RE: Windows on ARM machines : UEFI bugs

[Longhorn]

The call to ExitBootServices as done by Grub returns EFI_INVALID_PARAMETER from 
the firmware.

-----Message d'origine-----
De : Grub-devel [mailto:address@hidden De la part de Andrei Borzenkov
Envoyé : mardi 23 août 2016 13:11
À : The development of GNU GRUB <address@hidden>
Objet : Re: Windows on ARM machines : UEFI bugs

On Tue, Aug 23, 2016 at 1:24 PM, my123 (@never_released) <address@hidden> wrote:
>
> It returns EFI_INVALID_PARAMETER and refuses to work here.

What is "it"? What exactly are you doing?

> (I didn't try to reverse engineer how Windows does it, yet) -----Mesej 
> Asli-----
> Daripada: Grub-devel 
> [mailto:address@hidden Bagi Pihak Andrei 
> Borzenkov
> Hantar: mardi 23 août 2016 12:09
> Kepada: The development of GNU GRUB <address@hidden>
> Subjek: Re: Windows on ARM machines : UEFI bugs
>
> On Tue, Aug 23, 2016 at 12:39 PM, my123 (@never_released) <address@hidden> 
> wrote:
>> Note that on the Surface RT, the first GOP handle is unusable, th 
>> search for handles has to start at handle 1. This bug doesn’t affect 
>> other WoA devices.
>>
>
> Well, someone who has access to such devices needs to find out how to detect 
> this condition.
>
>>
>>
>> On WoA(Windows on ARM) machines, ExitBootServices doesn’t work, 
>> especially on nVidia devices. What action should be taken?
>>
>
> Not sure I understand what you say. Could you elaborate on what you are 
> trying to do and what does not work? For booting Windows loader is launched 
> as EFI executable so no ExitBootServices happens.
>
>>
>>
>> (this is a part of the port of Linux to these machines, after 
>> neutralizing Secure Boot)
>>
>
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