[ARM] .init_array section

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".init_array" Section ".fini_array"
.init_array contains pointers to blocks of code that need to be executed when an application is being initialized (before main() is called). It is used for a number of things, but the primary use is in C++ for running static constructors; a secondary use that is sometimes used is to initialize IO systems in the C library.
If you are not using C++ you may (depending on your C library) be able to live without it entirely; but you'd need to hack your startup code to deal with this.
.init_array probably ends up in ram because its marked read/write -- that happens because in a dynamic linking environment the dynamic linker has to fix up all the pointers it contains before it can be used. In a static environment you might be able to get away with forcing it into a read-only section.