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    Command:

    gem

    
         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
         capability 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:
    
         ?   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
         time:
    
         ?   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)
    
    
    

    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 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.
    
    
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