Hi KJ,
The MCF52235 doesn't have enough resources to run uCLinux, so you need to consider other options.
I checked the Freescale website and only found the 5282 MAC, as you mentioned. I would recommend using the SMAC, if possible, because you get the source code, which puts you in a strong position for debugging and enhancing the driver. You might also try using the MC1320x 802.15.4 transceivers for your project.
Thanks,
Rick