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

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

SYNOPSIS
     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):

	   if_le_load="YES"

     For C-Bus non-PnP adapters, the port address and the IRQ number have to
     be	specified in /boot/device.hints:
     hint.le.0.at="isa"
     hint.le.0.port="0x03d0"
     hint.le.0.irq="6"

     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:
     hint.le.0.at="isa"
     hint.le.0.port="0x280"
     hint.le.0.irq="10"
     hint.le.0.drq="0"

DESCRIPTION
     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.  This includes a superset of the PCI bus
     Ethernet chips supported by the pcn(4) driver.  The le driver treats all
     of	these PCI bus Ethernet chips as	an AMD Am79C970	PCnet-PCI and does not
     support the additional features like the MII bus and burst	mode of	AMD
     Am79C971 PCnet-FAST and greater chips.  Thus the pcn(4) driver should be
     preferred for the latter.

     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.

HARDWARE
   C-Bus and ISA
     The le driver supports C-Bus and 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:

     C-Bus non-PnP:

     +o	 Contec	C-NET(98)S

     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 C-Bus	and ISA	bus Ethernet adapters.

   PCI
     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 unlike the pcn(4) driver, the le	driver does not	support
     selecting 100Mbps (Fast Ethernet) media types.

   sparc64
     The le driver supports the	on-board LANCE interfaces found	in Sun Ultra 1
     machines.	The le driver allows the selection of the following media
     types via ifconfig(8) with	these on-board interfaces:

     autoselect	  Enable autoselection of the media type.

     10baseT/UTP  Select UTP media.

     10base5/AUI  Select AUI media.

     When using	autoselection, a default media type is selected	for use	by
     examining all ports for carrier.  The first media type with which a car-
     rier is detected will be selected.	 Additionally, if carrier is dropped
     on	a port,	the driver will	switch between the possible ports until	one
     with carrier is found.

     The le driver also	supports the following Sun SBus	Ethernet add-on
     adapters:

     +o	 SCSI HBA and Buffered Ethernet	(SBE/S,	P/N 501-1869)
     +o	 Fast SCSI and Buffered	Ethernet (FSBE/S, P/N 501-2015 and 501-2981)

     The le driver does	not support the	selection of media types and options
     via ifconfig(8) with SBus Ethernet	add-on adapters.

     For further information on	configuring media types	and options, see
     ifconfig(8).

DIAGNOSTICS
     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
     dropped.

     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-
     ure.

     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.

SEE ALSO
     altq(4), arp(4), intro(4),	netintro(4), pcn(4), vlan(4), ifconfig(8)

HISTORY
     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
     appeared in 4.4BSD.

AUTHORS
     The le driver was ported by Marius	Strobl <marius@FreeBSD.org>.

FreeBSD	9.3		       January 20, 2007			   FreeBSD 9.3

NAME | SYNOPSIS | DESCRIPTION | HARDWARE | DIAGNOSTICS | SEE ALSO | HISTORY | AUTHORS

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