Hi,
The micros from PowerPC MPC57xx portfolio are very different.
Each one is aimed to different segment like safety, engine control,body, etc.
And every micro of MPC57xx have different FES/DES register content and reset mechanisms.
I do not expect you are going to me project on all of them. Some of them are not even for mass market.
First choose micro which you will use and then we can continue.
Peter