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.Dd February 1, 2007 .Dt GEM 4 .Os .Sh NAME .Nm gem .Nd ERI/GEM/GMAC Ethernet device driver .Sh SYNOPSIS .Cd "gem* at pci? dev ? function ?" .Cd "gem* at sbus? slot ? offset ?"
p Configuration of PHYs may also be necessary. See .Xr mii 4 . .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.
p Cards supported by this driver include: l -bullet -compact -offset indent t Sun GEM gigabit ethernet (including SX fibre variants) t Sun ERI 10/100 t Apple GMAC .El
p The GEM family supports hardware checksumming to assist in computing IPv4 TCP checksums. The .Nm driver supports this feature of the chip. See .Xr ifconfig 8 for information on how to enable this feature. .Sh SEE ALSO .Xr bmtphy 4 , .Xr ifmedia 4 , .Xr intro 4 , .Xr mii 4 , .Xr ifconfig 8 .Rs .%T "GEM Gigabit Ethernet ASIC Specification" .%A Sun Microsystems .%O http://www.sun.com/processors/manuals/ge.pdf .Re .Sh HISTORY The .Nm device driver appeared in .Nx 1.6 . .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 . .Sh BUGS The hardware checksumming support does not support IPv4 UDP, although this was allowed prior to .Nx 5 . Also, the hardware IPv4 TCP receive checksumming support has bugs, so this is disabled.
p On the SX fibre variants of the hardware, the link will stay down if there is a duplex mismatch. Also, packet transmission may fail when in .Cm half-duplex mode.