Command Section
GEM(4)                 FreeBSD Kernel Interfaces Manual                 GEM(4)

     gem - ERI/GEM/GMAC Ethernet device driver

     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):


     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
     capability for both receive and transmit, support for the reception and
     transmission of extended frames for vlan(4) and a 512-bit multicast hash

     Chips supported by the gem driver include:

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

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

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

     On sparc64 the gem driver respects the local-mac-address? system
     configuration 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

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

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

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

     The gem driver was written for NetBSD by Eduardo Horvath
     <[email protected]>.  It was ported to FreeBSD by Thomas Moestl
     <[email protected]> and later on improved by Marius Strobl
     <[email protected]>.  The man page was written by Thomas Klausner
     <[email protected]>.

FreeBSD 11.1-RELEASE-p4        December 25, 2009       FreeBSD 11.1-RELEASE-p4
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