From: Nicolas Pitre <nicolas.pitre@linaro.org>
To: Tomasz Figa <t.figa@samsung.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>,
devicetree-discuss@lists.ozlabs.org,
linux-samsung-soc@vger.kernel.org,
Russell King - ARM Linux <linux@arm.linux.org.uk>,
kgene.kim@samsung.com, thomas.abraham@linaro.org,
bones@secretlab.ca, linux-arm-kernel@lists.infradead.org
Subject: Re: Early kernel hang with big DTB appended
Date: Tue, 15 Jan 2013 13:12:46 -0500 (EST) [thread overview]
Message-ID: <alpine.LFD.2.02.1301151311400.6300@xanadu.home> (raw)
In-Reply-To: <1389186.eYbeMx0y73@amdc1227>
On Tue, 15 Jan 2013, Tomasz Figa wrote:
> Hi Nicolas,
>
> On Monday 14 of January 2013 17:13:09 Nicolas Pitre wrote:
> > On Fri, 11 Jan 2013, Sascha Hauer wrote:
> > > On Thu, Jan 03, 2013 at 04:55:00PM +0100, Tomasz Figa wrote:
> > > > Hi,
> > > >
> > > > I'm observing strange behavior when booting 3.8-rc1 and -rc2 with
> > > > appended DTB. The kernel hangs very early when the DTB is bigger
> > > > than some threshold somewhere around 24 KiB. With fullest possible
> > > > low level UART debugging (and printk patched to use printascii) I'm
> > > > receiving following output:
> > > >
> > > > Uncompressing Linux... done, booting the kernel.
> > > > Booting Linux on physical CPU 0xa00
> > > > Linux version 3.8.0-rc1-00073-gdf6efca-dirty (t.figa@amdc1227) (gcc
> > > > version 4.5.2 (Gentoo 4.5.2 p1.2, pie-0.4.5) ) #2 SMP PREEMPT Thu
> > > > Jan 3
> > > > 15:37:35 CET 2013
> > > > CPU: ARMv7 Processor [413fc090] revision 0 (ARMv7), cr=10c53c7d
> > > > CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction
> > > > cache
> > > >
> > > > I tested on two Exynos-based boards (exynos4210-trats and one
> > > > internal
> > > > exynos4412-based board) and same happens on both.
> > > >
> > > > Do you have any ideas?
> > >
> > > Another thing besides the things already mentioned is that the dtb may
> > > not cross a 1MiB boundary. The Kernel uses a single 1Mib section
> > > (aligned to 1Mib) to initially map the dtb. Once you cross that
> > > boundary parts of the dtb won't be accessible for the Kernel anymore.
> >
> > Crap. You're right. This patch should fix this issue.
> >
> > @Tomasz: please could you confirm this fixes your initial problem?
>
> I just tested the patch and it fixes the problem indeed. The kernel
> now boots successfully after applying the patch, while undoing it
> makes the kernel fail to boot again. Thanks.
>
> Tested-by: Tomasz Figa <t.figa@samsung.com>
Thanks.
The patch is queued as 7628/1 in RMK's patch system.
Nicolas
prev parent reply other threads:[~2013-01-15 18:12 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-03 15:55 Early kernel hang with big DTB appended Tomasz Figa
2013-01-03 18:40 ` Bryan Evenson
2013-01-04 10:26 ` Tomasz Figa
2013-01-04 2:48 ` Nicolas Pitre
2013-01-04 10:18 ` Tomasz Figa
2013-01-14 8:45 ` $(make uImage) is stupid [Was: Re: Early kernel hang with big DTB appended] Uwe Kleine-König
2013-01-11 16:45 ` Early kernel hang with big DTB appended Sascha Hauer
2013-01-14 22:13 ` Nicolas Pitre
2013-01-15 10:53 ` Sascha Hauer
2013-01-15 11:26 ` Tomasz Figa
2013-01-15 18:12 ` Nicolas Pitre [this message]
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