I.MX35 GPIO IRQ + Preempt -> Oops
u.kleine-koenig at pengutronix.de
Mon Oct 4 03:39:20 EDT 2010
On Sun, Oct 03, 2010 at 07:15:21PM +0200, Eric Bénard wrote:
> Le 03/10/2010 18:20, Russell King - ARM Linux a écrit :
>> On Sun, Oct 03, 2010 at 05:25:31PM +0200, Eric Bénard wrote:
>>> Hi Russell,
>>> Le 03/10/2010 13:41, Russell King - ARM Linux a écrit :
>>>> The common theme here looks like instruction cache corruption in
>>>> default_idle() - iow, the CPU isn't executing the code which is in
>>> thanks for the analysis.
>>> This problem seems to be related to the ARM11 bug described in page 4 of
>>> this PDF :
>>> ENGcm09472 ARM: WFI and interrupt problems
>>> 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.
Does deselecting imx-ssi "fixes" the problem, too?
Do you have traffic on the ssi unit when the problem occurs?
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