FreeBSD manual
download PDF document: if_gem.4.pdf
GEM(4) FreeBSD Kernel Interfaces Manual GEM(4)
NAME
gem - 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 hardware.
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 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)
SEE ALSO
altq(4), miibus(4), netintro(4), vlan(4), 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>.
FreeBSD 14.0-RELEASE-p11 April 18, 2023 FreeBSD 14.0-RELEASE-p11