What U-Boot command and syntax are used to configure the network root filesystem directory for G51M SOM module?

Please set the nfsroot environment variable in U-Boot as shown below:
IWG51M # setenv nfsroot

Example:
IWG51M # setenv nfsroot /var/lib/tftpboot/rootfs/

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Agilex™ 7 R24C SoC FPGA System on Module