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+.\" Copyright (c) 1997, 1998
+.\"	Bill Paul <wpaul@ctr.columbia.edu>. 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.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by Bill Paul.
+.\" 4. Neither the name of the author nor the names of any co-contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"   without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``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 Bill Paul OR THE VOICES IN HIS HEAD
+.\" 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.
+.\"
+.\"	$Id: tl.4,v 1.3 1998/05/06 05:40:56 wpaul Exp $
+.\"
+.Dd August 16, 1998
+.Dt XL 4 i386
+.Os FreeBSD
+.Sh NAME
+.Nm xl
+.Nd
+3Com Etherlink XL and Fast Etherlink XL ethernet device driver
+.Sh SYNOPSIS
+.Cd "device xl0"
+.Sh DESCRIPTION
+The
+.Nm
+driver provides support for PCI ethernet adapters and embedded
+controllers based on the 3Com "boomerang" and "cyclone" bus-master
+Etherlink XL chips. This includes the 3c900-TP, 3c900-COMBO, 3c905-TX,
+3c905-T4, 3c905B-TP, 3c905B-T4 and 3c905B-TX, and embedded 3c905-TX
+and 3c905B-TX ethernet hardware in certain Dell Optiplex and Dell
+Precision dexktop machines, and certain Dell Latitude laptop docking
+stations.
+.Pp
+The Etherlink XL chips support built-in 10baseT, 10base2 and 10base5
+transceivers as well as an MII bus for externally attached PHY
+transceivers. The 3c905 series typically uses a National Semiconductor
+NS 83840A 10/100 PHY for 10/100 Mbps support in full or half-duplex.
+The 3c905B adapters have built-in autonegotiation logic mapped onto
+the MII for compatibility with previous drivers. Fast Etherlink XL
+adapters such as the 3c905-TX and 3c905B-TX are capable of 10 or
+100Mbps data rates in either full or half duplex and can be manually
+configured for any supported mode or automatically negotiate the highest
+possible mode with a link partner.
+.Pp
+The
+.Nm
+driver supports the following media types:
+.Pp
+.Bl -tag -width xxxxxxxxxxxxxxxxxxxx
+.It autoselect
+Enable autoselection of the media type and options. Note that this
+option is only available with the 3c905 and 3c905B adapters with
+external PHYs or built-in autonegotiation logic. For 3c900 adapters,
+the driver will choose the mode specified in the EEPROM. The user can
+change this by adding media options to the
+.Pa /etc/rc.conf
+fine.
+.It 10baseT/UTP
+Set 10Mbps operation. The
+.Ar mediaopt
+option can abso be used to select either
+.Ar full-duplex
+or
+.Ar half-duplex modes.
+.It 100baseTX
+Set 100Mbps (fast ethernet) operation. The
+.Ar mediaopt
+option can abso be used to select either
+.Ar full-duplex
+or
+.Ar half-duplex modes.
+.It 10base5/AUI
+Enable AUI transceiver (available only on COMBO cards).
+.It 10base2/BNC
+Enable BNC coax transceiver (available only on COMBO cards).
+.El
+.Pp
+The
+.Nm
+driver supports the following media options:
+.Pp
+.Bl -tag -width xxxxxxxxxxxxxxxxxxxx
+.It full-duplex
+Force full duplex operation
+.It half-duplex
+Force half duplex operation.
+.El
+.Pp
+Note that the 100baseTX media type is only available if supported
+by the adapter.
+For more information on configuring this device, see
+.Xr ifconfig 8 .
+.Sh DIAGNOSTICS
+.Bl -diag
+.It "xl%d: couldn't map memory"
+A fatal initialization error has occurred.
+.It "xl%d: couldn't map interrupt"
+A fatal initialization error has occurred.
+.It "xl%d: device timeout"
+The device has stopped responding to the network, or there is a problem with
+the network connection (cable).
+.It "xl%d: no memory for rx list"
+The driver failed to allocate an mbuf for the receiver ring.
+.It "xl%d: no memory for tx list"
+The driver fauled to allocate an mbuf for the transmitter ring when
+allocating a pad buffer or collapsing an mbuf chain into a cluster.
+.It "xl%d: command never completed!"
+Some commands issued ot the 3c90x ASIC take time to complete: the
+driver is supposed to wait until the 'command in progress' bit in
+the status register clears before continuing. In rare instances, this
+bit may not clear. To avoid getting caught in an infinite wait loop,
+the driver only polls the bit for a finite number of times before
+giving up, at which point it issues this message. This message may
+be printed during driver initialization on slower machines. If you
+see this message but the driver continues to function normally, the
+message can probably be ignored.
+.It "xl%d: chip is in D3 power state -- setting to D0"
+This message applies only to 3c905B adapters, which support power
+management. Some operating systems place the 3c905B in low power
+mode when shutting down, and some PCI BIOSes fail to bring the chip
+out of this state before configuring it. The 3c905B loses all of
+its PCI configuration in the D3 state, so if the BIOS does not set
+it back to full power mode in time, it won't be able to configure it
+correctly. The driver tries to detect this condition and bring
+the adapter back to the D0 (full power) state, but this may not be
+enough to return the driver to a fully operational condition. If
+you see this message at boot time and the driver fails to attach
+the device as a network interface, you will have to perform second
+warm boot to have the device properly configured.
+.Pp
+Note that this condition only occurs when warm booting from another
+operating system. If you power down your system prior to booting
+.Fx ,
+the card should be configured correctly.
+.It "xl%d: WARNING: no media options bits set in the media options register!"
+This warning may appear when using the driver on some Dell Latitude
+docking stations with built-in 3c905-TX adapters. For whatever the
+reason, the 'MII available' bit in the media options register on
+this particular equipment is not set, even though it should be (the
+3c905-TX always uses an external PHY transceiver). The driver will
+attempt to guess the proper media type based on the PCI device ID
+word. The driver makes a lot of noise about this condition because
+the author considers it a manufacturing defect.
+.El
+.Sh SEE ALSO
+.Xr arp 4 ,
+.Xr netintro 4 , 
+.Xr ifconfig 8
+.Sh HISTORY
+The
+.Nm
+device driver first appeared in
+.Fx 3.0 .
+.Sh AUTHOR
+The
+.Nm
+driver was written by
+.An Bill Paul Aq wpaul@ctr.columbia.edu .