From: baruch@tkos.co.il (Baruch Siach)
Date: Wed, 4 Aug 2010 10:00:29 +0300
Subject: [patch 0/2] ARM: Disable outer cache before kexec call -V3
In-Reply-To: <4C590CBD.1080305@swapp-eng.it>
References: <20100705113029.082013074@linutronix.de>
	<4C58259A.3080404@swapp-eng.it>
	<5A47E75E594F054BAF48C5E4FC4B92AB0321623966@dbde02.ent.ti.com>
	<4C590CBD.1080305@swapp-eng.it>
Message-ID: <20100804070029.GD17208@jasper.tkos.co.il>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

Hi Andrea,

On Wed, Aug 04, 2010 at 08:46:21AM +0200, Andrea Paterniani wrote:
> Il 03/08/2010 19.36, Gadiyar, Anand ha scritto:
> >Andrea Paterniani wrote:
> >>Hi,
> >>      I have applied your patches to kernel 2.6.35-rc4 running on my beagleboard.
> >>I'm using kexec-tools-2.0.1.
> >>
> >>My u-boot bootargs is:
> >>      console=ttyS2,115200n8 root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwait ip=192.168.2.13::255.255.255.0
> >>
> >>To restart the system I type:
> >>  >  sync
> >>  >  kexec -l /boot/zImage --append="console=ttyS2,115200n8 root=/dev/mmcblk0p2 rw rootfstype=ext3 rootwait ip=192.168.2.13::255.255.255.0"
> >>  >  kexec -e
> >>
> >>Not every time the system restart.
> >>In some cases no output on the console after the following:
> >>      Bye!
> >>      Uncompressing Linux... done, booting the kernel.
> >>
> >>Any idea?
> >>
> >Can you try building your kernel with CONFIG_EARLY_PRINTK,
> >and add the word "earlyprintk" to your bootargs?
> >
> How to enable EARLY_PRINTK for ARM architecture?
> Browsing kernel source I find arch/arm/kernel/early_printk.c but no
> way to enable CONFIG_EARLY_PRINTK from make menuconfig.
> Is there any patch to have this config option for ARM?

EARLY_PRINTK is in arch/arm/Kconfig.debug. It depends on DEBUG_LL, though. So 
you must enable DEBUG_LL to make EARLY_PRINTK visible.

baruch

> 
> - Andrea
> >
> >>Il 05/07/2010 13.52, Thomas Gleixner ha scritto:
> >>>The following patch series addresses the problem that the kexec code
> >>>does not disable the outer cache before disabling the inner cache and
> >>>jumping into the new kernel. This results in random crashes of the new
> >>>kernel.
> >>>
> >>>Changes since version 2:
> >>>
> >>>   - Use CLEAN_INV_WAY in l2x0_flush_all according to Catalin
> >>>
> >>>   - Rename outer_cache_disable() to outer_disable()
> >>>
> >>>   - Added a  BUG_ON() when l2x0_inv_all() is called with L2 enabled.
> >>>
> >>>Thanks,
> >>>
> >>>       tglx

-- 
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