[U-Boot] CPU Sleep in ARM Cortex A8

[akshay ts]

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.

Warm Regards,
Akshay


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