this needs some preparations serverside:

mint13 amd64 installation resides in /home/mint13/amd64

needs a patched version of klibc package which doesnt fail on
non-empty initramfs before chrooting into real system

nfs:

/etc/exports:

/home/mint13/amd64 *(ro)

tftp:

bind mount /home/mint13/amd64/boot to /srv/tftp/mint13/amd64/

/srv/tftp/pxelinux.cfg/default: (adapt ip address)

LABEL LinuxMint13-64
        MENU LABEL Linux diskless (Mint 13 64bit, boot-test)
        KERNEL mint13/amd64/vmlinuz
        APPEND initrd=mint13/amd64/initrd.img nfsroot=192.168.1.96:/home/mint13/amd64 boot=nfs root=/dev/nfs ip=dhcp nosplash union=aufs showmount console-setup/layoutcode=de locale=de_AT bootkbd=de caspernfs-autologin=mint
# append "caspernfs-debug" to stop at several stages during initial boot

