TFTP grubnetx64.efi doesn't read the grub.cfg

Hello

This is not the normal use case for LTSP

I have downloaded a grub binary
http://archive.ubuntu.com/ubuntu/dists/bionic/main/uefi/grub2-amd64/current/grubnetx64.efi.signed

The file is saved on ltsp TFTP root to
/var/lib/tftpboot/ltsp/i386/grubnetx64.efi

and network booting this on UEFI only enabled machine

The machine finds the right boot filename from dhcp (dnsmasq) tftp://
192.168.67.1/ltsp/i386/ipxe.fi which is configured chainloading to the
target boot filename tftp://192.168.67.1/ltsp/i386/grubnetx64.efi

problems prevent the grub reading configuration grub/grub.cfg
--> grub doesn't get the config  tftp://192.168.67.1/ltsp/i386/grub.cfg

/var/lib/tftpboot/ltsp/i386/snponly.efi
/var/lib/tftpboot/ltsp/i386/ipxe.efi
/var/lib/tftpboot/ltsp/i386/grubnetx64.efi


I don't know if this grub.cfg need some more writing...
/var/lib/tftpboot/ltsp/i386/grub/grub.cfg is this:
menuentry "LTSP" --class os {
     echo "Loading Linux..."
     linux vmlinuz ro init=/sbin/init-ltsp quiet splash root=/dev/nbd0
     echo "Loading initial ramdisk..."
     initrd initrd.img
}

I have now tried to if the problem is in the network boot or TFTP.  So I
nstalled a virtualbox 64-bit quest with uefi firmware enabled. This guest
is installed with rawdisk vmdk image mapped to USB storage. The ipxe.efi
(x84-64_EFI) image is installed to the USB storage.

the virtualbox 64-bit guest boots  successfully uefi firmware and ipxe but
chainloading to the TFTP served grub it doesn't read or request from TFTP
the grub.cfg. I interrupt the boot to prompt > enter 'dhcp' > check the
right dhcp information and next-server -> chainloading TFTP  grubnet64.efi
works but the problem is still that grub doesn't read grub/grub.cfg  from
the TFTP. I have tested this also chainloading from ipxe first to  TFTP
ipxe.efi (also built snponly.efi) but grub.cfg reading doesn't get any
better results:

Mar 12 21:02:01 ltsp-server dnsmasq-dhcp[1548]: DHCPDISCOVER(eth1)
08:00:27:50:eb:e3
Mar 12 21:02:01 ltsp-server dnsmasq-dhcp[1548]: DHCPOFFER(eth1)
192.168.67.113 08:00:27:50:eb:e3
Mar 12 21:02:01 ltsp-server dnsmasq-dhcp[1548]: DHCPREQUEST(eth1)
192.168.67.113 08:00:27:50:eb:e3
Mar 12 21:02:01 ltsp-server dnsmasq-dhcp[1548]: DHCPACK(eth1)
192.168.67.113 08:00:27:50:eb:e3
Mar 12 21:02:39 ltsp-server dnsmasq-tftp[1548]: sent
/var/lib/tftpboot/ltsp/i386/ipxe.efi to 192.168.67.113
Mar 12 21:02:45 ltsp-server dnsmasq-dhcp[1548]: DHCPDISCOVER(eth1)
08:00:27:50:eb:e3
Mar 12 21:02:45 ltsp-server dnsmasq-dhcp[1548]: DHCPOFFER(eth1)
192.168.67.113 08:00:27:50:eb:e3
Mar 12 21:02:45 ltsp-server dnsmasq-dhcp[1548]: DHCPREQUEST(eth1)
192.168.67.113 08:00:27:50:eb:e3
Mar 12 21:02:45 ltsp-server dnsmasq-dhcp[1548]: DHCPACK(eth1)
192.168.67.113 08:00:27:50:eb:e3
Mar 12 21:02:46 ltsp-server dnsmasq-tftp[1548]: sent
/var/lib/tftpboot/ltsp/i386/grubnetx64.efi to 192.168.67.
113

same with wireshark:

8 37.879095769 192.168.67.113 192.168.67.1 TFTP 92 Read Request, File:
ltsp/i386/ipxe.efi, Transfer type: octet, blksize=1432, tsize=0
1350 44.367916403 192.168.67.113 192.168.67.1 TFTP 99 Read Request, File:
/ltsp/i386/grubnetx64.efi, Transfer type: octet, blksize=1432, tsize=0

Is there some problem with my grub version (link on top) or is there some
guideline grub.cfg location I need to use for grubnetx64 ?

How should I setup the TFTP  if serving grub for LTSP client network ((BIOS
or UEFI)?

Best regards
Valtteri

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