Windows 10 UEFI boot via bootx64.efi

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hupostasis
Posts: 383
Joined: 14 Sep 2015, 13:11

Windows 10 UEFI boot via bootx64.efi

Post: #2714 hupostasis
26 Jun 2016, 21:27

On systems that support UEFI and GPT, Windows 10 configures its bootloader in an EFI system partition (ESP). Therefore, just configuring your UEFI to 'boot' from say, Hard disk 0, nothing will actually be loaded.

The disk where you have Windows 10 installed must have a 'boot from EFI file' entry instead pointing to the following:
\EFI\BOOT\BOOTX64.EFI

So in your UEFI boot manager, you'll need to point to that file in the root of the ESP and give it a name, like 'Windows Boot Manager' or something. Windows typically will do this by default, but if for some reason you lose the entry and assume setting the UEFI to boot from disk will work, then you'll in fact get nothing.

Just out of curiosity I also tried the following:
\EFI\MICROSOFT\BOOT\en-US\BOOTMGR.EFI.MUI
Nothing came of it, so it always refers directly to BOOTX64.EFI.