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$FreeBSD: head/share/man/man4/gem.4 170285 2007-06-04 16:59:11Z brueffer $
.Dd June 4, 2007 .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: d -ragged -offset indent .Cd "device miibus" .Cd "device gem" .Ed
p Alternatively, to load the driver as a module at boot time, place the following line in .Xr loader.conf 5 : d -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
p Chips supported by the .Nm driver include:
p l -bullet -compact t Apple GMAC t Sun ERI 10/100 Mbps Ethernet t 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 c 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.
p 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 altq 4 , .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 .