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Since you failed to get the systemID and timestamp, a quite simple thing to complete, there is something wrong with the cpu and memory system. I just figure out the same problem as you have. Here is my experience for reference.
I checked my design carefully and found nothing doubtful, so I wondered why the cpu didn't respond to the PC. Oh, I forgot the reset signal and it was asserted forever by a switch. I flipped the switch and every thing worked.
So, figure out why your cpu doesn't respond the systemID inquiry, then you can advance to the next step.
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yeah,I encountered this problem two weeks ago, today I figure it out , there is sth wrong with my reset setting, I FORGOT to assert a right reset button
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