[Qemu-devel] arm mptimer implementation - why prescaler is multiply by 10?

[Krzeminski, Marcin (Nokia - PL/Wroclaw)]

Hello,

 

I am playing with U-Boot on ARM under qemu.

U-boot uses mptimer, and under qemu one second takes about 1 in real world.

At the moment it seem that in u-boot is ok, so I have question about below function.

Why prescaler value is multiply by 10?

 

static inline uint64_t a9_gtimer_get_conv(A9GTimerState *s)

{

    uint64_t prescale = extract32(s->control, R_CONTROL_PRESCALER_SHIFT,

                                  R_CONTROL_PRESCALER_LEN);

 

    return (prescale + 1) * 10;

}

 

Regards,

Marcin