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The SD Card images delivered with zedboard (and available as OOB SD Card images) include a kernel 3.09 with GPIO-LEDS enabled on MIO7 with default trigger set to MMC (SD Card) activity. Writing none to LED trigger would allow direct programmatic control over MIO7 LED on zedboard (labelled LD9!). 

As newer Linux kernels for Xilinx seem to have the GPIO LED class not enabled by default it may not be possible to use Linux LED class on zedboard (if using standard kernels).

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