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NETRA DDR3 read/write problem

Hi,

We made two boards based on DM8168, one board is ok with DDR3 and be able to load the u-boot and load the linux, but another one board has failture in the DDR3 loading, after check the content of DDR3, I found the DDR3 associated with EMIF0 has random error always on the bit29, (32 bit data bus wide), but the DDR3 associated with EMIF1 is doing correct. 

one board is good, another board has some problems,

do you have some advices on how to debug this DDR3 issue.

Thanks,

Karl