[Fw_Os_Forum] Disabling persistent boot variable changes from OS

dann frazier dann.frazier at canonical.com
Wed Dec 21 12:01:36 EST 2016

  I'm seeking advice for a use case where I want to be able to
configure systems to PXE boot on every boot in a persistent way. The
PXE server would be used to direct the client to either boot/install
from the network, or chainload the OS bootloader installed on disk.
The problem is that network installs/updates generally install an EFI
boot entry and set it as first in the boot order, overriding the PXE
boot default. I was hoping there was a way to e.g. set the boot
variables as volatile using an EFI application during the PXE
directed-boot process, but it looks like the volatile flag can only be
set when creating new variables. There are obviously ways to prevent
variable updates on a per-OS basis - but I'm hoping to avoid
implementing per-OS solutions here. Thanks!

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