diff --git a/src/mainboard/siemens/mc_apl1/variants/mc_apl3/mainboard.c b/src/mainboard/siemens/mc_apl1/variants/mc_apl3/mainboard.c
index c17f1be..b61f32d 100644
--- a/src/mainboard/siemens/mc_apl1/variants/mc_apl3/mainboard.c
+++ b/src/mainboard/siemens/mc_apl1/variants/mc_apl3/mainboard.c
@@ -14,8 +14,6 @@
 #include <baseboard/variants.h>
 #include <types.h>
 
-#define TX_DWORD3	0xa8c
-
 void variant_mainboard_final(void)
 {
 	struct device *dev = NULL;
diff --git a/src/mainboard/siemens/mc_apl1/variants/mc_apl5/mainboard.c b/src/mainboard/siemens/mc_apl1/variants/mc_apl5/mainboard.c
index 7362a48..1e7fa37 100644
--- a/src/mainboard/siemens/mc_apl1/variants/mc_apl5/mainboard.c
+++ b/src/mainboard/siemens/mc_apl1/variants/mc_apl5/mainboard.c
@@ -13,8 +13,6 @@
 #include <baseboard/variants.h>
 #include <types.h>
 
-#define TX_DWORD3	0xa8c
-
 void variant_mainboard_final(void)
 {
 	struct device *dev = NULL;
@@ -34,11 +32,6 @@
 	 */
 	pcr_or32(PID_LPC, PCR_LPC_PRC, (PCR_LPC_CCE_EN | PCR_LPC_PCE_EN));
 
-	/* Correct the SATA transmit signal via the High Speed I/O Transmit Control Register 3.
-	   Bit [23:16] set the output voltage swing for TX line. The value 0x4a sets the swing
-	   level to 0.58 V. */
-	pcr_rmw32(PID_MODPHY, TX_DWORD3, (0x00 << 16), (0x4a << 16));
-
 	/* Set Master Enable for on-board PCI device if allowed. */
 	dev = dev_find_device(PCI_VID_SIEMENS, 0x403e, 0);
 	if (dev) {
diff --git a/src/mainboard/siemens/mc_apl1/variants/mc_apl6/mainboard.c b/src/mainboard/siemens/mc_apl1/variants/mc_apl6/mainboard.c
index b5aa068..1856a35 100644
--- a/src/mainboard/siemens/mc_apl1/variants/mc_apl6/mainboard.c
+++ b/src/mainboard/siemens/mc_apl1/variants/mc_apl6/mainboard.c
@@ -14,8 +14,6 @@
 #include <baseboard/variants.h>
 #include <types.h>
 
-#define TX_DWORD3	0xa8c
-
 void variant_mainboard_final(void)
 {
 	struct device *dev = NULL;