On Tue, Dec 14, 2010 at 12:35 AM, Greg Ungerer <[email protected]> wrote:
> What version of uClinux are you using?
> The specifics of the idle state are also dependent on the specific
> vendor ARM device you are using. What is the exact part you are
> using?
Hi Greg,
I have found an issue. I am using ARM946E, uClinux kerenel 2.6.
In arch/arm/kernel/process.c I can see that default_idle() function is
calling arch_idle(), which is defined in include/asm/arch/system.h and
is basically call to a architecture specific cpu_arm946_do_idle()
which is defined in arch/arm/mm/proc-arm946.S and represents CP15
manipulation to implement "wait for interrupt" operation.
What is suprising, is the comment in arch_idle() function :
/*
* Set the processor (CP15) into 'Wait for Interrupt' mode.
* Unlike disabling the processor clock via the PMC (above)
* this allows the processor to be woken via JTAG.
*/
but this does not seem to be true at all.
Commenting out code which does "wait for interrupt" operation solves
the problem.
Best regards,
Drasko
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