From: eric@eukrea.com (Eric Bénard)
To: linux-arm-kernel@lists.infradead.org
Subject: I.MX35 GPIO IRQ + Preempt -> Oops
Date: Sun, 03 Oct 2010 19:15:21 +0200 [thread overview]
Message-ID: <4CA8BA29.5060600@eukrea.com> (raw)
In-Reply-To: <20101003162021.GD32736@n2100.arm.linux.org.uk>
Le 03/10/2010 18:20, Russell King - ARM Linux a ?crit :
> On Sun, Oct 03, 2010 at 05:25:31PM +0200, Eric B?nard wrote:
>> Hi Russell,
>>
>> Le 03/10/2010 13:41, Russell King - ARM Linux a ?crit :
>>> The common theme here looks like instruction cache corruption in
>>> default_idle() - iow, the CPU isn't executing the code which is in
>>> memory.
>>>
>> thanks for the analysis.
>> This problem seems to be related to the ARM11 bug described in page 4 of
>> this PDF :
>> http://cache.freescale.com/files/dsp/doc/errata/IMX35CE.pdf?fpsp=1
>>
>> ENGcm09472 ARM: WFI and interrupt problems
>>
>> Description:
>> There are two issues:
>> ? The behavior of the FIQ signal to the ARM11 core can cause a problem
>> when exiting WFI mode.
>
> Are you using FIQs? The kernel normally uses IRQs unless you explicitly
> do something that with FIQs.
>
the FIQ is used for the imx-ssi driver.
It seems that removing the cpu_do_idle() call in
plat-mxc/include/mach/system.h "fix" the problem.
Eric
next prev parent reply other threads:[~2010-10-03 17:15 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-02 13:55 I.MX35 GPIO IRQ + Preempt -> Oops Eric Bénard
2010-10-03 11:41 ` Russell King - ARM Linux
2010-10-03 15:25 ` Eric Bénard
2010-10-03 16:20 ` Russell King - ARM Linux
2010-10-03 17:15 ` Eric Bénard [this message]
2010-10-04 7:39 ` Uwe Kleine-König
2010-10-04 8:08 ` Eric Bénard
2010-10-04 12:07 ` Eric Bénard
2010-10-05 5:06 ` Marc Reilly
2010-10-05 7:28 ` Eric Bénard
2010-10-05 9:13 ` Eric Bénard
2010-10-05 9:25 ` [PATCH/RFC] i.MX31 and i.MX35 : fix errate TLSbo65953 and ENGcm09472 Eric Bénard
2010-10-05 9:45 ` Sascha Hauer
2010-10-05 12:00 ` [PATCH v2] " Eric Bénard
2010-10-05 18:33 ` Uwe Kleine-König
2010-10-05 19:31 ` Eric Bénard
2010-10-05 19:46 ` Uwe Kleine-König
2010-10-05 20:00 ` Eric Bénard
2010-10-05 20:04 ` Uwe Kleine-König
2010-10-05 20:27 ` Eric Bénard
2010-10-06 2:28 ` Nicolas Pitre
2010-10-06 11:09 ` Eric Bénard
2010-10-08 8:49 ` [PATCH v3] " Eric Bénard
2010-10-07 7:27 ` [PATCH v2] " Russell King - ARM Linux
2010-10-05 16:29 ` [PATCH/RFC] " Uwe Kleine-König
2010-10-05 16:48 ` Eric Bénard
2010-10-05 17:40 ` Uwe Kleine-König
2010-10-06 6:35 ` Daniel Mack
2010-10-06 7:03 ` Uwe Kleine-König
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