From: Sascha Hauer <s.hauer@pengutronix.de>
To: Tomasz Figa <t.figa@samsung.com>
Cc: devicetree-discuss@lists.ozlabs.org,
linux-samsung-soc@vger.kernel.org, linux@arm.linux.org.uk,
nico@linaro.org, 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: Fri, 11 Jan 2013 17:45:31 +0100 [thread overview]
Message-ID: <20130111164531.GC13025@pengutronix.de> (raw)
In-Reply-To: <7811936.npteFbuYu2@amdc1227>
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.
Sascha
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next prev parent reply other threads:[~2013-01-11 16:45 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 ` Sascha Hauer [this message]
2013-01-14 22:13 ` Early kernel hang with big DTB appended Nicolas Pitre
2013-01-15 10:53 ` Sascha Hauer
2013-01-15 11:26 ` Tomasz Figa
2013-01-15 18:12 ` Nicolas Pitre
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