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Meaning of PCIe RC reg RESR error Multiple ERR_COR Received

Question asked by Tyler Sheffield on Apr 21, 2016
Latest reply on Apr 21, 2016 by igorpadykov

iMX6SDL, single core

In the RC mode register RESR at 1FF_C130h I'm seeing a multiple ERR_COR Received being reported, but what does that mean and how can I trouble shoot?  This error does not appear with the same HW running the working Linux pcie driver (and endpoint).  The PL DEBUG1 register shows xmlh_training_rst_n LTSSM-negotiated link reset is set, continually.