Got it, are there any hardware folks you can tag who may be able to help with bringing up an Xavier NX M.2<–> AGX Orin PCIe connection? Or, should I make a separate post?
Here are the additional debug steps I’ve tried:
- Replacing the Xavier NX RP with a different machine that has an M.2 slot (still did not detect AGX Orin EP). Sadly I do not a second x16 device to test with.
- Tracing connectivity between the M.2 side’s pins and AGX Orin’s PCIe pins (i.e. crossover is correct)
- Re-checking custom kernel, ODMData, flash steps - all are fine.
- different methods of powering the PCIe slot M.2 to x16 adapter (bench 12v supply vs wall adapter - I was concerned the slot was being powered incorrectly, but it has no effect .)
- Re-enumerating the PCIe bus using
echo 1 > /sys/bus/pci/rescanand changing the RP / EP boot order - no effect.
Our team has triple-checked that our custom PCIe crossover board’s buffers are getting power correctly, and it was built with NVIDIA’s design guidelines for PCIe, so quite confident that part is right especially after probing pins.
My thinking: could Orin AGX EP require some special kernel config / patch for x4 that i’m unaware of, since M.2 (RP) supports only upto x4 while the physical AGX slot is x16?