Hi,
I have in some board the LS1012 UART Communication does not occur. These are just a few boards.
But still wondering what could be the problem?
Doublecheck the design referring the QorIQ LS1012A Data Sheet and Design Checklist document.
Using a digital scope ensure that POR levels of all signals corresponds with the requirements of the notes in the Table 1. Pinout list by bus of the LS1012A Data Sheet.
Check power-on supplies ramp rate, reset signals timings and input clocks behaviour.