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Cortex M4 vs Cortex A9

Mohamed Jauhar
Note: This was originally posted on 11th October 2012 at http://forums.arm.com

What are the main difference between these two processors  

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  • +1 Arm Employee Badge
    Note: This was originally posted on 11th October 2012 at http://forums.arm.com

    None of the Cortex-M series processors support NEON. 

    In terms of running ARM9 or Cortex-A9 code on a Cortex-M4, depends on what you mean.  If you mean at a source level, then C/C++ code should be portable, you'll just have to re-build.  What wouldn;t be portable is system code (e.g. code to handle exceptions or memory management) as these are totally different on the ARM9/Cortex-A9 vs the Cortex-M4.

    Practically running the same binaries is not going to work.  But also, I don't see where it really would be desirable.
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  • +1 Arm Employee Badge
    Note: This was originally posted on 11th October 2012 at http://forums.arm.com

    None of the Cortex-M series processors support NEON. 

    In terms of running ARM9 or Cortex-A9 code on a Cortex-M4, depends on what you mean.  If you mean at a source level, then C/C++ code should be portable, you'll just have to re-build.  What wouldn;t be portable is system code (e.g. code to handle exceptions or memory management) as these are totally different on the ARM9/Cortex-A9 vs the Cortex-M4.

    Practically running the same binaries is not going to work.  But also, I don't see where it really would be desirable.
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