Do not use memcpy in Device Memory.
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.faqs/ka15414.html
Library built with Unaligned access flag.
https://bugs.launchpad.net/gcc-arm-embedded/+bug/1303369
So, no other way except changing the Device memory into Non-cached memory and use sync instructions.
Never set Device memory as Ethernet Buffer. You will be in trouble!
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