freebsd-dev/share/man/man4/gem.4

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.Dd September 2, 2006
.Dt GEM 4
.Os
.Sh NAME
.Nm gem
.Nd ERI/GEM/GMAC Ethernet device driver
.Sh SYNOPSIS
To compile this driver into the kernel,
place the following lines in your
kernel configuration file:
.Bd -ragged -offset indent
.Cd "device miibus"
.Cd "device gem"
.Ed
.Pp
Alternatively, to load the driver as a
module at boot time, place the following line in
.Xr loader.conf 5 :
.Bd -literal -offset indent
if_gem_load="YES"
.Ed
.Sh DESCRIPTION
The
.Nm
driver provides support for the GMac Ethernet hardware found mostly in
the last Apple PowerBooks G3s and most G4-based Apple hardware, as
well as many Sun UltraSPARCs.
.Sh HARDWARE
.Pp
Chips supported by the
.Nm
driver include:
.Pp
.Bl -bullet -compact
.It
Apple GMAC
.It
Sun ERI 10/100 Mbps Ethernet
.It
Sun GEM Gigabit Ethernet
.El
.Sh NOTES
On sparc64 the
.Nm
driver respects the
.Va local-mac-address?
system configuration variable which can be set in the Open Firmware boot
monitor using the
.Ic setenv
command or by
.Xr eeprom 8 .
If set to
.Dq Li false
(the default), the
.Nm
driver will use the system's default MAC address for all of its devices.
If set to
.Dq Li true ,
the unique MAC address of each interface is used if present rather than
the system's default MAC address.
.Pp
Supported interfaces having their own MAC address include the on-board
Sun ERI 10/100 Mbps on boards equipped with more than one Ethernet interface
and the Sun Gigabit Ethernet 2.0/3.0 GBE add-on cards.
.Sh CAVEATS
Currently the
.Nm
driver fails to attach to Sun Gigabit Ethernet 2.0/3.0 (GBE/P) cards,
as the SERDES used on these cards is not supported so far.
The
.Nm
driver will also fail to probe and attach to Sun Gigabit Ethernet 2.0/3.0 (GBE/S) cards,
as no SBus front-end has been written so far.
.Sh SEE ALSO
.Xr hme 4 ,
.Xr miibus 4 ,
.Xr netintro 4 ,
.Xr eeprom 8 ,
.Xr ifconfig 8
.Sh HISTORY
The
.Nm
device driver appeared in
.Nx 1.6 .
The first
.Fx
version to include it was
.Fx 5.0 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was written by
.An Eduardo Horvath
.Aq eeh@NetBSD.org .
The man page was written by
.An Thomas Klausner
.Aq wiz@NetBSD.org .