How to use GPIO05_PP5 in xavier AGX

hi, we designed xarier AGX bottom board, now I should use GPIO05_PP5 pin to detect external voltage signal, but there is some trouble while I get the number for GPIO05_PP5.

I get some step from internet about how I can use GPIO :

  1. cd /sys/class/gpio
  2. export 491 > export
  3. echo in > direction
  4. cat value

But I don’t know the num for GPIO04_PP4, and so do for GPIO05_PP5, GPIO06_PP6.