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The Global Configuration Unit (GCU) manages the 3 gigabit MACs that
are baked onto the Intel EP80579 SoC. The GCU is registered as a
device on the PCI bus and the driver handles the init, probe, and
removal of the device as well as entering into ACPI power sleep
states.
Any number of PHYs can be attached to the MACs in order to connect
to a network. Support for the following PHYs is addded via the
e1000_oem_phy portion of the addition:
Intel M88E1000
Intel M88E1011
Intel IGP01E1000
Intel M88E1141
Vitesse VSC8211
Vitesse VSC8601
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