Hello Eben,
First, welcome to the 32 bits world!!!
You can fin all you need on Freescale web site, but I suggest you some link like :
- The MCF5225x Reference Manual
- The Data Sheet
For The MQX RTOS, you can find documentation in "C:\Program Files\Freescale\Freescale MQX 3.1\doc" folder.
Useful informations about CodeWarrior are here : "C:\Program Files\Freescale\CodeWarrior for ColdFire V7.1\Help\PDF"
I recommend MSL_C_Reference.pdf, Targeting_ColdFire.pdf, and the excellent ColdFire_Build_Tools_Reference.pdf (especially chapter 19 about runtime libraries)
Emmanuel