The Disappearance of EFI vars

default.ipxe

#!ipxe

# Simplified to minimal case

dhcp || goto err_dhcp

:local
echo "IPXE01@${net0/mac:hexraw} EXIT"
exit

:err_dhcp
echo "IPXE01@${net0/mac:hexraw} DHCP Failure"
sleep 5
goto local

Ingredients

Ingredients
- Plain Ubuntu 14.04.2 install, UEFI mode 
- HW involved - low power Atom and NUC Haswell boxen
- ipxe.efi
- Firmware configured to first boot from UEFI netboot, then from grub.efi
BootCurrent: 0000
Timeout: 1 seconds
BootOrder: 0003,0004,0000,0002
Boot0000* ubuntu        HD(1,800,100000,a22ec259-773f-4a2c-9dd2-b7c5d980993e)File(\EFI\ubuntu\shimx64.efi)
Boot0002  ubuntu        HD(1,800,100000,a22ec259-773f-4a2c-9dd2-b7c5d980993e)File(\EFI\Ubuntu\grubx64.efi)
Boot0003* UEFI: IPV4 Realtek PCIe GBE Family Controller ACPI(a0341d0,0)PCI(1c,2)PCI(0,0)MAC(f07959de54bb,0)IPv4(0.0.0.0:0<->0.0.0.0:0,0, 0..BO
Boot0004* UEFI: IPV6 Realtek PCIe GBE Family Controller ACPI(a0341d0,0)PCI(1c,2)PCI(0,0)MAC(f07959de54bb,0)030d3c000000000000000000000000000000000000000000000000000000000000000000000000000000004000000000000000000000000000000000..BO
Should:
- Load normally
- `sudo efibootmgr -v` should list BootNNNN variables

Result:
- System loads
- There are no BootNNNN variables and in general the available set is small:


* Should boot properly from local disk