.\"	$OpenBSD: gem.4,v 1.20 2022/03/21 14:56:16 miod Exp $
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.\" Copyright (c) 2001 Miodrag Vallat.
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.Dd $Mdocdate: March 21 2022 $
.Dt GEM 4
.Os
.Sh NAME
.Nm gem
.Nd GEM 10/100/1Gb Ethernet device
.Sh SYNOPSIS
.Cd "gem* at pci?"
.Cd "gem* at sbus?"
.Cd "bmtphy* at mii?"
.Cd "brgphy* at mii?"
.Cd "eephy* at mii?"
.Cd "gentbi* at mii?"
.Cd "luphy* at mii?"
.Cd "lxtphy* at mii?"
.Sh DESCRIPTION
The
.Nm
driver provides support for various NICs based on the GEM Ethernet controller
chips, including the following:
.Pp
.Bl -bullet -compact -offset indent
.It
Apple GMAC (10/100/1000baseT)
.It
Sun ERI (10/100baseT)
.It
Sun GEM (10/100/1000baseT)
.It
Sun GEM (1000baseSX)
.El
.Pp
It uses an external PHY or an external 10-bit interface.
.Pp
The
.Nm
driver supports several media types, which are selected via the
.Xr ifconfig 8
command.
The supported media types are:
.Bl -tag -width "media" -offset indent
.It Cm media No autoselect
Attempt to autoselect the media type (default)
.It Cm media No 1000baseT Cm mediaopt No full-duplex
Use 1000baseT on copper, full duplex
.It Cm media No 1000baseT Cm mediaopt No half-duplex
Use 1000baseT on copper, half duplex
.It Cm media No 1000baseSX Cm mediaopt No full-duplex
Use 1000baseSX on fiber, full duplex
.It Cm media No 1000baseSX Cm mediaopt No half-duplex
Use 1000baseSX on fiber, half duplex
.It Cm media No 100baseTX Cm mediaopt No full-duplex
Use 100baseTX, full duplex
.It Cm media No 100baseTX Cm mediaopt No half-duplex
Use 100baseTX, half duplex
.It Cm media No 10baseT Cm mediaopt No full-duplex
Use 10baseT, full duplex
.It Cm media No 10baseT Cm mediaopt No half-duplex
Use 10baseT, half duplex
.El
.Sh SEE ALSO
.Xr arp 4 ,
.Xr bmtphy 4 ,
.Xr brgphy 4 ,
.Xr eephy 4 ,
.Xr gentbi 4 ,
.Xr ifmedia 4 ,
.Xr inet 4 ,
.Xr intro 4 ,
.Xr luphy 4 ,
.Xr lxtphy 4 ,
.Xr netintro 4 ,
.Xr hostname.if 5 ,
.Xr ifconfig 8
.Sh HISTORY
.Ox
support for
.Nm
first appeared in
.Ox 3.0 .