diff --git a/libexosphere/include/exosphere/tegra/tegra_ahb_arbc.hpp b/libexosphere/include/exosphere/tegra/tegra_ahb_arbc.hpp
index d8a5d432..b130ada9 100644
--- a/libexosphere/include/exosphere/tegra/tegra_ahb_arbc.hpp
+++ b/libexosphere/include/exosphere/tegra/tegra_ahb_arbc.hpp
@@ -23,6 +23,7 @@
 #define AHB_MASTER_SWID               (0x018)
 #define AHB_MASTER_SWID_1             (0x038)
 #define AHB_GIZMO_TZRAM               (0x054)
+#define AHB_AHB_SPARE_REG             (0x110)
 
 #define AHB_REG_BITS_MASK(NAME)                                      REG_NAMED_BITS_MASK    (AHB_, NAME)
 #define AHB_REG_BITS_VALUE(NAME, VALUE)                              REG_NAMED_BITS_VALUE   (AHB_, NAME, VALUE)
@@ -39,3 +40,8 @@ DEFINE_AHB_REG_BIT_ENUM(ARBITRATION_DISABLE_COP,     1, ENABLE, DISABLE);
 DEFINE_AHB_REG_BIT_ENUM(ARBITRATION_DISABLE_AHBDMA,  5, ENABLE, DISABLE);
 DEFINE_AHB_REG_BIT_ENUM(ARBITRATION_DISABLE_USB,     6, ENABLE, DISABLE);
 DEFINE_AHB_REG_BIT_ENUM(ARBITRATION_DISABLE_USB2,   18, ENABLE, DISABLE);
+
+DEFINE_AHB_REG(AHB_SPARE_REG_CSITE_PADMACRO3_TRIM_SEL, 0, 5);
+DEFINE_AHB_REG_BIT_ENUM(AHB_SPARE_REG_OBS_OVERRIDE_EN, 5, DISABLE, ENABLE);
+DEFINE_AHB_REG_BIT_ENUM(AHB_SPARE_REG_APB2JTAG_OVERRIDE_EN, 6, DISABLE, ENABLE);
+DEFINE_AHB_REG(AHB_SPARE_REG_AHB_SPARE_REG, 12, 32-12);