diff --git a/include/plat/arm/common/arm_def.h b/include/plat/arm/common/arm_def.h
index ab0e4ff..36b1bdb 100644
--- a/include/plat/arm/common/arm_def.h
+++ b/include/plat/arm/common/arm_def.h
@@ -20,10 +20,12 @@
  *****************************************************************************/
 
 /*
- * Root of trust key hash lengths
+ * Root of trust key lengths
  */
 #define ARM_ROTPK_HEADER_LEN		19
 #define ARM_ROTPK_HASH_LEN		32
+/* ARM_ROTPK_KEY_LEN includes DER header + raw key material */
+#define ARM_ROTPK_KEY_LEN		294
 
 /* Special value used to verify platform parameters from BL2 to BL31 */
 #define ARM_BL31_PLAT_PARAM_VAL		ULL(0x0f1e2d3c4b5a6978)
diff --git a/include/plat/arm/common/plat_arm.h b/include/plat/arm/common/plat_arm.h
index 6c0d91d..494e470 100644
--- a/include/plat/arm/common/plat_arm.h
+++ b/include/plat/arm/common/plat_arm.h
@@ -159,7 +159,7 @@
 #define ARM_ROTPK_REGS_ID		1
 #define ARM_ROTPK_DEVEL_RSA_ID		2
 #define ARM_ROTPK_DEVEL_ECDSA_ID	3
-
+#define ARM_ROTPK_DEVEL_FULL_DEV_RSA_KEY_ID	4
 
 /* IO storage utility functions */
 int arm_io_setup(void);