A problem about using long type pointer

I use CCS v5.0 to compile ARM code of OMAPL138 and I find that when I define a long type pointer as "long *plData;" and give it an address that is not the multiple  of 4, the value *plData is wrong.

e.g.:

unsigned char aucData[6]={1,2,3,4,5,6};
unsigned char *pucData = aucData+2;
unsigned long *pulData = (unsigned long *)pucData;
 unsigned long ulData;

ulData = *pulData;

I found the value of ulData was 0x02010403,but the value 0x06050403 was my expectation.

Because there is not the same problem in other compilers such as IAR,VC,I wonder how I can solve it.Thanks!