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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 11.1 January 5, 2005 FreeBSD 11.1
NAME | SYNOPSIS | DESCRIPTION | DIAGNOSTICS | SUPPORT | SEE ALSO | HISTORY | AUTHORS
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