Jetson Xavier AGX Devkit C5 Fails to Enable Sometimes: "Phys Link Never Came Up"

Robotics & Edge Computing Jetson Systems Jetson AGX Xavier
1

Hello,

I am using a PCAN-miniPCIe FD connected to this adapter connected to the C5 PCIe slot on the devkit.

Attached are the two dmesg files between a working boot and a non-working boot. The first difference seems to be “Phys link never came up.”

correct.txt (4.2 KB)
incorrect.txt (3.5 KB)

image
image1435×738 278 KB

Do I somehow need to give the PCAN system more time to initialize? I believe it has a FPGA on it.

3

Hi,

Please try to unbind and bind the pcie controller after system boots up for a while and see if you can see it got detected.

4

Thank you, I will try this: C4 and C5 says "Phy link never came up" - #8 by WayneWWW

5

The following worked:

cd /sys/bus/platform/drivers/tegra194-pcie
echo 141a0000.pcie > unbind
echo 141a0000.pcie > bind

Is there any way I can automate this? The system I am designing needs to be reliable on boot. I can imagine making a systemd script but I am wondering if there is a better way.

6

Any ideas?

7

Hi,

I think you can write a script and execute it in every boot. Most possible case is there were some requirements not meet in the boot stage and causes detection not work. But later it is okay.