If you are MCD 4.0 or above you can just go to the About screen and it will show you the controller type on the bottom.
There is also a way to do it from the RTC:
How to identify 3300 platform types from RTC:
at RTC shell, type sysGetPlatformFamily
Determine the platform types as follows:
For CX = 64
For MX = 200
For Lite = 250
For AX = 300
For LX = 1000
For MXe = 2000
Example Code:
-> sysGetPlatformFamily
sysGetPlatformFamily
value = 250 = 0xfa
->