DPT adapters.

     ECC formatted disk and arrays (i.e. with a sector size of 528 bytes) do
     not work correctly with the PM2041 and certain firmware revisions of the
     PM3334.

NetBSD 1.5.1                  September 28, 1999                             2