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Probably take a while because the A4 processor is essentially undocumented. Although, It's a Cortex A8 Core with a SGX535 GPU core which is documented by other manufactures



The majority of the opcodes is identical though, you should be able to infer the rest by inspecting the code, the 'unknown' opcodes and architecture details can usually be puzzled out like that.

Reverse engineering CPUs with unknown architectures like this has definitely been done before, and the fact that it has most of the major components identical with a documented set will only make that easier, after all, the changes should be relatively minor compared to the common parts.




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