Re: UEFI GRUB boot menu disappears after booting into Windows 8

[Chris Murphy]

On Jan 13, 2013, at 7:29 PM, Andrey Borzenkov <address@hidden> wrote:

> В Sun, 13 Jan 2013 16:45:15 -0700
> Chris Murphy <address@hidden> пишет:
> 
>> 
>> On Jan 13, 2013, at 4:38 PM, Joan Jerez <address@hidden> wrote:
>> 
>>> Hello again,
>>> 
>>>> GRUB appears, shows you what, before disappearing and booting Windows? Can 
>>>> you interrupt this by pressing ESC or SHIFT (some versions apparently stop 
>>>> on GRUB with shift, others esc).
>>> Don't know what is happening but laptop boot directly to Windows (only 
>>> appears manufacturer splash screen and then manufacturer splash screen 
>>> loading Windows), bypassing GRUB,
>> 
>> This suggests to me that the /EFI/BOOT/bootx64efi is a Windows boot loader. 
>> When that file is present, it is always used. 
> 
> No, it is not. It is default path that is used if EFI boot menu entry
> does not include file and points only to device. So if menu entry says
> just HDD0 - it will load bootx64.efi, but if it menu entry says
> HDD0\EFI\openSUSE\grub.efi - it will load exactly this path.

I think this depends on the firmware. It's definitely not how it works on Apple 
EFI firmware. If there is a bootx64.efi file in /EFI/BOOT, that file is always 
used no matter what is set in the HFS+ header, no matter what is set in 
firmware NVRAM.

Chris Murphy