Puzzle about the malloc and sds_alloc_non_cacheable in example

[lishen565]

Hi all, I made my own app.elf and found that function malloc and sds_alloc_on_cacheable were different in return ptr value's effective digit. For example , the return ptr of malloc was like to be 0x18a73c20, which was 32bit effective digit. But the return ptr of sds_alloc_on_cacheable was like to be 0x7f85084010, which was 40bit effective digit. If I tried to malloc a large mem size , the return ptr of malloc would also to be 40bit effective digit. Could anyone explain this issue? I find that zcu102 has a PS ddr and a PL ddr. Does zcu102 32 bit correspond to PS DDR and 40 bit to pl ddr? Thanks a lot.