diff --git a/src/mainboard/google/myst/variants/baseboard/devicetree.cb b/src/mainboard/google/myst/variants/baseboard/devicetree.cb
index 97994c7885..55a14c077b 100644
--- a/src/mainboard/google/myst/variants/baseboard/devicetree.cb
+++ b/src/mainboard/google/myst/variants/baseboard/devicetree.cb
@@ -310,6 +310,7 @@ chip soc/amd/phoenix
 			device ref acp on end # Audio Processor (ACP)
 			device ref mp2 on end # Sensor Fusion Hub (MP2)
 		end
+		device ref gpp_bridge_b off end # Internal GPP Bridge 1 to Bus B
 		device ref gpp_bridge_c on  # Internal GPP Bridge 2 to Bus C
 			device ref usb4_xhci_0 on
 				chip drivers/usb/acpi
diff --git a/src/soc/amd/phoenix/chipset_fsp.cb b/src/soc/amd/phoenix/chipset_fsp.cb
index 2d1e17080a..d461ac5d49 100644
--- a/src/soc/amd/phoenix/chipset_fsp.cb
+++ b/src/soc/amd/phoenix/chipset_fsp.cb
@@ -30,7 +30,7 @@ chip soc/amd/phoenix
 		device pci 04.1 alias usb4_pcie_bridge_1 off end
 
 		device pci 08.0 on end # Dummy device function, do not disable
-		device pci 08.1 alias gpp_bridge_a off  # Internal GPP Bridge 0 to Bus A
+		device pci 08.1 alias gpp_bridge_a on  # Internal GPP Bridge 0 to Bus A
 			ops amd_internal_pcie_gpp_ops
 			device pci 0.0 alias gfx off ops amd_graphics_ops end # Internal GPU (GFX)
 			device pci 0.1 alias gfx_hda off end # Display HD Audio Controller (GFXAZ)
@@ -82,13 +82,13 @@ chip soc/amd/phoenix
 			device pci 0.6 alias hda off end # Audio Processor HD Audio Controller (main AZ)
 			device pci 0.7 alias mp2 off end # Sensor Fusion Hub (MP2)
 		end
-		device pci 08.2 alias gpp_bridge_b off # Internal GPP Bridge 1 to Bus B
+		device pci 08.2 alias gpp_bridge_b on # Internal GPP Bridge 1 to Bus B
 			ops amd_internal_pcie_gpp_ops
 			device pci 0.0 on end # dummy, do not disable
 			device pci 0.1 alias ipu off end
 		end
 
-		device pci 08.3 alias gpp_bridge_c off # Internal GPP Bridge 2 to Bus C
+		device pci 08.3 alias gpp_bridge_c on # Internal GPP Bridge 2 to Bus C
 			ops amd_internal_pcie_gpp_ops
 			device pci 0.0 on end # dummy, do not disable
 			device pci 0.3 alias usb4_xhci_0 off
diff --git a/src/soc/amd/phoenix/chipset_opensil.cb b/src/soc/amd/phoenix/chipset_opensil.cb
index 42f36bcc34..fd1563b670 100644
--- a/src/soc/amd/phoenix/chipset_opensil.cb
+++ b/src/soc/amd/phoenix/chipset_opensil.cb
@@ -50,7 +50,7 @@ chip soc/amd/phoenix
 		device pci 04.1 alias usb4_pcie_bridge_1 off end
 
 		device pci 08.0 on end # Dummy device function, do not disable
-		device pci 08.1 alias gpp_bridge_a off  # Internal GPP Bridge 0 to Bus A
+		device pci 08.1 alias gpp_bridge_a on  # Internal GPP Bridge 0 to Bus A
 			ops amd_internal_pcie_gpp_ops
 			device pci 0.0 alias gfx off ops amd_graphics_ops end # Internal GPU (GFX)
 			device pci 0.1 alias gfx_hda off end # Display HD Audio Controller (GFXAZ)
@@ -102,13 +102,13 @@ chip soc/amd/phoenix
 			device pci 0.6 alias hda off end # Audio Processor HD Audio Controller (main AZ)
 			device pci 0.7 alias mp2 off end # Sensor Fusion Hub (MP2)
 		end
-		device pci 08.2 alias gpp_bridge_b off # Internal GPP Bridge 1 to Bus B
+		device pci 08.2 alias gpp_bridge_b on # Internal GPP Bridge 1 to Bus B
 			ops amd_internal_pcie_gpp_ops
 			device pci 0.0 on end # dummy, do not disable
 			device pci 0.1 alias ipu off end
 		end
 
-		device pci 08.3 alias gpp_bridge_c off # Internal GPP Bridge 2 to Bus C
+		device pci 08.3 alias gpp_bridge_c on # Internal GPP Bridge 2 to Bus C
 			ops amd_internal_pcie_gpp_ops
 			device pci 0.0 on end # dummy, do not disable
 			device pci 0.3 alias usb4_xhci_0 off