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Linux/AM3352: Boot issue

Part Number: AM3352


Tool/software: Linux

my AM3352 board cannot start  and always print CCCCC  although the MLO and uboot is ok,but when I mv the MLO and uboot to another place and cp MLO Uboot  back,and it start ok.who knows why?

As the title says,I test my product which using am3352,my test is just ramdom Cut off the power automatic.but after a month,my board just print “CCCCC”. I use the sd card to start the board,and I mv MLO and uboot to another place,then ,I cp the uboot MLO to  /dev/mmcblk0p1  back ,it start ok。but ,when I mv the original bad MLO and uboot to   /dev/mmcblk0p1,it turns bad again.  I don`t know how to solve this problem, can anyone tell me the possible reason for this problem? thanks!!