How do I run a DDR memory test in STM32MP by using U-boot?

[DMårt]

I want to test the memory by using U-boot.

I'm reading the DDR memory from 0xC0000000 to 0xE0000000 with the pattern 0xFFFFFFF. But I don't have premision to read the memory. How can I solve this issue?

STM32MP> mtest 0xC0000000 0xE0000000 0xFFFFFFFF
Testing c0000000 ... e0000000:
Iteration:      1

Pattern FFFFFFFF  Writing...            Reading...Iteration:      2

Pattern 00000001  Writing...            E/TC:0   tzc_it_handler:79 TZC permission failure
E/TC:0   dump_fail_filter:420 Permission violation on filter 0
E/TC:0   dump_fail_filter:425 Violation @0xf8803000, non-secure privileged read, AXI ID 4a0
E/TC:0   tzc_it_handler:79 TZC permission failure
E/TC:0   dump_fail_filter:420 Permission violation on filter 0
E/TC:0   dump_fail_filter:425 Violation @0xf8804000, non-secure privileged read, AXI ID 4a0

My U-boot Device Tree for the memory.

	memory@c0000000 {
		device_type = "memory";
		reg = <0xc0000000 0x20000000>;

		/* USER CODE BEGIN memory */
		/* USER CODE END memory */
	};

	reserved-memory {
		#address-cells = <1>;
		#size-cells = <1>;
		ranges;

		/* USER CODE BEGIN reserved-memory */
		optee@de000000 {
			reg = <0xde000000 0x2000000>;
			no-map;
		};
		
		mcuram2:mcuram2@10000000{
			compatible = "shared-dma-pool";
			reg = <0x10000000 0x40000>;
			no-map;
		};

		vdev0vring0:vdev0vring0@10040000{
			compatible = "shared-dma-pool";
			reg = <0x10040000 0x1000>;
			no-map;
		};

		vdev0vring1:vdev0vring1@10041000{
			compatible = "shared-dma-pool";
			reg = <0x10041000 0x1000>;
			no-map;
		};

		vdev0buffer:vdev0buffer@10042000{
			compatible = "shared-dma-pool";
			reg = <0x10042000 0x4000>;
			no-map;
		};

		mcu_rsc_table:mcu-rsc-table@10048000{
			compatible = "shared-dma-pool";
			reg = <0x10048000 0x8000>;
			no-map;
		};

		mcuram:mcuram@30000000{
			compatible = "shared-dma-pool";
			reg = <0x30000000 0x40000>;
			no-map;
		};

		retram:retram@38000000{
			compatible = "shared-dma-pool";
			reg = <0x38000000 0x10000>;
			no-map;
		};
		/* USER CODE END reserved-memory */
	};