I.MX35 GPIO IRQ + Preempt -> Oops
eric at eukrea.com
Sun Oct 3 13:15:21 EDT 2010
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.
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