diff --git a/tests/drivers/uart/uart_async_api/boards/mimxrt1064_evk.conf b/tests/drivers/uart/uart_async_api/boards/mimxrt1064_evk.conf
new file mode 100644
index 000000000000000..5f2a8070c8948a5
--- /dev/null
+++ b/tests/drivers/uart/uart_async_api/boards/mimxrt1064_evk.conf
@@ -0,0 +1,2 @@
+# Userspace is unable to access the nocache region.
+CONFIG_USERSPACE=n
diff --git a/tests/drivers/uart/uart_async_api/boards/mimxrt1064_evk.overlay b/tests/drivers/uart/uart_async_api/boards/mimxrt1064_evk.overlay
index 1a0c35e198aa765..22ecfdfa712aea9 100644
--- a/tests/drivers/uart/uart_async_api/boards/mimxrt1064_evk.overlay
+++ b/tests/drivers/uart/uart_async_api/boards/mimxrt1064_evk.overlay
@@ -1,11 +1,5 @@
 /* SPDX-License-Identifier: Apache-2.0 */
 
-/ {
-	chosen {
-		zephyr,sram = &dtcm;
-	};
-};
-
 dut: &lpuart3 {
 	status = "okay";
 	current-speed = <115200>;