Hi
2009/10/12 akshay ts <taksh...@yahoo.co.in>:
> Hi,
> I want to know what is the instruction for sleeping in ARM Cortex A8.
> I did execute a WFI instruction seems to be a NOP.
> void cpu_idle()
> {
> unsigned long tmp = 0;
> asm("b 1f\n\t"
> ".align 5\n\t"
> "1:\n\t"
> "mcr p15, 0, %0, c7, c10, 5\n\t"
> "mcr p15, 0, %0, c7, c10, 4\n\t"
> "mcr p15, 0, %0, c7, c0, 4" :: "r" (tmp));
> return;
> }
> The above function doesnt seem to work.
> Please let me know exact instructions to follow.
Well, the idle-code in Linux looks like:
/*
* cpu_v7_do_idle()
*
* Idle the processor (eg, wait for interrupt).
*
* IRQs are already disabled.
*/
ENTRY(cpu_v7_do_idle)
dsb @ WFI may enter a low-power mode
wfi
mov pc, lr
ENDPROC(cpu_v7_do_idle)
So you may want to try that instead.
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