Re: [PATCH] Remove warning in efi_enter_virtual_mode

[H. Peter Anvin]

On 04/18/2013 01:11 PM, Darren Hart wrote:
>>
>> I would expect that if there are any 32-bit UEFI systems that ship with
>> BGRT support (and Darren makes it sound like that's a possibility),
>> there's a realistic chance of the BGRT ending up allocated above the
>> highmem barrier.
> 
> I can certainly ensure we sit below that barrier on the MinnowBoard. We
> can also speak with the Intel UEFI firmware development teams to see
> about making that a requirement. I don't know if we'll be successful,
> but Matt, Peter, and I have recently coaxed some changes of that nature in.
> 

No, that is the wrong approach.  The HIGHMEM barrier is a Linux kernel
construct and isn't even guaranteed to be the same from one boot *of the
same kernel* to another.  The value 896M is merely the default, but it
can be affected by both compile time and command line options.

	-hpa

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