Hello John, On 30/04/2015 18:42, John Stultz wrote:
> On Thu, Apr 30, 2015 at 5:46 AM, Mason wrote: > >> I wanted to enable high-resolution timers on this Cortex A9 system, >> but it seems there is more to it than just enabling >> >> CONFIG_HIGH_RES_TIMERS=y >> >> (The system is limited to jiffy resolution.) > > You might make sure you've got a HRT enabled clocksource installed? > > You might check > /sys/devices/system/clocksource/clocksource0/current_clocksource ? Thanks for the suggestion, I will check on Monday. The clocksource is a constant 27 MHz 32-bit counter. It seems the problem comes from the clockevent source, which is marked CLOCK_EVT_FEAT_C3STOP. If I remove that flag, then hrtimers are enabled; but the flag is there for a good reason, I assume. I will resend my message to the LAKML on Monday. Regards. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
