U-boot nfs boot

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U-Boot's NFS support can be used to load a kernel, device tree binary, and root filesystem. The default scripts include an example NFS boot script. 

# Set this to your NFS server ip
env set serverip 192.168.0.11;

# Set this to your NFS root path.  The server root should be accessible at this path.
env set nfsroot /path/to/nfs/rootfs/
env save

To boot your NFS root: 

# Boot to NFS once
run nfsboot;

# To make the NFS boot the persistent default
env set bootcmd run nfsboot;
env save
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