GEM(4)               OpenBSD Programmer's Manual (SPARC64)              GEM(4)

NAME
     gem - SPARC64 GEM gigabit ethernet interface

SYNOPSIS
     gem* at pci? dev ? function ?
     nsphy* at mii? phy ?
     qsphy* at mii? phy ?

DESCRIPTION
     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 GMAC board.

     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, in Full Duplex, then Half Duplex mode.

     The gem supports several media types, which are selected via the ifcon-
     fig(8) command.  The supported media types are:

           media autoselect  Attempt to autoselect the media type (default)

           media 1000baseTX mediaopt full-duplex
                             Use 1000baseSX on copper, full duplex

           media 1000baseTX [mediaopt half-duplex]
                             Use 1000baseSX 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), ie(4), ifmedia(4), inet(4), intro(4), le(4), ifconfig(8)

HISTORY
     OpenBSD support for the gem first appeared in OpenBSD 3.0.

OpenBSD 3.0                     October 5, 2001                              1
