Hi,
Frankly I am not quite sure if the display you mentioned will work with the MCF51MM256, the main reason is the library. We do not provide the library as you concerned. Anyway, we have an application note that explains how to design a low-level TFT-LCD driver for mini-FlexBus or SPI connections with MCF51MM. You may find more guideline on hwo to do http://www.freescale.com/files/microcontrollers/doc/app_note/AN4153.pdf