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if_xl(4)

NAME

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

SYNOPSIS

     device miibus
     device xl

DESCRIPTION

     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
			   modes.

     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
			   cards).

     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
     ifconfig(8).

     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.

DIAGNOSTICS

     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 won't 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
     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.

SEE ALSO

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

HISTORY

     The xl device driver first appeared in FreeBSD 3.0.

AUTHORS

     The xl driver was written by Bill Paul <wpaul@ctr.columbia.edu>.

FreeBSD 5.4			January 3, 2005 		   FreeBSD 5.4

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