diff --git a/src/mainboard/siemens/mc_apl1/mainboard.c b/src/mainboard/siemens/mc_apl1/mainboard.c
index b2cd449..bca0cbb 100644
--- a/src/mainboard/siemens/mc_apl1/mainboard.c
+++ b/src/mainboard/siemens/mc_apl1/mainboard.c
@@ -12,6 +12,7 @@
 #include <intelblocks/fast_spi.h>
 #include <intelblocks/systemagent.h>
 #include <soc/pci_devs.h>
+#include <soc/ramstage.h>
 #include <string.h>
 #include <timer.h>
 #include <timestamp.h>
@@ -173,6 +174,29 @@
 	printk(BIOS_DEBUG, "PMIC: Configure PMIC IMON - End\n");
 }
 
+void mainboard_silicon_init_params(FSP_S_CONFIG *silconfig)
+{
+	printk(BIOS_DEBUG, "MAINBOARD: %s/%s called\n", __FILE__, __func__);
+
+	/* Disable CPU power states (C-states) */
+	silconfig->EnableCx = 0;
+
+	/* Set max Pkg Cstate to PkgC0C1 */
+	silconfig->PkgCStateLimit = 0;
+
+	/* Disable PCIe Transmitter Half Swing for all RPs */
+	memset(silconfig->PcieRpTransmitterHalfSwing, 0,
+			sizeof(silconfig->PcieRpTransmitterHalfSwing));
+
+	/* Disable PCI Express Active State Power Management for all RPs */
+	memset(silconfig->PcieRpAspm, 0,
+			sizeof(silconfig->PcieRpAspm));
+
+	/* Disable PCI Express L1 Substate for all RPs */
+	memset(silconfig->PcieRpL1Substates, 0,
+			sizeof(silconfig->PcieRpL1Substates));
+}
+
 static void mainboard_init(void *chip_info)
 {
 	const struct pad_config *pads;