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Date:	Mon, 1 Sep 2014 19:42:08 +0100
From:	Matt Fleming <matt@...sole-pimps.org>
To:	Calvin Walton <calvin.walton@...stin.ca>
Cc:	Yinghai Lu <yinghai@...nel.org>,
	Matt Fleming <matt.fleming@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, x86@...nel.org,
	linux-efi@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [bisected, regression] 3.17-rc2 kernel doesn't load initramfs
 with EFI stub boot

On Wed, 27 Aug, at 12:02:37PM, Calvin Walton wrote:
> Hi all,
> 
> When I tried booting the 3.17-rc2 kernel on my Lenovo ThinkPad T440p 
> (16gb ram) via Gummiboot/EFI stub, it failed with an error saying that 
> it could not mount root. A little investigation revealed that the 
> initramfs did not load, so mounting by filesystem UUID failed.
> 
> A video of the failed boot is available here, if you're curious:
> https://www.youtube.com/watch?v=wOHTvg8Tico
> 
> I've bisected the change, and it has led me to:
> 
> 4bf7111f50167133a71c23530ca852a41355e739 is the first bad commit
> commit 4bf7111f50167133a71c23530ca852a41355e739
> Author: Yinghai Lu <yinghai@...nel.org>
> Date:   Sat Jun 14 12:23:41 2014 -0700
> 
>     x86/efi: Support initrd loaded above 4G
> 
>     For boot efi kernel directly without bootloader.
>     If the kernel support XLF_CAN_BE_LOADED_ABOVE_4G, we should
>     not limit initrd under hdr->initrd_add_max.
> 
>     Signed-off-by: Yinghai Lu <yinghai@...nel.org>
>     Signed-off-by: Matt Fleming <matt.fleming@...el.com>
> 
> This commit reverts cleanly on top of 3.17-rc2, and the resulting 
> kernel boots correctly.

Thanks for reporting this. Could you try the below commit and see
whether it fixes things for you?

  http://article.gmane.org/gmane.linux.kernel.efi/4524

-- 
Matt Fleming, Intel Open Source Technology Center
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