On 11/05/19 07:15, Andrew Fish via Groups.Io wrote:
> You could also edit any existing variables that point to your Load File to
> make sure they follow the rules you care about?
>
> It is legal from an UEFI spec point of view for a platform to edit the nvram
> boot variables based on platform boot policy.
Good point; for example OVMF and ArmVirtQemu* do this, with the help of
QemuBootOrderLib. In essence:
- connect a particular set of devices ("ConnectDevicesFromQemu")
- if that fails, call EfiBootManagerConnectAll()
- call EfiBootManagerRefreshAllBootOption()
- register UEFI Shell boot option manually
- filter and reorder boot options in a platform specific way
("RemoveStaleFvFileOptions", "SetBootOrderFromQemu")
All this happens in PlatformBootManagerAfterConsole().
Thanks,
Laszlo
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