Flashing for NFS as root and Flashing from NFS features both requires booting into root file system hosted on NFS. Sometime due to the speed of network and the PC that NFS is hosted on, one might see that booting into NFS appears to get stuck for a long time while bringing up OEM-Config.
As a work around one can disable OEM-Config and create a default user which will make the boot to NFS file system by-pass the OEM-Config step.
One can follow the instructions at section Configuring NFS Root on Linux Host to configure the NFS server but add below step to disable OEM-Config after creating the root file system but before copying the root file system to NFS (refer to Setting Up the Root File System instruction on creating a root file system )
Step to disable OEM-Config and create a default username and password:
Step 1: Download and untar the attached file inside Linux_for_Tegra
l4t_create_default_user.tar.gz (2.5 KB)
Step 2: ./l4t_create_default_user.sh -u ubuntu -p ubuntu
After executing above steps, you can copy the root file system to your NFS.
If you are flashing form NFS, you can then follow the steps https://docs.nvidia.com/jetson/l4t/#page/Tegra%20Linux%20Driver%20Package%20Development%20Guide/flashing.html#wwpID0E0XG0HA