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AM3352: NAND boot fails

Part Number: AM3352

Hi Sir 

We have some MBs which have NAND booting failed issue. And it hangs in u-boot stage after using for a while

below log is failed message 

below is ok message

if we use sdcard booting by modifying boot-mode, the system can boot successfully. 

And then we re-program the u-boot image of NAND from sdcard.

below is the nand flash schematic 

Does TI have any suggestion or we miss something for this case?

thanks for the help.

BR

Yimin