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GEM(4)			 BSD Kernel Interfaces Manual			GEM(4)

NAME
     gem -- ERI/GEM/GMAC Ethernet device driver

SYNOPSIS
     To	compile	this driver into the kernel, place the following lines in your
     kernel configuration file:

	   device miibus
	   device gem

     Alternatively, to load the	driver as a module at boot time, place the
     following line in loader.conf(5):

	   if_gem_load="YES"

DESCRIPTION
     The gem driver provides support for the GMAC Ethernet hardware found
     mostly in the last	Apple PowerBooks G3s and most G4-based Apple hardware,
     as	well as	Sun UltraSPARC machines.

     All controllers supported by the gem driver have TCP checksum offload ca-
     pability for both receive and transmit, support for the reception and
     transmission of extended frames for vlan(4) and a 512-bit multicast hash
     filter.

HARDWARE
     Chips supported by	the gem	driver include:

     o	 Apple GMAC
     o	 Sun ERI 10/100	Mbps Ethernet
     o	 Sun GEM Gigabit Ethernet

     The following add-on cards	are known to work with the gem driver at this
     time:

     o	 Sun Gigabit Ethernet PCI 2.0/3.0 (GBE/P) (part	no. 501-4373)
     o	 Sun Gigabit Ethernet SBus 2.0/3.0 (GBE/S) (part no. 501-4375)

NOTES
     On	sparc64	the gem	driver respects	the local-mac-address? system configu-
     ration variable which can be set in the Open Firmware boot	monitor	using
     the setenv	command	or by eeprom(8).  If set to "false" (the default), the
     gem driver	will use the system's default MAC address for all of its de-
     vices.  If	set to "true", the unique MAC address of each interface	is
     used if present rather than the system's default MAC address.

     Supported interfaces having their own MAC address include the on-board
     Sun ERI 10/100 Mbps on boards equipped with more than one Ethernet	inter-
     face and the Sun Gigabit Ethernet 2.0/3.0 GBE add-on cards.

SEE ALSO
     altq(4), miibus(4), netintro(4), vlan(4), eeprom(8), ifconfig(8)

HISTORY
     The gem device driver appeared in NetBSD 1.6.  The	first FreeBSD version
     to	include	it was FreeBSD 5.0.

AUTHORS
     The gem driver was	written	for NetBSD by Eduardo Horvath
     <eeh@NetBSD.org>.	It was ported to FreeBSD by Thomas Moestl
     <tmm@FreeBSD.org> and later on improved by	Marius Strobl
     <marius@FreeBSD.org>.  The	man page was written by	Thomas Klausner
     <wiz@NetBSD.org>.

BSD			       December	25, 2009			   BSD
NAME | SYNOPSIS | DESCRIPTION | HARDWARE | NOTES | SEE ALSO | HISTORY | AUTHORS

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