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+.\"
+.\" Copyright (c) 1997 David E. O'Brien
+.\"
+.\" 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. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``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 DEVELOPERS 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 July 16, 2005
+.Dt DE 4
+.Os
+.Sh NAME
+.Nm de
+.Nd "DEC DC21x4x Ethernet device driver"
+.Sh SYNOPSIS
+To compile this driver into the kernel,
+place the following line in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device de"
+.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
+if_de_load="YES"
+.Ed
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for the Ethernet adapters based on the Digital
+Equipment DC21x4x based self-contained Ethernet and Fast Ethernet
+chips.
+.Pp
+The
+.Nm
+driver supports the following media types:
+.Bl -tag -width xxxxxxxxxxxxxxx
+.It autoselect
+Enable autoselection of the media type and options
+.It 10baseT/UTP
+Set 10Mbps operation on the 10baseT port
+.It 10base2/BNC
+Set 10Mbps operation on the BNC port
+.It 10base5/AUI
+Set 10Mbps operation on the AUI port
+.It 100baseTX
+Set 100Mbps (Fast Ethernet) operation
+.It 100baseFX
+Set 100Mbps operation
+.It 100baseT4
+Set 100Mbps operation (4-pair cat-3 cable)
+.El
+.Pp
+The
+.Nm
+driver supports the following media options:
+.Bl -tag -width xxxxxxxxxxxxxxx
+.It full-duplex
+Set full duplex operation
+.El
+.Pp
+Note that the media types available depend on the particular card in use.
+Some cards are explicitly programmed to a particular media type by a
+setup utility and are not changeable.
+.Pp
+Use the
+.Xr ifconfig 8
+command and in particular the
+.Fl m
+flag to list the supported media types for your particular card.
+.Pp
+The old
+.Dq ifconfig linkN
+method of configuration is not supported.
+.Sh HARDWARE
+Adapters supported by the
+.Nm
+driver include:
+.Pp
+.Bl -bullet -compact
+.It
+Adaptec ANA-6944/TX
+.It
+Cogent EM100FX and EM440TX
+.It
+Corega FastEther PCI-TX
+.It
+D-Link DFE-500TX
+.It
+DEC DE435, DEC DE450, and DEC DE500
+.It
+ELECOM LD-PCI2T, LD-PCITS
+.It
+I-O DATA LA2/T-PCI
+.It
+SMC Etherpower 8432, 9332 and 9334
+.It
+ZNYX ZX3xx
+.El
+.Sh DIAGNOSTICS
+.Bl -diag
+.It "de%d: waking device from sleep/snooze mode"
+The 21041 and 21140A chips support suspending the operation of the card.
+.It "de%d: error: desired IRQ of %d does not match device's actual IRQ of %d"
+The device probe detected that the board is configured for a different
+interrupt than the one specified in the kernel configuration file.
+.It "de%d: not configured; limit of %d reached or exceeded"
+There is a limit of 32
+.Nm
+devices allowed in a single machine.
+.It "de%d: not configured; 21040 pass 2.0 required (%d.%d found)"
+.It "de%d: not configured; 21140 pass 1.1 required (%d.%d found)"
+Certain revisions of the chipset are not supported by this driver.
+.El
+.Sh SEE ALSO
+.Xr altq 4 ,
+.Xr arp 4 ,
+.Xr netintro 4 ,
+.Xr ng_ether 4 ,
+.Xr ifconfig 8
+.Sh AUTHORS
+.An -nosplit
+The
+.Nm
+device driver was written by
+.An Matt Thomas .
+This manual page was written by
+.An David E. O'Brien .