linux-kernel - Re: [PATCH v4 4/5] arm: Add [U]EFI runtime services support

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Message-ID: <CAF7UmSwGgQ9u505s3fhd5MmGLHHy1A=rJLZBshycKr+rTniH1A@mail.gmail.com>
Date:	Tue, 14 Jan 2014 15:25:23 +0000
From:	Leif Lindholm <leif.lindholm@...aro.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	"linux-efi@...r.kernel.org" <linux-efi@...r.kernel.org>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	Patch Tracking <patches@...aro.org>,
	Will Deacon <will.deacon@....com>,
	Roy Franz <roy.franz@...aro.org>,
	"Fleming, Matt" <matt.fleming@...el.com>,
	Mark Salter <msalter@...hat.com>
Subject: Re: [PATCH v4 4/5] arm: Add [U]EFI runtime services support

On 14 January 2014 13:26, Arnd Bergmann <arnd@...db.de> wrote:
>> > > Are you suggesting that I should #ifndef ARM in common code, or that I
>> > > should neglect to document what the common code will do with data it is
>> > > given by UEFI?
>> >
>> > It would probably be good to document the fact that it won't work,
>> > possibly even having a BUG_ON statement in the code for this case.
>>
>> Why?
>>
>> You'll only touch that pointer if you enable CONFIG_ACPI, and if you
>> do you probably want that address. Sounds a bit hostile to throw a BUG
>> in the face of someone who's (for example) just succeeded to get Linux
>> running on a Windows RT device.
>
> But we know that it can't work unless a lot of other things get changed
> in the kernel.

We know using ACPI cannot work without updates to the kernel.
That doesn't mean we need to throw a BUG just because the
firmware tells us a table exists.

>> Although no other architectures supported by UEFI support big-endian,
>> so to be honest, I don't want to have to be the first one to validate
>> that in order to get the basic support into the kernel.
>
> I think there was a project to run UEFI on PowerPC on some stage, though
> I can't find any code now.

That does sound familiar, but there is nothing in the specification.

/
    Leif
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