Altera PCIe not detected due to UEFI0067 Error at boot time

Hello

We are using Altera Arria V GX 5AGXMA7D4F27I3 in a PCIe board developed in house, we have occasionally been experiencing the PCIe board not being detected by the host (Windows); this problem is occasional, so we do not see it all the time and not all all machines. When we have this problem Windows shows the following message when booting up:

"UEFI0067: A PCIe link training failure is observed in PCIe Slot 2 and device link is disabled.

A PCIe link failure is observed in the PCIe device identified in the message and device link is disabled.

Recommended Response Action

Do one of the following: 1) Turn off the input power to the system and turn on again. 2) Update the PCIe device firmware. If the issue persists, contact your service provider."

Altera suggested a work-around by using a soft reset controller in the PCIe IP (https://www.altera.com/support/support-resources/knowledge-base/solutions/rd11192013_905.html), however, we tried this and did not fix the problem.

PS: When we see this problem, the logic inside the board seems to be working as the board LEDs are blinking, so the FPGA logic and clocks are functioning.

Cheers,

Chafik