Great Article on GPU Science on HSA Foundation based on Moor Insights and Strategy White Paper.
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Moor Insights and Strategy was commissioned by the AMD to produce a report  “Heterogeneous System Architecture (HSA): Purpose and Outlook”.
The HSA (Heterogeneous System Architecture) Foundation, known as the “HSAF”, is an open, industry standard consortium founded to define and deliver open standards and tools for hardware and software to fully take advantage of high performance of parallel compute engines, and do so in the lowest possible power envelope. This new environment will enable rich new user experiences never been seen before, and done at incredibly low power.
read more at
http://gpuscience.com/cs/heterogeneous-system-architecture-purpose-and-outlook/