Andrey Petrov (andrey.petrov@intel.com) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/17663 -gerrit commit 2b60be5e7e3ebbb4dfe70827ed228c9ec8c27cc8 Author: Andrey Petrov <andrey.petrov@intel.com> Date: Wed Nov 30 16:05:56 2016 -0800 soc/intel/apollolake: Enable ACPI PM timer emulation on all CPUs Currently we enable ACPI PM timer emulation only on BSP. So the timer doesn't work on other cores and that breaks OSes that use it. Also, microcode uses this information to figure out ACPI IO base, and that is used for other features. This patch enables ACPI timer emulation on all the logical CPUs. BUG=chrome-os-partner:60011 TEST=iotools rdmsr x 0x121, x={0..3}, make sure it is set Change-Id: I0d6cb8761c1c25d3a2fcf59a49c1eda9e4ccc70c Signed-off-by: Andrey Petrov <andrey.petrov@intel.com> --- src/soc/intel/apollolake/cpu.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/src/soc/intel/apollolake/cpu.c b/src/soc/intel/apollolake/cpu.c index 916d7c5..85121f0 100644 --- a/src/soc/intel/apollolake/cpu.c +++ b/src/soc/intel/apollolake/cpu.c @@ -49,6 +49,14 @@ static const struct reg_script core_msr_script[] = { */ REG_MSR_RMW(MSR_FEATURE_CONFIG, ~FEATURE_CONFIG_RESERVED_MASK, FEATURE_CONFIG_LOCK), + /* + * Enable ACPI PM timer emulation, which also lets microcode know + * location of ACPI_PMIO_BASE, that it turns allows other features + * to work. + */ + REG_MSR_WRITE(MSR_EMULATE_PM_TMR, + (((3579545ULL << 32) / CTC_FREQ) << 32) | EMULATE_PM_TMR_EN | + (ACPI_PMIO_BASE + R_ACPI_PM1_TMR)), REG_SCRIPT_END };