GPGPUs (General Purpose Graphics Processing Unit) are becoming a relevant functional block on SoCs, particularly on the Arm ecosystem. Extracting full performance of a GPU is now becoming a combination of well integrated and optimized software and hardware. Motivated by that, there are many Open GPU initiatives around the world using FPGAs, but most (if not all) of these are on Intel platforms. This project aims to present an Open GPU based on an FPGA using the Arm Instruction Set. The driver platform adopted was the well know MESA 3D (www.mesa3d.org). We will describe the co-design approach to designing the OpenGPU. A functional demonstration of the OpenGPU working on a range of OpenGl applications ported by Linaro will be shown. On the fly we will change drivers between: SW only, GPU on Asic, and OpenGPU to see its performance impact. The engineers that implemented this system will be at the session to support detailed technical questions.