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gem(4) [netbsd man page]

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

NAME
gem -- ERI/GEM/GMAC Ethernet device driver SYNOPSIS
gem* at pci? dev ? function ? gem* at sbus? slot ? offset ? Configuration of PHYs may also be necessary. See mii(4). DESCRIPTION
The gem driver provides support for the GMac Ethernet hardware found mostly in the last Apple PowerBooks G3s and most G4-based Apple hard- ware, 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. SEE ALSO
bmtphy(4), ifmedia(4), intro(4), mii(4), ifconfig(8) Sun Microsystems, GEM Gigabit Ethernet ASIC Specification, http://www.sun.com/processors/manuals/ge.pdf. Sun Microsystems, Sbus GEM Specification, http://mediacast.sun.com/users/Barton808/media/gem_sbus-1.pdf. HISTORY
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. AUTHORS
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 <wiz@NetBSD.org>. BUGS
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 mismatch. Also, packet transmission may fail when in half-duplex mode. BSD
September 15, 2008 BSD

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

NAME
gem -- ERI/GEM/GMAC Ethernet device driver SYNOPSIS
To compile this driver into the kernel, place the following lines in your kernel configuration file: device miibus device gem Alternatively, to load the driver as a module at boot time, place the following line in loader.conf(5): if_gem_load="YES" DESCRIPTION
The gem driver provides support for the GMAC Ethernet hardware found mostly in the last Apple PowerBooks G3s and most G4-based Apple hard- ware, as well as Sun UltraSPARC machines. All controllers supported by the gem driver have TCP checksum offload capability for both receive and transmit, support for the reception and transmission of extended frames for vlan(4) and a 512-bit multicast hash filter. HARDWARE
Chips supported by the gem driver include: o Apple GMAC o Sun ERI 10/100 Mbps Ethernet o Sun GEM Gigabit Ethernet The following add-on cards are known to work with the gem driver at this time: o Sun Gigabit Ethernet PCI 2.0/3.0 (GBE/P) (part no. 501-4373) o Sun Gigabit Ethernet SBus 2.0/3.0 (GBE/S) (part no. 501-4375) NOTES
On sparc64 the gem driver respects the local-mac-address? system configuration variable which can be set in the Open Firmware boot monitor using the setenv command or by eeprom(8). If set to ``false'' (the default), the gem driver will use the system's default MAC address for all of its devices. If set to ``true'', the unique MAC address of each interface is used if present rather than the system's default MAC address. 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. SEE ALSO
altq(4), miibus(4), netintro(4), vlan(4), eeprom(8), ifconfig(8) HISTORY
The gem device driver appeared in NetBSD 1.6. The first FreeBSD version to include it was FreeBSD 5.0. AUTHORS
The gem driver was written for NetBSD by Eduardo Horvath <eeh@NetBSD.org>. It was ported to FreeBSD by Thomas Moestl <tmm@FreeBSD.org> and later on improved by Marius Strobl <marius@FreeBSD.org>. The man page was written by Thomas Klausner <wiz@NetBSD.org>. BSD December 25, 2009 BSD
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