linux-kernel - Re: [PATCH v3 1/3] Documentation: arm: add UEFI support documentation

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Message-Id: <20131205110848.A9385C40710@trevor.secretlab.ca>
Date:	Thu, 05 Dec 2013 11:08:48 +0000
From:	Grant Likely <grant.likely@...aro.org>
To:	Matt Sealey <neko@...uhatsu.net>,
	Leif Lindholm <leif.lindholm@...aro.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, linux-efi@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>, matt.fleming@...el.com,
	Roy Franz <roy.franz@...aro.org>,
	Mark Salter <msalter@...hat.com>,
	Patch Tracking <patches@...aro.org>,
	linaro-uefi@...ts.linaro.org, Mark Rutland <mark.rutland@....com>,
	Rob Landley <rob@...dley.net>, linux-doc@...r.kernel.org
Subject: Re: [PATCH v3 1/3] Documentation: arm: add UEFI support documentation

On Wed, 4 Dec 2013 15:06:47 -0600, Matt Sealey <neko@...uhatsu.net> wrote:
> If your platform has UEFI, then your platform has UEFI - if you built
> a multiplatform kernel that needs to boot on U-Boot, then you glued an
> EFI stub to it to make it boot. At some point between the stub and the
> runtime services driver, you're going through 10,000 lines of code
> with the information that it *is* running on top of UEFI completely
> lost to the boot process.
> 
> I believe I am also objecting to the idea that the way this is BEST
> implemented is to take a stock zImage (decompressor+Image payload) and
> glue a stub in front to resolve the interface issue when the
> implication is extra complication to the boot process.

Adding UEFI support to an existing image type was a design goal when we
started. Having yet another image format which is not compatibile with
existing firmware adds yet another barrier to migrating from U-Boot to
UEFI, or to supporting multiplatforms.

g.
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