diff --git a/Source/Core/Core/BootManager.cpp b/Source/Core/Core/BootManager.cpp
index c5a526d262..ea26339e57 100644
--- a/Source/Core/Core/BootManager.cpp
+++ b/Source/Core/Core/BootManager.cpp
@@ -133,6 +133,21 @@ bool BootCore(Core::System& system, std::unique_ptr<BootParameters> boot,
   if (!boot->riivolution_patches.empty())
     Config::SetCurrent(Config::MAIN_FAST_DISC_SPEED, true);
 
+  if (system.IsTriforce())
+  {
+    // Attach Triforce Baseboard hardware if not overridden in any layer.
+    // Users may set these in their GameConfig if they want them not automatically attached.
+    if (GetActiveLayerForConfig(Config::MAIN_SERIAL_PORT_1) == Config::LayerType::Base)
+    {
+      Config::SetCurrent(Config::MAIN_SERIAL_PORT_1, ExpansionInterface::EXIDeviceType::Baseboard);
+    }
+    if (GetActiveLayerForConfig(Config::GetInfoForSIDevice(0)) == Config::LayerType::Base)
+    {
+      Config::SetCurrent(Config::GetInfoForSIDevice(0),
+                         SerialInterface::SIDevices::SIDEVICE_AM_BASEBOARD);
+    }
+  }
+
   system.Initialize();
 
   Core::UpdateWantDeterminism(system, /*initial*/ true);