Hi,
if you are looking for SDK for MPC5644A, please notice that SDK is not available for MPC56xx family.
Some bare-board examples can be found in this application note:
https://www.nxp.com/docs/en/application-note/AN2865.pdf
MPC5500 and MPC5600 Simple Cookbook Code
or here:
https://community.nxp.com/docs/DOC-329623
Regards,
Lukas