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+.\"	$NetBSD: dpt.4,v 1.24 2009/04/10 15:21:09 joerg Exp $
+.\"
+.\" Copyright (c) 1999, 2000, 2002 Andrew Doran <ad@NetBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. The name of the author may not be used to endorse or promote products
+.\"    derived from this software without specific prior written permission
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd December 7, 2002
+.Dt DPT 4
+.Os
+.Sh NAME
+.Nm dpt
+.Nd
+DPT EATA
+.Tn SCSI
+adapter driver
+.Sh SYNOPSIS
+.Cd "dpt* at isa? port ? irq ? dma ?"
+.Cd "dpt* at eisa? slot ?"
+.Cd "dpt* at pci? dev ? function ?"
+.Cd "scsibus* at dpt?"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for third and fourth generation DPT
+.Tn SCSI
+controllers.  All communication with the controllers is conducted via the
+EATA (Enhanced AT Bus Attachment) protocol.
+.Pp
+DPT adapters examine and interpret all
+.Tn 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.
+.Sh HARDWARE
+The
+.Nm
+driver provides support for the adapters listed below.  Later models are
+supported by the
+.Nm iop
+driver.
+.Pp
+.Bl -tag -width Dv -offset indent -compact
+.It Tn DPT SmartCache III
+.It Tn DPT SmartCache IV
+.It Tn DPT SmartRAID III
+.It Tn DPT SmartRAID IV
+.El
+.Sh FILES
+.Bl -tag -width /dev/dptn -compact
+.It Pa /dev/dpt Ns Ar u
+control device for unit
+.Ar u
+.El
+.Sh DIAGNOSTICS
+None of these messages should be encountered under normal circumstances.  It
+should be noted that the list below is not complete.
+.Pp
+.Bl -tag -width indent
+.It 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.
+.It dpt%d: spurious intr
+A spurious interrupt was received from the HBA.
+.It dpt%d: bogus status (returned CCB id NNNN)
+A corrupt or incomplete status packet was received from the HBA.
+.El
+.Sh SEE ALSO
+.Xr cd 4 ,
+.Xr ch 4 ,
+.Xr dpti 4 ,
+.Xr intro 4 ,
+.Xr iop 4 ,
+.Xr scsi 4 ,
+.Xr sd 4 ,
+.Xr st 4
+.Pp
+The
+.Pa sysutils/dptutil
+package.
+.Pp
+CAM committee standard CAM/89-004 - the EATA (Enhanced AT Bus Attachment)
+protocol.
+.Sh HISTORY
+The
+.Nm dpt
+driver first appeared in
+.Nx 1.4.2 .
+.Sh BUGS
+EATA adapters other than listed may function correctly with the
+.Nm
+driver, however a definitive list is not available.
+.Pp
+Older boards that do not support scatter-gather I/O or DMA are not supported.
+.Pp
+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.