It seems that your board is freezing after DDR initialization and before miniloader boot.
It could be an issue with the DRAM or an issue with flash memory, but since you said you swapped the sdcard and moved to eMMC, probably the problem may somewhere in the DRAM.
I'm more prone to suspect some power issue or interference issues though. I see from your dmesg that you have a faulty USB device attached: USB device could easily cause the board to misbehave, either by direct effect (faulty or shortcircuited USB device) or indirectly (interference coming from external equipment attached to the USB device).
I have seen once a faulty USB stick that was preventing a Raspberry Pi to boot at all; removing the stick allowed the board to boot fine.
