It's not an incompatible file system. NFS operates on a much higher level than a file system driver.
This is an NFS server config issue, and as you said raspberry pi I'm going to assume that you're running some variety of Linux on that server. This is just my own personal anecdote/experience, but Linux NFS doesn't play as nice with IRIX as does BSD or Solaris/illumos based NFS. I run NetBSD on my RPis and it just works out of the box with simple configs.
That being said you're going to need to pick over the configuration and maintain a meticulous eye.
Start with the basics:
Make sure your server is only serving NFSv3 and/or 2. RPCBIND and MOUNTD both need to be running properly and configured under version 3 mode which varies between Linux versions. Make sure that your server and your O2 are assigned to the same subnet. Make sure that you're using the correct flags to share, and that user IDs and permissions are set up correctly
I'm the system admin of this site. Private security technician, licensed locksmith, hack of a c developer and vintage computer enthusiast.
https://contrib.irixnet.org/raion/ -- contributions and pieces that I'm working on currently.
https://codeberg.org/SolusRaion -- Code repos I control
Technical problems should be sent my way.
