[U-Boot] NAND write issue is DM355

Hi all,

I am porting u-boot to TI DM355 based board.

When I write to nand using nand write command upto offset of 0x60000 it is working fine. but If I write above 0x70000 it is writing to 0x0 address. Can some one give me suggestion how to correct this issue.

NAND size 64M