Reviewed-by: Michael Kinney
> -Original Message-
> From: Zeng, Star
> Sent: Tuesday, August 16, 2016 7:27 PM
> To: edk2-devel@lists.01.org
> Cc: Zeng, Star ; Kinney, Michael D
> ;
> Gao, Liming ; Paolo Bonzini ;
> Lohr, Paul A
>
> Subject: [PATCH] PcAtChipsetPkg AcpiTimerLib: Wait 363
el@lists.01.org
> Cc: Kinney, Michael D ; Gao, Liming
>
> Subject: Re: [edk2] [PATCH] PcAtChipsetPkg AcpiTimerLib: Wait 363 ACPI timer
> counts
> to get TSC Freq
>
>
>
> On 17/08/2016 04:26, Star Zeng wrote:
> > Compute the number of ticks to wait to measure TSC
On 17/08/2016 04:26, Star Zeng wrote:
> Compute the number of ticks to wait to measure TSC frequency.
> Instead of (ACPI_TIMER_FREQUENCY / 1) = 357 and 357 * 1 = 357,
> use 363 * 9861 = 3579543 Hz which is within 2 Hz of ACPI_TIMER_FREQUENCY.
> 363 counts is a calibration time of 101.
Compute the number of ticks to wait to measure TSC frequency.
Instead of (ACPI_TIMER_FREQUENCY / 1) = 357 and 357 * 1 = 357,
use 363 * 9861 = 3579543 Hz which is within 2 Hz of ACPI_TIMER_FREQUENCY.
363 counts is a calibration time of 101.4 uS.
The idea comes from Michael and Paolo.
C
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