The VC4 GPU actually is the primary chip; it boots the ThreadX operating system on the VC4 first, then ThreadX loads the user-configured system onto the ARM cor

The VC4 GPU actually is the primary chip; it boots the ThreadX operating system on the VC4 first, then ThreadX loads the user-configured system onto the ARM core. Whether you run headless or not, ThreadX is running on the VC4.