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NetBSD 6.1.5 - man page for gem (netbsd section 4)

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GEM(4)				   BSD Kernel Interfaces Manual 			   GEM(4)

     gem -- ERI/GEM/GMAC Ethernet device driver

     gem* at pci? dev ? function ?
     gem* at sbus? slot ? offset ?

     Configuration of PHYs may also be necessary.  See mii(4).

     The gem 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.

     Cards supported by this driver include:
	   o   Sun GEM gigabit ethernet (SX fibre variants)
	   o   Sun ERI 10/100
	   o   Apple GMAC

     The GEM family supports hardware checksumming to assist in computing IPv4 TCP checksums.
     The gem driver supports this feature of the chip.	See ifconfig(8) for information on how to
     enable this feature.

     bmtphy(4), ifmedia(4), intro(4), mii(4), ifconfig(8)

     Sun Microsystems, GEM Gigabit Ethernet ASIC Specification,

     Sun Microsystems, Sbus GEM Specification,

     The gem device driver appeared in NetBSD 1.6.  Support for PCI SX fibre cards was added in
     NetBSD 5.0.  Support for SBus SX fibre cards was added in NetBSD 5.0.

     The gem driver was written by Eduardo Horvath <eeh@NetBSD.org>.  SX fibre support was added
     by Julian Coleman <jdc@NetBSD.org>.  The man page was written by Thomas Klausner

     The hardware checksumming support does not support IPv4 UDP, although this was allowed prior
     to NetBSD 5.0.  Also, the hardware IPv4 TCP receive checksumming support has bugs, so this
     is disabled.

     On the SX fibre variants of the hardware, the link will stay down if there is a duplex mis-
     match.  Also, packet transmission may fail when in half-duplex mode.

BSD					September 15, 2008				      BSD
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