Power off ethernet device

[Nicola Salvemini]

Hello,

probably my question is
stupid, but I'm not an expert! I'm sorry for this!
I'm developing some
software on a development board based on AT91SAM9260 processor. I
need to power off the ethernet device, but I need a “low level”
command. I mean that an “ifconfig eth0 down” command is not
suffice to my purpose, I need a command to emulate a cable
disconnection, something to power off the yellow LED on the ethernet
port.
Maybe I have to implement
a function that uses some kernel functions, but I don't know where to
start. 
Could you please give me a
suggestion? 
Thanks in advance,

Nicola.


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