Re: [U-Boot] [PATCH v2 02/12] x86: Allow a hardcoded TSC frequency provided by Kconfig

6 Jan 2015


      On 5 January 2015 at 08:28, 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

Changes in v2:

Spell out TSC, MSR and PIT in the Kconfig help

Acked-by: Simon Glass sjg@chromium.org
...
arch/x86/Kconfig         | 20 ++++++++++++++++++++
 arch/x86/lib/tsc_timer.c |  8 ++++++--
 2 files changed, 26 insertions(+), 2 deletions(-)