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Copy a function from SRAM to flash and execute from flash

Hello,
what I would like to do is to copy a function from SRAM to flash and decide in the main if I want to execute from flash or from SRAM.
What I observed it is that if this function is calling a subroutine placed in SRAM, when I execute it from flash the jump will not be set correctly: it will try to jump to a subroutine placed in flash, but this function is located in SRAM!!!
What can I do to have the correct address when I execute from flash?
I tried with the PI qualifiers ropi, but it does not work...
I am using a device with Cortex M4

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