Power off ethernet device

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Hello,

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.

I'd like to implement an "application layer" function that uses  some kernel functions (maybe some physical abstract layer function), but I'm not very sure on how to proceed. 


Could you please give me a
suggestion? 
Thanks in advance,

Nicola.


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