diff --git a/Platform/Socionext/DeveloperBox/DeveloperBox.dsc b/Platform/Socionext/DeveloperBox/DeveloperBox.dsc
index fc498eb6..4ff5df97 100644
--- a/Platform/Socionext/DeveloperBox/DeveloperBox.dsc
+++ b/Platform/Socionext/DeveloperBox/DeveloperBox.dsc
@@ -76,6 +76,7 @@
   ArmPlatformStackLib|ArmPlatformPkg/Library/ArmPlatformStackLib/ArmPlatformStackLib.inf
   ArmSmcLib|ArmPkg/Library/ArmSmcLib/ArmSmcLib.inf
   ArmGenericTimerCounterLib|ArmPkg/Library/ArmGenericTimerPhyCounterLib/ArmGenericTimerPhyCounterLib.inf
+  OpteeLib|ArmPkg/Library/OpteeLib/OpteeLib.inf
 
   BaseLib|MdePkg/Library/BaseLib/BaseLib.inf
   BmpSupportLib|MdeModulePkg/Library/BaseBmpSupportLib/BaseBmpSupportLib.inf
diff --git a/Silicon/Socionext/SynQuacer/DeviceTree/SynQuacer.dtsi b/Silicon/Socionext/SynQuacer/DeviceTree/SynQuacer.dtsi
index 37d642e4..d6a5f013 100644
--- a/Silicon/Socionext/SynQuacer/DeviceTree/SynQuacer.dtsi
+++ b/Silicon/Socionext/SynQuacer/DeviceTree/SynQuacer.dtsi
@@ -574,6 +574,14 @@
         #address-cells = <1>;
         #size-cells = <0>;
     };
+
+    firmware {
+        optee {
+            compatible = "linaro,optee-tz";
+            method = "smc";
+            status = "disabled";
+        };
+    };
 };
 
 #include "SynQuacerCaches.dtsi"
diff --git a/Silicon/Socionext/SynQuacer/Library/SynQuacerDtbLoaderLib/SynQuacerDtbLoaderLib.c b/Silicon/Socionext/SynQuacer/Library/SynQuacerDtbLoaderLib/SynQuacerDtbLoaderLib.c
index 897d0674..77db30c2 100644
--- a/Silicon/Socionext/SynQuacer/Library/SynQuacerDtbLoaderLib/SynQuacerDtbLoaderLib.c
+++ b/Silicon/Socionext/SynQuacer/Library/SynQuacerDtbLoaderLib/SynQuacerDtbLoaderLib.c
@@ -19,6 +19,7 @@
 #include <Library/DebugLib.h>
 #include <Library/DxeServicesLib.h>
 #include <Library/MemoryAllocationLib.h>
+#include <Library/OpteeLib.h>
 #include <Platform/VarStore.h>
 
 // add enough space for three instances of 'status = "disabled"'
@@ -47,6 +48,29 @@ DisableDtNode (
   }
 }
 
+STATIC
+VOID
+EnableDtNode (
+  IN  VOID                        *Dtb,
+  IN  CONST CHAR8                 *NodePath
+  )
+{
+  INT32                           Node;
+  INT32                           Rc;
+
+  Node = fdt_path_offset (Dtb, NodePath);
+  if (Node < 0) {
+    DEBUG ((DEBUG_ERROR, "%a: failed to locate DT path '%a': %a\n",
+      __FUNCTION__, NodePath, fdt_strerror (Node)));
+    return;
+  }
+  Rc = fdt_setprop_string (Dtb, Node, "status", "okay");
+  if (Rc < 0) {
+    DEBUG ((DEBUG_ERROR, "%a: failed to set status to 'disabled' on '%a': %a\n",
+      __FUNCTION__, NodePath, fdt_strerror (Rc)));
+  }
+}
+
 /**
   Return a pool allocated copy of the DTB image that is appropriate for
   booting the current platform via DT.
@@ -107,6 +131,10 @@ DtPlatformLoadDtb (
     DisableDtNode (CopyDtb, "/sdhci@52300000");
   }
 
+  if (IsOpteePresent()) {
+    EnableDtNode (CopyDtb, "/firmware/optee");
+  }
+
   *Dtb = CopyDtb;
   *DtbSize = CopyDtbSize;
 
diff --git a/Silicon/Socionext/SynQuacer/Library/SynQuacerDtbLoaderLib/SynQuacerDtbLoaderLib.inf b/Silicon/Socionext/SynQuacer/Library/SynQuacerDtbLoaderLib/SynQuacerDtbLoaderLib.inf
index 548d62fd..fd21f7c3 100644
--- a/Silicon/Socionext/SynQuacer/Library/SynQuacerDtbLoaderLib/SynQuacerDtbLoaderLib.inf
+++ b/Silicon/Socionext/SynQuacer/Library/SynQuacerDtbLoaderLib/SynQuacerDtbLoaderLib.inf
@@ -24,6 +24,7 @@
   SynQuacerDtbLoaderLib.c
 
 [Packages]
+  ArmPkg/ArmPkg.dec
   MdePkg/MdePkg.dec
   EmbeddedPkg/EmbeddedPkg.dec
   Silicon/Socionext/SynQuacer/SynQuacer.dec
@@ -34,6 +35,7 @@
   DxeServicesLib
   FdtLib
   MemoryAllocationLib
+  OpteeLib
 
 [Pcd]
   gSynQuacerTokenSpaceGuid.PcdPcieEnableMask