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Hi,
we are experiencing exactly the same behaviour.
Have you found a solution/the cause of the error?
In our case, we suspect some possibly badly soldered pins of the FPGA to be part of the problem.
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Yes I did solve this problem. What happened with me was that the DNU pin on the FPGA was accidentally soldered to GND. This essentially killed the chip and produced the above symptoms. I had the FPGA removed, cleaned up, re-balled, and had the pad for the DNU pin isolated. Once that was done I had the FPGA put back on. After that procedure the FPGA came up normally and all the startup signals behaved as they should.
Not exactly an easy fix, but it did solve my problem. Hope this helps.
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