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I only see two leads connected in those pictures, you need three.
Connect up the ground lead.
And yes, you should see something on the serial port line.
Even if the kernel never starts, you will see u-boot messages on that port;
And even before that, you will see messages from the SoC's internal start-up code (such as when it starts to run build-in services, which you know has happened).
So yes, you should be seeing something on the serial port line.
Hook up that ground lead and recheck all of your work.
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