About shared memory acess issue on DSP on DM6446

On ARM side , I use function:"Memory_contigAlloc" to allocate a input shared memory

This shared memory has three types of section I want to access, one uses 8-bit memory access,one uses 16-bit memory access,

one uses 32-bit memory access.

How do I code my program on DSP??  Anyone can give me some suggestions??

Thanks All