Done it! I've managed to boot my RPi4 with Ubuntu Jammy off an NFSv4 share using the workaround from https://bugs.debian.org/cgi- bin/bugreport.cgi?bug=409272#14 .
I created the file in the attachment and compiled it with klcc. If anyone else wants to use it they'll have to edit the file, put their own share address in, and recompile. I then copied the file to /usr/lib/klibc/bin/nfsmount, replacing the version installed with Ubuntu. After that I ran update-initramfs -u (ignoring the errors - update- initramfs seems blissfully unaware of network booting with NFS of any flavour). After ensuring that /boot/initrd.img did in fact contain my version of nfsmount (lsinitramfs -l /boot/initrd.img) I rebooted the RPi. It came up so cleanly that I thought I must have made a mistake :-) But df -hT showed that the root was mounted with NFSv4. Now for the next problem... :-) ** Attachment added: "a replacement for /usr/lib/klibc/bin/nfsmount to enable NFS booting from NFSv4 share hardwired in file" https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/1954716/+attachment/5608460/+files/nfsmount.c -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to klibc in Ubuntu. https://bugs.launchpad.net/bugs/1954716 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 ``` To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/klibc/+bug/1954716/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
