Big Endian to little endian

Unfortunately I do not know of such a library, though often the code generation tools (i.e. the C compiler) will have a switch to go between little and big endian, at least this is the case for our DSPs, so depending on how architecture specific their code is for the Freescale device it may not be that difficult to port, chances are that if they had a lot of endian dependent code that it was architecture specific anyway and would require porting effort regardless.

Generally endianess is more of a problem for cross platform communication, i.e. two devices that share data must agree on endianess, as opposed to a problem for the processor itself, so I am not sure what exactly the endianess conflicts are for your customer's particular situation.