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The functions represent ARM "thunk" code that can be invoked via
FEL to execute arbitrary memory copy operations on the target
device, i.e. they deal with overlap and unaligned access. Where
possible, the copy operation will use (32-bit) word transfers,
otherwise it falls back to bytewise copying.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>