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-rw-r--r--src/cpu/intel/model_206ax/finalize.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/src/cpu/intel/model_206ax/finalize.c b/src/cpu/intel/model_206ax/finalize.c
index 68cef8d782..4ed5d1e5f8 100644
--- a/src/cpu/intel/model_206ax/finalize.c
+++ b/src/cpu/intel/model_206ax/finalize.c
@@ -49,11 +49,24 @@ void intel_model_206ax_finalize_smm(void)
if (cpuid_ecx(1) & (1 << 25))
msr_set_bit(MSR_FEATURE_CONFIG, 0);
+#ifdef LOCK_POWER_CONTROL_REGISTERS
+ /*
+ * Lock the power control registers.
+ *
+ * These registers can be left unlocked if modifying power
+ * limits from the OS is desirable. Modifying power limits
+ * from the OS can be especially useful for experimentation
+ * during early phases of system bringup while the thermal
+ * power envelope is being proven.
+ */
+
msr_set_bit(MSR_PP0_CURRENT_CONFIG, 31);
msr_set_bit(MSR_PP1_CURRENT_CONFIG, 31);
msr_set_bit(MSR_PKG_POWER_LIMIT, 63);
msr_set_bit(MSR_PP0_POWER_LIMIT, 31);
msr_set_bit(MSR_PP1_POWER_LIMIT, 31);
+#endif
+
msr_set_bit(MSR_MISC_PWR_MGMT, 22);
msr_set_bit(MSR_LT_LOCK_MEMORY, 0);
}