diff --git a/libraries/libstratosphere/source/pinmux/driver/board/nintendo/nx/pinmux_board_driver_api.cpp b/libraries/libstratosphere/source/pinmux/driver/board/nintendo/nx/pinmux_board_driver_api.cpp
index 84ff19938..827a02c1c 100644
--- a/libraries/libstratosphere/source/pinmux/driver/board/nintendo/nx/pinmux_board_driver_api.cpp
+++ b/libraries/libstratosphere/source/pinmux/driver/board/nintendo/nx/pinmux_board_driver_api.cpp
@@ -17,6 +17,7 @@
 #include "pinmux_pad_index.hpp"
 #include "pinmux_board_driver_api.hpp"
 #include "pinmux_platform_pads.hpp"
+#include "pinmux_build_config.hpp"
 
 namespace ams::pinmux::driver::board::nintendo::nx {
 
@@ -99,6 +100,31 @@ namespace ams::pinmux::driver::board::nintendo::nx {
             UpdateSinglePinmuxPad({ PinmuxPadIndex_Sdmmc2Dat6, 0x2000, 0x2000 });
             UpdateSinglePinmuxPad({ PinmuxPadIndex_Sdmmc2Dat7, 0x2000, 0x2000 });
         }
+
+        #if defined(AMS_PINMUX_CONFIG_RIGHT_RAIL_AS_UART)
+        UpdateSinglePinmuxPad({ 
+            .index       = PinmuxPadIndex_Uart2Tx,
+            .option      = 0,               /* PinmuxPadPm_Pm0 | PinmuxOpt_NoPupd | PinmuxOpt_Output */
+            .option_mask = (0x7|0x18|0x60), /* PinmuxOptBitMask_Pm | PinmuxOptBitMask_Pupd | PinmuxOptBitMask_Dir */
+        });
+        UpdateSinglePinmuxPad({ 
+            .index       = PinmuxPadIndex_Uart2Cts,
+            .option      = 0x20,            /* PinmuxPadPm_Pm0 | PinmuxOpt_NoPupd | PinmuxOpt_Input */
+            .option_mask = (0x7|0x18|0x60), /* PinmuxOptBitMask_Pm | PinmuxOptBitMask_Pupd | PinmuxOptBitMask_Dir */
+        });
+        #endif
+        #if defined(AMS_PINMUX_CONFIG_LEFT_RAIL_AS_UART)
+        UpdateSinglePinmuxPad({ 
+            .index       = PinmuxPadIndex_Uart3Tx,
+            .option      = 0,               /* PinmuxPadPm_Pm0 | PinmuxOpt_NoPupd | PinmuxOpt_Output */
+            .option_mask = (0x7|0x18|0x60), /* PinmuxOptBitMask_Pm | PinmuxOptBitMask_Pupd | PinmuxOptBitMask_Dir */
+        });
+        UpdateSinglePinmuxPad({ 
+            .index       = PinmuxPadIndex_Uart3Cts,
+            .option      = 0x20,            /* PinmuxPadPm_Pm0 | PinmuxOpt_NoPupd | PinmuxOpt_Input */
+            .option_mask = (0x7|0x18|0x60), /* PinmuxOptBitMask_Pm | PinmuxOptBitMask_Pupd | PinmuxOptBitMask_Dir */
+        });
+        #endif
     }
 
     void SetInitialDrivePadConfig() {
diff --git a/libraries/libstratosphere/source/pinmux/driver/board/nintendo/nx/pinmux_build_config.hpp b/libraries/libstratosphere/source/pinmux/driver/board/nintendo/nx/pinmux_build_config.hpp
new file mode 100644
index 000000000..530af4325
--- /dev/null
+++ b/libraries/libstratosphere/source/pinmux/driver/board/nintendo/nx/pinmux_build_config.hpp
@@ -0,0 +1,20 @@
+/*
+ * Copyright (c) Atmosphère-NX
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#pragma once
+#include <stratosphere.hpp>
+
+// #define AMS_PINMUX_CONFIG_RIGHT_RAIL_AS_UART
+// #define AMS_PINMUX_CONFIG_LEFT_RAIL_AS_UART
\ No newline at end of file