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  1. Greetings everybody, I recently purchased a Zybo (Zynq 7000 series application board), currently I am experimenting around with it a bit. This is the first time I am working with FPGAs, up to now I have only been working with other microcontrollers and cortex processors. While looking for reading material, I stumbled across this example, which shows how to create and use custom IP cores using Vivado. Since it is an official example from digilent and other examples worked without problems I though this one would be easy to follow, too. Problem is, it doesn't work. I am following each and every step exactly as shown in the pictures and described in the text. After successfully generating the bitstream (no warnings/errors) and exporting it I run the SDK. The C code there compiles, too, I program the FPGA and launch the compiled ELF using GDB on the Zynq. Here I first have to turn off the "Run ps7_init" and "Run ps7_post_config" checkboxes in the run configuration, otherwise the elf won't run on the Zynq. Now the ELF runs on the Zynq (or at least I hope so...), but nothing happens. Nothing at all. The LEDs are supposed to start pulsing, but they don't. Does anybody have similar experience with the given example? Or can anyone tell me what's wrong or how to find out? I'm greatful for any help you might have to offer. I currently am using Vivado 2015.4 (64 bit). Best regards, Daniel