NAME    [Toc]    [Back]

     gem - GEM Gigabit Ethernet interface

SYNOPSIS    [Toc]    [Back]

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

DESCRIPTION    [Toc]    [Back]

     The gem interface provides access to the 10Mb/s, 100Mb/s and
1Gb/s Ethernet
  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 Ethernet
 addresses on the local network.

     When  a gem interface is brought up, by default, it will attempt to autonegotiate
 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

SEE ALSO    [Toc]    [Back]

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

HISTORY    [Toc]    [Back]

     OpenBSD support for gem first appeared in OpenBSD 3.0.

OpenBSD      3.6                          October     5,     2001