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$FreeBSD: releng/10.2/share/man/man4/gem.4 233648 2012-03-29 05:02:12Z eadler $
.Dd December 25, 2009 .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 Sun UltraSPARC machines.
p All controllers supported by the .Nm driver have TCP checksum offload capability for both receive and transmit, support for the reception and transmission of extended frames for .Xr vlan 4 and a 512-bit multicast hash filter. .Sh HARDWARE 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
p The following add-on cards are known to work with the .Nm driver at this time:
p l -bullet -compact t Sun Gigabit Ethernet PCI 2.0/3.0 (GBE/P) (part no. 501-4373) t Sun Gigabit Ethernet SBus 2.0/3.0 (GBE/S) (part no. 501-4375) .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 SEE ALSO .Xr altq 4 , .Xr miibus 4 , .Xr netintro 4 , .Xr vlan 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 for .Nx by .An Eduardo Horvath .Aq eeh@NetBSD.org . It was ported to .Fx by .An Thomas Moestl .Aq tmm@FreeBSD.org and later on improved by .An Marius Strobl .Aq marius@FreeBSD.org . The man page was written by .An Thomas Klausner .Aq wiz@NetBSD.org .