Is it possible to call a function from another image on MPC5674F(NXP PPC)?

Question

My question is explained below.

1. Build the main image.
2. Download main image using JTAG.
3. Build the application image.
4. Download app image using RS232.
5. Run main image.
6. Call the func_a in the application image from the main().

Is it possible on this system? Please let me know what to do if possible.

Thank you, Regards, Henk