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EM(4)                  FreeBSD Kernel Interfaces Manual                  EM(4)

NAME
     em - Intel(R) PRO/1000 Gigabit Ethernet driver for the FreeBSD operating
     system

SYNOPSIS
     device em

DESCRIPTION
     The em driver provides support for PCI Gigabit Ethernet adapters based on
     the Intel 82540, 82541PI, 82542, 82543, 82544, 82546, 82546EB and 82547
     Ethernet controller chips.  The driver supports Transmit/Receive checksum
     offload and Jumbo Frames only on 82540, 82543, 82544 and 82546-based
     adapters.  For further hardware information, see the README included with
     the driver.

     For questions related to hardware requirements, refer to the
     documentation supplied with your Intel PRO/1000 adapter.  All hardware
     requirements listed apply to use with FreeBSD.

     Support for Jumbo Frames is provided via the interface MTU setting.
     Selecting an MTU larger than 1500 bytes with the ifconfig(8) utility
     configures the adapter to receive and transmit Jumbo Frames.  The maximum
     MTU size for Jumbo Frames is 16114.

     This driver version supports VLANs.  For information on enabling VLANs,
     see the README.  The em driver supports the following media types:

     autoselect       Enables auto-negotiation for speed and duplex.

     10baseT/UTP      Sets 10Mbps operation.  Use the mediaopt option to
                      select full-duplex mode.

     100baseTX        Sets 100Mbps operation.  Use the mediaopt option to
                      select full-duplex mode.

     1000baseSX       Sets 1000Mbps operation.  Only full-duplex mode is
                      supported at this speed.

     1000baseTX       Sets 1000Mbps operation.  Only full-duplex mode is
                      supported at this speed.

     The em driver supports the following media options:

     full-duplex      Forces full-duplex operation

     half-duplex      Forces half-duplex operation.

     Only use mediaopt to set the driver to full-duplex.  If mediaopt is not
     specified, the driver defaults to half-duplex.

     For more information on configuring this device, see ifconfig(8).

HARDWARE
     The em driver supports Gigabit Ethernet adapters based on the Intel
     82540, 82541PI, 82542, 82543, 82544, 82546, 82546EB and 82547 controller
     chips:

     +o   Intel PRO/1000 CT Network Connection (82547)
     +o   Intel PRO/1000 F Server Adapter (82543)
     +o   Intel PRO/1000 Gigabit Server Adapter (82542)
     +o   Intel PRO/1000 GT Desktop Adapter (82541PI)
     +o   Intel PRO/1000 MF Dual Port Server Adapter (82546)
     +o   Intel PRO/1000 MF Server Adapter (82545)
     +o   Intel PRO/1000 MF Server Adapter (LX) (82545)
     +o   Intel PRO/1000 MT Desktop Adapter (82540)
     +o   Intel PRO/1000 MT Desktop Adapter (82541)
     +o   Intel PRO/1000 MT Dual Port Server Adapter (82546)
     +o   Intel PRO/1000 MT Quad Port Server Adapter (82546EB)
     +o   Intel PRO/1000 MT Server Adapter (82545)
     +o   Intel PRO/1000 T Desktop Adapter (82544)
     +o   Intel PRO/1000 T Server Adapter (82543)
     +o   Intel PRO/1000 XF Server Adapter (82544)
     +o   Intel PRO/1000 XT Server Adapter (82544)

DIAGNOSTICS
     em%d: Unable to allocate bus resource: memory  A fatal initialization
     error has occurred.

     em%d: Unable to allocate bus resource: interrupt  A fatal initialization
     error has occurred.

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

SUPPORT
     For additional information regarding building and installation, see the
     README included with the driver.  For general information and support, go
     to the Intel support website at: http://support.intel.com.

     If an issue is identified with the released source code on the supported
     kernel with a supported adapter, email the specific information related
     to the issue to <freebsdnic@mailbox.intel.com>.

SEE ALSO
     arp(4), gx(4), netintro(4), ng_ether(4), vlan(4), ifconfig(8)

HISTORY
     The em device driver first appeared in FreeBSD 4.4.

AUTHORS
     The em driver was written by Intel Corporation
     <freebsdnic@mailbox.intel.com>.

FreeBSD 11.0-PRERELEASE        September 5, 2004       FreeBSD 11.0-PRERELEASE

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

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<https://www.freebsd.org/cgi/man.cgi?query=em&manpath=FreeBSD+5.3-RELEASE+and+Ports>

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