dm365 suspend to sram

Because dm368 use ram when enter in deep sleep mode ,so I map the ram 32KB in linux2.6.18(the lsp source code from dm368ipnc )   like 

 {

		.virtual    = SRAM_VIRT,       
		.pfn        = __phys_to_pfn(0x00010000),  //dm368 ram start phy address is 0x10000
		.length     = SZ_32K,
		.type       = MT_MEMORY
},
But in linux2.6.18 It can't map because the ram  phy address does not alignment to 1M ,So i change
the type to MT_DEVICE

I write a  test function , I copy the function from sdram  to ram ,then i run the test function 
in ram ,

It can't be exeute successful, then a pointer error happened!

Could you give me some advise ,thanks a lot!