Hello, I am using MPC5644. I'd like to ask that for a unique MCU(e.g. MPC5644) is there any guide or instruction from the manufacture that describing how we should designed the start up code? Such as the initialization sequence and how to use the assembly instructions? Currently I looked for reference mostly on the MCU user manual and the core manual. Where can I find the guide to help to make a start up code and then a bootloader? Thank you very much!