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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 82542, 82543 and	82544 ethernet controller chip.	 The driver
     supports Transmit/Receive checksum	offload	and jumbo frames only on 82543
     and 82544-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 9000.

     The em driver supports the	following media	types:

     autoselect	  Enables auto-negotiation for speed and duplex.

     10baseT/UTP  Sets 10Mbps operation.  The mediaopt option can also be used
		  to select either full-duplex or half-duplex modes.

     100baseTX	  Sets 100Mbps operation.  The mediaopt	option can also	be
		  used to select either	full-duplex or half-duplex modes.

     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.

     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: No memory for jumbo buffers!	 The driver failed to allocate memory
     for jumbo frames during initialization.

     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), netintro(4), ng_ether(4), vlan(4),	ifconfig(8)

HISTORY
     The em device driver first	appeared in FreeBSD 4.5.

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

FreeBSD	10.1		       December	8, 2001			  FreeBSD 10.1

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

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