How to place RAM func in GCC environment???

It is so easy to place a function in RAM when you use IAR EWARM, all you have to do is  put one magical word. Then, EWARM do automatically handle the function and place it in RAM. Now, how about MCUXpresso IDE? that is a GCC environment, how can you do that? This time, I will give you a hint how you can place a function in RAM in case of GCC environment.

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