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

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

SYNOPSIS
     device miibus
     device gem

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 many Sun UltraSPARCs.

HARDWARE
     Cards supported by gem driver include:

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

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
     devices.  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 and GEM gigabit Ethernet Interfaces on boards
     equipped with more than one Ethernet interface and the Sun GEM gigabit
     Ethernet add-on cards.

SEE ALSO
     hme(4), miibus(4), netintro(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 by Eduardo Horvath <eehATNetBSD.org>.  The man
     page was written by Thomas Klausner <wizATNetBSD.org>.

BSD                             August 15, 2004                            BSD