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DM8168 kernel hang problem

Our custom board are under test..

After fusing u-boot, kernel and jffs2 filesystem, we boot the dm8168 custom board.

But, during kernel booting, the kernel randomly hangs(or dies). I don't know why this kernel death occurs.

In my opinion, it seems that DDR3 is the cause of the kernel random death.

There is nothing to modify DDR3 in the kernel. I have to modify u-boot DDR3 setting.

I don't know how to debug u-boot and the kernel.

Do  you have any experience such as RANDOM kernel death?