diff --git a/plat/st/stm32mp1/bl2_plat_setup.c b/plat/st/stm32mp1/bl2_plat_setup.c
index 13ba5ab..a5a4c1c 100644
--- a/plat/st/stm32mp1/bl2_plat_setup.c
+++ b/plat/st/stm32mp1/bl2_plat_setup.c
@@ -333,11 +333,14 @@
 
 	stm32_iwdg_refresh();
 
-	stm32mp1_auth_ops.check_key = boot_context->bootrom_ecdsa_check_key;
-	stm32mp1_auth_ops.verify_signature =
-		boot_context->bootrom_ecdsa_verify_signature;
+	if (stm32mp_is_auth_supported()) {
+		stm32mp1_auth_ops.check_key =
+			boot_context->bootrom_ecdsa_check_key;
+		stm32mp1_auth_ops.verify_signature =
+			boot_context->bootrom_ecdsa_verify_signature;
 
-	stm32mp_init_auth(&stm32mp1_auth_ops);
+		stm32mp_init_auth(&stm32mp1_auth_ops);
+	}
 
 	stm32mp1_arch_security_setup();
 
diff --git a/plat/st/stm32mp1/stm32mp1_private.c b/plat/st/stm32mp1/stm32mp1_private.c
index 075d1d7..5156975 100644
--- a/plat/st/stm32mp1/stm32mp1_private.c
+++ b/plat/st/stm32mp1/stm32mp1_private.c
@@ -443,6 +443,27 @@
 	return (value & CFG0_CLOSED_DEVICE) == CFG0_CLOSED_DEVICE;
 }
 
+/* Return true when device supports secure boot */
+bool stm32mp_is_auth_supported(void)
+{
+	bool supported = false;
+
+	switch (get_part_number()) {
+	case STM32MP151C_PART_NB:
+	case STM32MP151F_PART_NB:
+	case STM32MP153C_PART_NB:
+	case STM32MP153F_PART_NB:
+	case STM32MP157C_PART_NB:
+	case STM32MP157F_PART_NB:
+		supported = true;
+		break;
+	default:
+		break;
+	}
+
+	return supported;
+}
+
 uint32_t stm32_iwdg_get_instance(uintptr_t base)
 {
 	switch (base) {