diff --git a/src/mainboard/google/poppy/variants/baseboard/devicetree.cb b/src/mainboard/google/poppy/variants/baseboard/devicetree.cb
index 249183b420..ebbb12f973 100644
--- a/src/mainboard/google/poppy/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/baseboard/devicetree.cb
@@ -236,7 +236,7 @@ chip soc/intel/skylake
 		[PchSerialIoIndexI2C5]  = PchSerialIoPci,
 		[PchSerialIoIndexSpi0]  = PchSerialIoDisabled,
 		[PchSerialIoIndexSpi1]  = PchSerialIoDisabled,
-		[PchSerialIoIndexUart0] = PchSerialIoPci,
+		[PchSerialIoIndexUart0] = PchSerialIoSkipInit,
 		[PchSerialIoIndexUart1] = PchSerialIoDisabled,
 		[PchSerialIoIndexUart2] = PchSerialIoSkipInit,
 	}"
diff --git a/src/mainboard/google/poppy/variants/nami/devicetree.cb b/src/mainboard/google/poppy/variants/nami/devicetree.cb
index 51da81aa94..34163efc51 100644
--- a/src/mainboard/google/poppy/variants/nami/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/nami/devicetree.cb
@@ -256,7 +256,7 @@ chip soc/intel/skylake
 		[PchSerialIoIndexI2C5]  = PchSerialIoDisabled,
 		[PchSerialIoIndexSpi0]  = PchSerialIoPci,
 		[PchSerialIoIndexSpi1]  = PchSerialIoPci,
-		[PchSerialIoIndexUart0] = PchSerialIoPci,
+		[PchSerialIoIndexUart0] = PchSerialIoSkipInit,
 		[PchSerialIoIndexUart1] = PchSerialIoDisabled,
 		[PchSerialIoIndexUart2] = PchSerialIoSkipInit,
 	}"
diff --git a/src/mainboard/google/poppy/variants/rammus/devicetree.cb b/src/mainboard/google/poppy/variants/rammus/devicetree.cb
index b3812d704f..f2dc5b6b3b 100644
--- a/src/mainboard/google/poppy/variants/rammus/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/rammus/devicetree.cb
@@ -217,7 +217,7 @@ chip soc/intel/skylake
 		[PchSerialIoIndexI2C5]  = PchSerialIoPci,
 		[PchSerialIoIndexSpi0]  = PchSerialIoPci,
 		[PchSerialIoIndexSpi1]  = PchSerialIoDisabled,
-		[PchSerialIoIndexUart0] = PchSerialIoPci,
+		[PchSerialIoIndexUart0] = PchSerialIoSkipInit,
 		[PchSerialIoIndexUart1] = PchSerialIoDisabled,
 		[PchSerialIoIndexUart2] = PchSerialIoSkipInit,
 	}"
diff --git a/src/mainboard/google/poppy/variants/soraka/devicetree.cb b/src/mainboard/google/poppy/variants/soraka/devicetree.cb
index b44e867b5b..745d72ce32 100644
--- a/src/mainboard/google/poppy/variants/soraka/devicetree.cb
+++ b/src/mainboard/google/poppy/variants/soraka/devicetree.cb
@@ -237,7 +237,7 @@ chip soc/intel/skylake
 		[PchSerialIoIndexI2C5]  = PchSerialIoPci,
 		[PchSerialIoIndexSpi0]  = PchSerialIoDisabled,
 		[PchSerialIoIndexSpi1]  = PchSerialIoDisabled,
-		[PchSerialIoIndexUart0] = PchSerialIoPci,
+		[PchSerialIoIndexUart0] = PchSerialIoSkipInit,
 		[PchSerialIoIndexUart1] = PchSerialIoDisabled,
 		[PchSerialIoIndexUart2] = PchSerialIoSkipInit,
 	}"