As the robotic industry is growing boomingly, the functionalities and system's architecture of robots are more and more complex. The development of robotic application system becomes a time-consuming and difficult task. In this paper, we propose an embedded computing platform for intelligent robot, and then design a reliable real-time operating system (RTOS) on the platform for rapid developing intelligent robotic applications. The proposed embedded computing platform includes a reconfigurable 8-bits processor core and some robot-dedicated hardware intellectual property (IP) which can be generated and reconfigured easily. Based on the embedded processor core, a real-time OS, uC/OS-II, is ported to this platform. The RTOS is adjusted and optimized due to the robot-specific requirements and the hardware resources constrains. Finally, a simple example is applied to demonstrate the software/hardware (SW/HW) co-design flow based on the proposed platform.