linux-kernel - Re: 3.9.7, 3.10-rc7 - UEFI stalls at boot (nothing displayed), when booting with mem=300M

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Date:	Thu, 04 Jul 2013 10:53:47 +0200
From:	Yves-Alexis Perez <corsac@...ian.org>
To:	Luca Barbato <lu_zero@...too.org>
Cc:	Matthew Garrett <mjg59@...f.ucam.org>,
	Matthew Thode <prometheanfire@...too.org>,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	kernel@...too.org, hardened-kernel@...too.org
Subject: Re: 3.9.7, 3.10-rc7 - UEFI stalls at boot (nothing displayed), when
 booting with mem=300M

On jeu., 2013-07-04 at 10:37 +0200, Yves-Alexis Perez wrote:
> On jeu., 2013-07-04 at 07:53 +0200, Luca Barbato wrote:
> > On 07/01/2013 03:07 PM, Luca Barbato wrote:
> > > Hopefully I will carve some time next weekend to play the restricted
> > > bisect game.
> > 
> > Release 3.10 apparently doesn't show the problem, I guess problem solved
> > for me =)
> > 
> > lu
> > 
> I've just tried 3.10.0 with CONFIG_EFI=y and I still can't boot with
> mem=300M.
And to be a little more specific, and with a bit of fun, I've tryied
“bisecting” the amount of ram needed to make a successful boot. Platform
is a Lenovo Thinkpad x230 with 4G of ram.

mem=300M bad
mem=4000M good
mem=2000M bad
mem=3000M bad
mem=3500M good
mem=3250M bad
mem=3375M bad
mem=3437M good
mem=3406M bad
mem=3421M bad
mem=3429M bad
mem=3433M good
mem=3431M bad
mem=3432M bad

So I'm not sure what happens at the 3433M boundary, but there's
definitely something fishy. And 3.5G ram doesn't look like a very
specific machine (although I can't test without artificially setting the
memory limit (I only have one 4096M sodimm).

I'll try to git bisect between 3.8 and 3.10 and using mem=3432M when I
have more time.

Regards,
-- 
Yves-Alexis

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