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

NAME
     em	-- Intel(R) PRO/1000 Gigabit Ethernet adapter driver

SYNOPSIS
     device em

DESCRIPTION
     The em driver provides support for	PCI gigabit Ethernet adapters based on
     the Intel 82540, 82541, 82541ER, 82542, 82543, 82544, 82545, 82546,
     82546GB and 82547 Ethernet	controller chips.  The driver does not support
     Transmit/Receive checksum offload and Jumbo Frames	on 82542-based
     adapters.	For a list of supported	adapters, see the README included with
     the driver.

     For questions related to hardware requirements, refer to the documenta-
     tion supplied with	your Intel PRO/1000 adapter.  All hardware require-
     ments 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 con-
     figures 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 both full-duplex and half-duplex.  Use mediaopt to
     force the driver to either	of these settings.  Note that the only valid
     parameter for mediaopt is full-duplex; to force the driver	to half-duplex
     when running at less than gibabit speed, leave mediaopt unspecifed.

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

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), polling(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	10.1			January	5, 2005			  FreeBSD 10.1

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

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