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dm8168 doesnot have output on uart2

Hi,

I have a customized dm8168 board and it can be connected with CCS and passed the ti816x_ddr.gel the do_all script and be abled to download and burn the uboot into the nand flash.   the result of CCS shows that the NAND is programmed correctly.   But I can't get any output from uart2,  but the DDR3 clock is working and the RSTOUT of 8168 is high. 

anything else I should look at on the hardware side,

Thanks,

JI Kai