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

 

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:
 
            AMD Am7990 and Am79C90 LANCE
            AMD Am79C960 PCnet-ISA
            AMD Am79C961 PCnet-ISA+
            AMD Am79C961A PCnet-ISA II
 
      This includes support for the following Ethernet adapters:
 
      C-Bus non-PnP:
 
            Contec C-NET(98)S
 
      ISA non-PnP:
 
            BICC Isolan
            Novell NE2100
 
      ISA PnP:
 
            AMD AM1500T/AM2100
            AMD PCnet-32
            AMD PCnet-ISA
            Allied Telesyn AT-1500
            Boca LANCard Combo
            Cabletron E2100 Series DNI
            Cabletron E2200 Single Chip
            Melco Inc. LGY-IV
            Novell NE2100
            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:
 
            AMD Am53C974/Am79C970/Am79C974 PCnet-PCI
            AMD Am79C970A PCnet-PCI II
            AMD Am79C971 PCnet-FAST
            AMD Am79C972 PCnet-FAST+
            AMD Am79C973/Am79C975 PCnet-FAST III
            AMD Am79C976 PCnet-PRO
            AMD Am79C978 PCnet-Home
 
      This includes support for the following Ethernet adapters:
 
            AcerLAN NIC P20
            Allied Telesyn AT-2450 and AT-2700 series
            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:
 
            SCSI HBA and Buffered Ethernet (SBE/S, P/N 501-1869)
            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.
      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〉.
 

Sections

Based on BSD UNIX
FreeBSD is an advanced operating system for x86 compatible (including Pentium and Athlon), amd64 compatible (including Opteron, Athlon64, and EM64T), UltraSPARC, IA-64, PC-98 and ARM architectures. It is derived from BSD, the version of UNIX developed at the University of California, Berkeley. It is developed and maintained by a large team of individuals. Additional platforms are in various stages of development.