diff --git a/repos/base-hw/src/core/imx53/trustzone/platform_support.cc b/repos/base-hw/src/core/imx53/trustzone/platform_support.cc
index 9bea14a998..6d5258aaf4 100644
--- a/repos/base-hw/src/core/imx53/trustzone/platform_support.cc
+++ b/repos/base-hw/src/core/imx53/trustzone/platform_support.cc
@@ -59,6 +59,9 @@ Native_region * Platform::_core_only_mmio_regions(unsigned const i)
 
 		/* vm state memory */
 		{ Trustzone::VM_STATE_BASE, Trustzone::VM_STATE_SIZE },
+
+		/* central security unit */
+		{ Board::CSU_BASE, Board::CSU_SIZE },
 	};
 	return i < sizeof(_regions)/sizeof(_regions[0]) ? &_regions[i] : 0;
 }
diff --git a/repos/base-hw/src/core/imx53/trustzone/trustzone.cc b/repos/base-hw/src/core/imx53/trustzone/trustzone.cc
index 562c87e671..b98fd1e570 100644
--- a/repos/base-hw/src/core/imx53/trustzone/trustzone.cc
+++ b/repos/base-hw/src/core/imx53/trustzone/trustzone.cc
@@ -49,5 +49,5 @@ void Kernel::init_trustzone(Pic * pic)
 	}
 
 	/* configure central security unit */
-	Genode::Csu csu(0x63f9c000);
+	Genode::Csu csu(Imx53::Board::CSU_BASE);
 }
diff --git a/repos/base/include/platform/imx53/drivers/board_base.h b/repos/base/include/platform/imx53/drivers/board_base.h
index ab32561934..82b0025fae 100644
--- a/repos/base/include/platform/imx53/drivers/board_base.h
+++ b/repos/base/include/platform/imx53/drivers/board_base.h
@@ -103,6 +103,9 @@ namespace Genode
 			IIM_BASE           = 0x63f98000,
 			IIM_SIZE           = 0x00004000,
 
+			CSU_BASE           = 0x63f9c000,
+			CSU_SIZE           = 0x00001000,
+
 			M4IF_BASE          = 0x63fd8000,
 			M4IF_SIZE          = 0x00001000,