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Why MIO7 you may ask? This is the most famous Zynq LED number ever seven: MIO7 is one of two MIO pins that are usable as OUTPUT Only and also in almost all Zynq designs MIO7 is in 3.3V MIO bank, so it is first candidate for a "User LED". In TE0720 MIO7 is connected to System Controller that as default connects to a LED. But the System Controller could also use the MIO7 as some signal from Zynq ARM Core, or route the MIO7 back to the Zynq PL Fabric, or use the MIO7 as FORCE reset or something else.

So what about the LED on the 7045 board? As I have not updated the Kernel there, the LED Class is not available, so I have to-do it the old fashion GPIO way:

cd /sys/class/gpio
echo 7 > export
cd gpio7
echo out > direction
echo 1 > value
 

And the LED on below 7045 is on as well...

Image Added

Zedboard OOB Design

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!). 

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