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XL(4)			 BSD Kernel Interfaces Manual			 XL(4)

     xl	-- 3Com	Etherlink XL and Fast Etherlink	XL Ethernet device driver

     To	compile	this driver into the kernel, place the following lines in your
     kernel configuration file:

	   device miibus
	   device xl

     Alternatively, to load the	driver as a module at boot time, place the
     following line in loader.conf(5):


     The xl driver provides support for	PCI Ethernet adapters and embedded
     controllers based on the 3Com "boomerang,"	"cyclone," "hurricane" and
     "tornado" bus-master Etherlink XL chips.

     The Etherlink XL chips support built-in 10baseT, 10base2 and 10base5
     transceivers as well as an	MII bus	for externally attached	PHY trans-
     ceivers.  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 sup-
     ported mode or automatically negotiate the	highest	possible mode with a
     link partner.

     The xl driver supports the	following media	types:

     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	/etc/rc.conf file.

     10baseT/UTP	   Set 10Mbps operation.  The mediaopt option can also
			   be used to select either full-duplex	or half-duplex

     100baseTX		   Set 100Mbps (Fast Ethernet) operation.  The
			   mediaopt option can also be used to select either
			   full-duplex or half-duplex modes.

     10base5/AUI	   Enable AUI transceiver (available only on COMBO

     10base2/BNC	   Enable BNC coax transceiver (available only on
			   COMBO cards).

     The xl driver supports the	following media	options:

     full-duplex	   Force full duplex operation

     half-duplex	   Force half duplex operation.

     Note that the 100baseTX media type	is only	available if supported by the
     adapter.  For more	information on configuring this	device,	see

     The xl driver supports the	following hardware:

     o	 3Com 3c900-TPO
     o	 3Com 3c900-COMBO
     o	 3Com 3c905-TX
     o	 3Com 3c905-T4
     o	 3Com 3c900B-TPO
     o	 3Com 3c900B-TPC
     o	 3Com 3c900B-FL
     o	 3Com 3c900B-COMBO
     o	 3Com 3c905B-T4
     o	 3Com 3c905B-TX
     o	 3Com 3c905B-FX
     o	 3Com 3c905B-COMBO
     o	 3Com 3c905C-TX
     o	 3Com 3c980, 3c980B, and 3c980C	server adapters
     o	 3Com 3cSOHO100-TX OfficeConnect adapters
     o	 3Com 3c450 HomeConnect	adapters
     o	 3Com 3c555, 3c556 and 3c556B mini-PCI adapters
     o	 3Com 3C3SH573BT, 3C575TX, 3CCFE575BT, 3CXFE575BT, 3CCFE575CT,
	 3CXFE575CT, 3CCFEM656,	3CCFEM656B, and	3CCFEM656C, 3CXFEM656,
	 3CXFEM656B, and 3CXFEM656C CardBus adapters
     o	 3Com 3c905-TX,	3c905B-TX 3c905C-TX, 3c920B-EMB, and 3c920B-EMB-WNM
	 embedded adapters

     Both the 3C656 family of CardBus cards and	the 3C556 family of MiniPCI
     cards have	a built-in proprietary modem.  Neither the xl driver nor any
     other FreeBSD driver supports this	modem.

     xl%d: couldn't map	memory	A fatal	initialization error has occurred.

     xl%d: couldn't map	interrupt  A fatal initialization error	has occurred.

     xl%d: device timeout  The device has stopped responding to	the network,
     or	there is a problem with	the network connection (cable).

     xl%d: no memory for rx list  The driver failed to allocate	an mbuf	for
     the receiver ring.

     xl%d: no memory for tx list  The driver failed to allocate	an mbuf	for
     the transmitter ring when allocating a pad	buffer or collapsing an	mbuf
     chain into	a cluster.

     xl%d: command never completed!  Some commands issued to 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 mes-
     sage 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.

     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 will not be
     able to configure it correctly.  The driver tries to detect this condi-
     tion 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.

     Note that this condition only occurs when warm booting from another oper-
     ating system.  If you power down your system prior	to booting FreeBSD,
     the card should be	configured correctly.

     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 dock-
     ing 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 manu-
     facturing defect.

     altq(4), arp(4), cardbus(4), miibus(4), netintro(4), ng_ether(4),
     pccard(4),	polling(4), ifconfig(8)

     The xl device driver first	appeared in FreeBSD 3.0.

     The xl driver was written by Bill Paul <>.

BSD				 July 16, 2005				   BSD


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