EFI force boot screen

[dvescovi]

Is it possible to force the boot loader to break into the EFI boot menu on power up?

[rpdom]

Is it possible to force the boot loader to break into the EFI boot menu on power up?

No. There is no EFI on the Pi.

[fruitoftheloom]

Is it possible to force the boot loader to break into the EFI boot menu on power up?

https://en.wikipedia.org/wiki/EFI_system_partition

This is how the Raspberry Pi Boots (the 3B has additional options but basics the same), completely different to a x86 PC with UEFI BIOS:

http://wiki.beyondlogic.org/index.php?t ... ot_Process

[dvescovi]

This is for Windows 10 core on Pi. It uses EFI boot.

[rpdom]

This is for Windows 10 core on Pi. It uses EFI boot.

Are you sure? Because the Pi does not have EFI. If it boots that way (which I doubt), it must load in an equivalent of a BIOS from the SD card.

Try posting in the Windows 10 IoT forum, or asking Microsoft?

[fruitoftheloom]

This is for Windows 10 core on Pi. It uses EFI boot.

Yes you are right, the typical boot process for Windows 10 IoT Core looks like this:

The device powers on and runs the SoC firmware bootloader.

The bootloader launches the UEFI environment and UEFI applications.

The UEFI environment launches the Boot Manager, which can be found in
C:.\EFIESP\EFI\Microsoft\boot\bootmgfw.efi

The Boot Manager launches the Windows Boot Loader, which can be found in
C:\Windows\System32\Boot\winload.efi

The Windows Boot Loader launches the main OS.

You will likely need to ask on the MS Forum:

https://social.msdn.microsoft.com/forum ... WindowsIoT

[sortaloc]

Is it possible to force the boot loader to break into the EFI boot menu on power up?

What about change the bcd file? Have you try yet?