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

[Juerg Haefliger]

As mentioned, NFS mounts are handled by nfsmount provided by the klibc-
utils package which currently doesn't support NFSv4:

$ /usr/lib/klibc/bin/nfsmount -o vers=4
/usr/lib/klibc/bin/nfsmount: bad NFS version '4'

Reassigning the bug to klibc-utils.

** No longer affects: linux-raspi (Ubuntu Impish)

** Changed in: linux-raspi (Ubuntu)
       Status: Triaged => Invalid

** Also affects: klibc (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1954716

Title:
  rpi nfsroot vers=4 not supported anymore?

Status in klibc package in Ubuntu:
  New
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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