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

NAME
     gem -- GEM 10/100/Gigabit Ethernet device

SYNOPSIS
     gem* at pci?
     gem* at sbus?
     bmtphy* at mii?
     brgphy* at mii?
     eephy* at mii?
     gentbi* at mii?
     luphy* at mii?
     lxtphy* at mii?

DESCRIPTION
     The gem driver provides support for various NICs based on the GEM Ether-
     net controller chips, including the following:

           o   Apple GMAC (10/100/1000baseT)
           o   Sun ERI (10/100baseT)
           o   Sun GEM (10/100/1000baseT)
           o   Sun GEM (1000baseSX)

     It uses an external PHY or an external 10-bit interface.

     The gem driver supports several media types, which are selected via the
     ifconfig(8) command.  The supported media types are:

           media autoselect
                  Attempt to autoselect the media type (default)

           media 1000baseT mediaopt full-duplex
                  Use 1000baseT on copper, full duplex

           media 1000baseT [mediaopt half-duplex]
                  Use 1000baseT on copper, half duplex

           media 1000baseSX mediaopt full-duplex
                  Use 1000baseSX on fiber, full duplex

           media 1000baseSX [mediaopt half-duplex]
                  Use 1000baseSX on fiber, half duplex

           media 100baseTX mediaopt full-duplex
                  Use 100baseTX, full duplex

           media 100baseTX [mediaopt half-duplex]
                  Use 100baseTX, half duplex

           media 10baseT mediaopt full-duplex
                  Use 10baseT, full duplex

           media 10baseT [mediaopt half-duplex]
                  Use 10baseT, half duplex

SEE ALSO
     arp(4), bmtphy(4), brgphy(4), eephy(4), gentbi(4), ifmedia(4), inet(4),
     intro(4), luphy(4), lxtphy(4), netintro(4), hostname.if(5), ifconfig(8)

HISTORY
     OpenBSD support for gem first appeared in OpenBSD 3.0.

BSD                            October 14, 2008                            BSD