I do not know if the ACLs are needed. I've uploaded a tar ball of a
generic nfsroot (stretch, FAI 5.1.2, kernel 4.6) to
http://fai-project.org/download/misc/nfsroot-generic_5.1.2_4.6.tar.xz
It was created by fai-make-nfsroot -fvg

You can extract it on your FAI server and adjust it by calling
fai-make-nfsroot -av
See the man page for details. Then copy the kernel and initrd from
the nfsroot to your tftp location. This nfsroot work perfectly in my
network. Please report if this also works for you.

best regards thomas

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