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LE(4)		       FreeBSD Kernel Interfaces Manual			 LE(4)

     le	-- AMD Am7900 LANCE and	Am79C9xx ILACC/PCnet Ethernet interface	driver

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

	   device le

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


     For ISA non-PnP adapters, the port	address	as well	as the IRQ and the DRQ
     numbers have to be	specified in /boot/device.hints:"isa"

     The le driver provides support for	Ethernet adapters based	on the AMD
     Am7990 and	Am79C90	(CMOS, pin-compatible) Local Area Network Controller
     for Ethernet (LANCE) chips.

     The le driver also	supports Ethernet adapters based on the	AMD Am79C900
     Integrated	Local Area Communications Controller (ILACC) as	well as	the
     Am79C9xx PCnet family of chips, which are single-chip implementations of
     a LANCE chip and a	DMA engine.  The le driver treats all of these PCI bus
     Ethernet chips as an AMD Am79C970 PCnet-PCI and does not support the ad-
     ditional features like the	MII bus	and burst mode of AMD Am79C971
     PCnet-FAST	and greater chips.

     Generally,	the le driver aims at supporting as many different chips on as
     many different platforms as possible, partially at	the cost of the	best
     performance with some of these.

     The le driver supports reception and transmission of extended frames for
     vlan(4).  Selective reception of multicast	Ethernet frames	is provided by
     a 64-bit mask; multicast destination addresses are	hashed to a bit	entry
     using the Ethernet	CRC function.

     The le driver supports ISA	bus Ethernet adapters which are	based on the
     following chips:

     +o	 AMD Am7990 and	Am79C90	LANCE
     +o	 AMD Am79C960 PCnet-ISA
     +o	 AMD Am79C961 PCnet-ISA+
     +o	 AMD Am79C961A PCnet-ISA II

     This includes support for the following Ethernet adapters:

     ISA non-PnP:

     +o	 BICC Isolan
     +o	 Novell	NE2100

     ISA PnP:

     +o	 AMD AM1500T/AM2100
     +o	 AMD PCnet-32
     +o	 AMD PCnet-ISA
     +o	 Allied	Telesyn	AT-1500
     +o	 Boca LANCard Combo
     +o	 Cabletron E2100 Series	DNI
     +o	 Cabletron E2200 Single	Chip
     +o	 Melco Inc. LGY-IV
     +o	 Novell	NE2100
     +o	 Racal InterLan	EtherBlaster

     The le driver does	not support the	selection of media types and options
     via ifconfig(8) with ISA bus Ethernet adapters.

     The PCI bus Ethernet chips	supported by the le driver are:

     +o	 AMD Am53C974/Am79C970/Am79C974	PCnet-PCI
     +o	 AMD Am79C970A PCnet-PCI II
     +o	 AMD Am79C971 PCnet-FAST
     +o	 AMD Am79C972 PCnet-FAST+
     +o	 AMD Am79C973/Am79C975 PCnet-FAST III
     +o	 AMD Am79C976 PCnet-PRO
     +o	 AMD Am79C978 PCnet-Home

     This includes support for the following Ethernet adapters:

     +o	 AcerLAN NIC P20
     +o	 Allied	Telesyn	AT-2450	and AT-2700 series
     +o	 VMware	emulated AMD Am79C970A PCnet-PCI II interface

     The le driver supports the	selection of the following media types via
     ifconfig(8) with PCI bus Ethernet adapters:

     autoselect	  Enable autoselection of the media type.

     10baseT/UTP  Select UTP media.

     10base5/AUI  Select AUI/BNC media.

     The following media option	is supported with these	media types:

     full-duplex  Select full duplex operation.

     Note that the le driver does not support selecting	100Mbps	(Fast Ether-
     net) media	types.

     le%d: overflow  More packets came in from the Ethernet than there was
     space in the LANCE	receive	buffers.  Packets were missed.

     le%d: receive buffer error	 The LANCE ran out of buffer space, packet

     le%d: lost	carrier	 The Ethernet carrier disappeared during an attempt to
     transmit.	The LANCE will finish transmitting the current packet, but
     will not automatically retry transmission if there	is a collision.

     le%d: excessive collisions, tdr %d	 The Ethernet was extremely busy or
     jammed, outbound packets were dropped after 16 attempts to	retransmit.

     TDR is the	abbreviation of	"Time Domain Reflectometry".  The optionally
     reported TDR value	is an internal counter of the interval between the
     start of a	transmission and the occurrence	of a collision.	 This value
     can be used to determine the distance from	the Ethernet tap to the	point
     on	the Ethernet cable that	is shorted or open (unterminated).

     le%d: dropping chained buffer  A packet did not fit into a	single receive
     buffer and	was dropped.  Since the	le driver allocates buffers large
     enough to receive maximum sized Ethernet packets, this means some other
     station on	the LAN	transmitted a packet larger than allowed by the	Ether-
     net standard.

     le%d: transmit buffer error  The LANCE ran	out of buffer space before
     finishing the transmission	of a packet.  If this error occurs, the	driver
     software has a bug.

     le%d: underflow  The LANCE	ran out	of buffer space	before finishing the
     transmission of a packet.	If this	error occurs, the driver software has
     a bug.

     le%d: controller failed to	initialize  Driver failed to start the LANCE.
     This is potentially a hardware failure.

     le%d: memory error	 RAM failed to respond within the timeout when the
     LANCE wanted to read or write it.	This is	potentially a hardware fail-

     le%d: receiver disabled  The receiver of the LANCE	was turned off due to
     an	error.

     le%d: transmitter disabled	 The transmitter of the	LANCE was turned off
     due to an error.

     altq(4), arp(4), intro(4),	netintro(4), vlan(4), ifconfig(8)

     The le driver was ported from NetBSD and first appeared in	FreeBSD	6.1.
     The NetBSD	version	in turn	was derived from the le	driver which first ap-
     peared in 4.4BSD.

     The le driver was ported by Marius	Strobl <>.

FreeBSD	13.0		       December	26, 2020		  FreeBSD 13.0


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