my recommendation is - do not modify original project. Create new project for MPC5644A and then import the drivers and update main.c file.
There are chip specific initializations which are different - size of SRAM for initialization, flash wait states... It's much easier to start with new empty project.
Thank you very much. I do created the new project for MPC5644A. Question is I don't konw how to import the drivers and update main.c. I tried for several times, then program cannot go to main(), just stay in the function I mentioned above. So, could you please show me how to import and update?