Re: [U-Boot] [RESEND PATCH v4 02/12] x86: Allow a hardcoded TSC frequency provided by Kconfig

On 6 January 2015 at 07:14, Bin Meng bmeng.cn@gmail.com wrote:

By default U-Boot automatically calibrates TSC running frequency via MSR and PIT. The calibration may not work on every x86 processor, so a new Kconfig option CONFIG_TSC_CALIBRATION_BYPASS is introduced to allow bypassing the calibration and assign a hardcoded TSC frequency CONFIG_TSC_FREQ_IN_MHZ.

Normally the bypass should be turned on in a simulation environment like qemu.

Signed-off-by: Bin Meng bmeng.cn@gmail.com Acked-by: Simon Glass sjg@chromium.org

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Changes in v4: None Changes in v3: None Changes in v2:

• Spell out TSC, MSR and PIT in the Kconfig help

arch/x86/Kconfig | 20 ++++++++++++++++++++ arch/x86/lib/tsc_timer.c | 8 ++++++-- 2 files changed, 26 insertions(+), 2 deletions(-)

Applied to u-boot-x86/next, thanks!