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+.\"
+.\" Copyright (c) 1998 Justin T. Gibbs
+.\" 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.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 18, 2006
+.Dt DPT 4
+.Os
+.Sh NAME
+.Nm dpt
+.Nd DPT RAID Controller SCSI driver
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following lines in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device scbus"
+.Cd "device dpt"
+.Pp
+For one or more EISA cards:
+.Cd "device eisa"
+.Pp
+For one or more ISA cards:
+.Cd "device isa"
+.Pp
+For one or more PCI cards:
+.Cd "device pci"
+.Pp
+To allow PCI adapters to use memory mapped I/O if enabled:
+.Cd options DPT_ALLOW_MEMIO
+.Ed
+.Pp
+Alternatively, to load the driver as a
+module at boot time, place the following line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+dpt_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+driver supports DPT RAID SCSI controllers.
+.Pp
+SmartRAID (PM3???) are "Enterprise" class cards,
+and SmartCache (PM2???) cards are in the "Workstation" class.
+The Gen 4 Smart Cache IV products were a re-issue of the Gen 3 utilizing
+upgraded (and cheaper to produce) silicon.
+The PM3334 (Smart RAID III) was not revamped as there was no upgraded silicon
+(68040 processor) and it was using the best DPT made.
+Note there has been customer confusion over the faster enterprise class card
+supported by this driver being an older generation.
+The Gen5 cards are supported by the
+.Xr asr 4
+driver.
+.Sh HARDWARE
+The
+.Nm
+driver provides support for the following RAID adapters:
+.Pp
+.Bl -bullet -compact
+.It
+DPT Smart Cache Plus
+.It
+Smart Cache II (PM2?2?, PM2022 [EISA], PM2024/PM2124 [PCI]) (Gen2)
+.It
+Smart RAID II (PM3?2?, PM3021, PM3222)
+.It
+Smart Cache III (PM2?3?)
+.It
+Smart RAID III (PM3?3?, PM3332 [EISA], PM3334UW [PCI]) (Gen3)
+.It
+Smart Cache IV (PM2?4?, PM2042 [EISA], PM2044/PM2144 [PCI]) (Gen4)
+.It
+Smart RAID IV
+.El
+.Sh SEE ALSO
+.Xr asr 4 ,
+.Xr cd 4 ,
+.Xr ch 4 ,
+.Xr da 4 ,
+.Xr sa 4 ,
+.Xr scsi 4
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Fx 2.2.6 .
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+driver was written by
+.An Simon Shapiro
+and ported to the CAM SCSI system by
+.An Justin T. Gibbs .