Re: Windows on ARM machines : UEFI bugs

[Andrei Borzenkov]

On Tue, Aug 23, 2016 at 2:18 PM, Longhorn <address@hidden> wrote:
> The call to ExitBootServices as done by Grub returns EFI_INVALID_PARAMETER 
> from the firmware.
>

grub has many different loaders. What exactly are you doing?

> -----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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