MirBSD manpage: gem(4)

GEM(4)                     BSD Programmer's Manual                      GEM(4)


     gem - GEM gigabit ethernet interface


     gem* at pci? dev ? function ?
     bmtphy* at mii? phy ?
     brgphy* at mii? phy ?
     eephy* at mii? phy ?
     lxtphy* at mii? phy ?


     The gem interface provides access to the 10Mb/s, 100Mb/s and 1Gb/s Ether-
     net networks. The gem is found on the Sun GEM and ERI 10/100 boards, as
     well as the Apple internal GMAC ethernet.

     Each of the host's network addresses is specified at boot time with an
     SIOCSIFADDR ioctl(2). The gem interface employs the address resolution
     protocol described in arp(4) to dynamically map between Internet and Eth-
     ernet addresses on the local network.

     When a gem interface is brought up, by default, it will attempt to auto-
     negotiate the link speed and duplex. The speeds are tried in descending
     order; first in full duplex mode, then half duplex.

     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


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


     OpenBSD support for gem first appeared in OpenBSD 3.0.

MirBSD #10-current             October 5, 2001                               1

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