ARM Linker
RW section is compressed in image the decompressed at loading.
http://www.keil.com/support/man/docs/armlink/armlink_pge1362065930871.htm
RW data areas typically contain a large number of repeated values, such as zeros, that makes them suitable for compression.
RW data compression is enabled by default to minimize ROM size.
The linker compresses the data. This data is then decompressed on the target at run time.
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