[Bug 1954716] Re: rpi nfsroot vers=4 not supported anymore?

[Juerg Haefliger]

Please do test the work-around. If indeed NFSv4 solves your overlayfs
problem then that would be another reason for fixing nfsmount.

We can carry Ubuntu specific fixes if for some reason Debian doesn't
want them but the preferred way is obviously to fix it in Debian so that
it tickles down naturally to Ubuntu (and other Debian based distros).

I'm looking at it atm but NFS is not my strong suit :-)

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Title:
  rpi nfsroot vers=4 not supported anymore?

Status in klibc package in Ubuntu:
  Confirmed
Status in linux-raspi package in Ubuntu:
  Invalid

Bug description:
  I'm running `5.13.0-1011-raspi #13-Ubuntu SMP PREEMPT Fri Nov 19
  18:40:23 UTC 2021 aarch64 aarch64 aarch64 GNU/Linux` and have
  successfully set up netbooting on my RPi 4B (4GB). When I do not
  specify a `vers=` in cmdline.txt, NFS version 3 is used. I'd like to
  move to version 4, but unlike the setup described in
  https://forums.raspberrypi.com/viewtopic.php?p=1751741#p1751741, I
  cannot get `vers=4` (or any sub-version to work): the console logs
  `invalid value for vers.` for whatever I try.

  Current working cmdline.txt:
  ```
  dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=/dev/nfs nfsroot=192.168.3.101:/srv/pinet/root,tcp ro ip=dhcp rootwait fixrtc splash
  ```

  Nonworking cmdline.txt:
  ```
  dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=/dev/nfs nfsroot=192.168.3.101:/srv/pinet/root,tcp,vers=4 ro ip=dhcp rootwait fixrtc splash
  ```

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