I heard that, embedded systems like arm have only one memory pool. CPU and GPU share it. I though there might be some unified memory access there. But I am wrong. Arm (android/ios) GPUs work in the same way as integrated graphic cards in PC. RAM and VRAM are still separated logically. At least there is not such an API to let GPU access main memory directly. Data copying is still required.
AMD kaveri APU seems to break this rules on Jan 14 2014. Let us see.
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