diff --git a/src/mainboard/google/fizz/devicetree.cb b/src/mainboard/google/fizz/devicetree.cb
index ec763d6..5eeb03c 100644
--- a/src/mainboard/google/fizz/devicetree.cb
+++ b/src/mainboard/google/fizz/devicetree.cb
@@ -296,9 +296,9 @@
 
 	# Must leave UART0 enabled or SD/eMMC will not work as PCI
 	register "SerialIoDevMode" = "{
-		[PchSerialIoIndexI2C0]  = PchSerialIoPci,
+		[PchSerialIoIndexI2C0]  = PchSerialIoDisabled,
 		[PchSerialIoIndexI2C1]  = PchSerialIoDisabled,
-		[PchSerialIoIndexI2C2]  = PchSerialIoPci,
+		[PchSerialIoIndexI2C2]  = PchSerialIoDisabled,
 		[PchSerialIoIndexI2C3]  = PchSerialIoDisabled,
 		[PchSerialIoIndexI2C4]  = PchSerialIoDisabled,
 		[PchSerialIoIndexI2C5]  = PchSerialIoPci,
@@ -329,9 +329,9 @@
 		device pci 14.0 on  end # USB xHCI
 		device pci 14.1 off end # USB xDCI (OTG)
 		device pci 14.2 on  end # Thermal Subsystem
-		device pci 15.0 on  end # I2C #0
+		device pci 15.0 off end # I2C #0
 		device pci 15.1 off end # I2C #1
-		device pci 15.2 on  end # I2C #2
+		device pci 15.2 off end # I2C #2
 		device pci 15.3 off end # I2C #3
 		device pci 16.0 on  end # Management Engine Interface 1
 		device pci 16.1 off end # Management Engine Interface 2