Hi,
You can either use Rappid bootloader:
Overview of RAppID Bootloader|NXP
Or port it from MPC5748G which is described in:
https://cache.nxp.com/docs/en/application-note/AN5319.pdf?fsrch=1&sr=1&pageNum=1
+ software:
https://cache.nxp.com/docs/en/application-note-software/AN5319SW.zip
Peter
HI , peter , thank for you support , i am try to write the bootloader of mpc5744 ,I'm very lucky to see the demo what you give .but the demo you give is mpc5748G, the IDE you use is Green Hills MULTI IDE , My IDE is S32 Design Studio for Power Architecture , What should I pay attention to during the transplant? thank you.