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Date:	Mon, 1 Sep 2014 19:42:08 +0100
From:	Matt Fleming <>
To:	Calvin Walton <>
Cc:	Yinghai Lu <>,
	Matt Fleming <>,
	"H. Peter Anvin" <>,
	Thomas Gleixner <>,
	Ingo Molnar <>,,,
	"" <>
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:
> I've bisected the change, and it has led me to:
> 4bf7111f50167133a71c23530ca852a41355e739 is the first bad commit
> commit 4bf7111f50167133a71c23530ca852a41355e739
> Author: Yinghai Lu <>
> 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 <>
>     Signed-off-by: Matt Fleming <>
> 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?

Matt Fleming, Intel Open Source Technology Center
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