How to place a 'function' using scatter file.

i have to place one function at specific address using scatter file please give me any idea.

Means i have 2 scatter file so i want to call from 1st scatter file to 2nd scatter file 'function'.

in the 1st scatter memory reason my function call is there and 2nd scatter memory reason my function definition

so i have to link them at run time.

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