PCIe is not detected, however after several reboots, it is

Hi,

I’m developing a project with Jetson AGX Xavier DVK. Jetson serves as the PCIe root complex, and I have an Intel Arria10 FPGA-based customized card for our project, which serves as the end point. I took PCIe x4 from the M.2 Key M slot and PCIe x8 from the Jetson AGX Xavier’s X16 connector.

I’m not using any root complex power(3.3V,12V). I turned on the Jetson first, then our Arria10 board. At that time, the PCIe is not detecting. The PCie detects after a few restarts of the Jetson. I don’t restart the Arria10 board.

Not sure what could be the reason, Pl let me know if you have any idea.