Maybe grub file bootx64.efi do not have network module. You can try to use
grub provided by Ubuntu
http://archive.ubuntu.com/ubuntu/dists/trusty/main/uefi/grub2-amd64/current/grubnetx64.efi.signed
Or build your own grub that build-in with network capability.
In your root tftp server create a grub folder with grub.cfg.
/tftpboot/grub/grub.cfg
Your grub.cfg should look like this
=============================
Set timeout 5
menuentry "core-image-sato" {
linux image/bzImage
initrd image/initrd
}
==============================
Put your image in tftp root
/tftpboot/image/bzImage
/tftpboot/image/initrd
If you want to put your rootfs in NFS. You need to include network module in
kernel and extract your rootfs for example to /srv/rootfs. Then your grub.cfg
should be like this
===================== grub.cfg ============================================
Set timeout 5
menuentry "core-image-sato-NFS" {
linux image/bzImage root=/dev/nfs rw
nfsroot=192.168.1.1:/srv/rootfs,hard,tcp,intr ip=dhcp
initrd image/initrd
}
========================================================================
Regards,
Alim Hussin
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