arm: add uart echo app

arm/hal/lib/common/xil_hal.h

@@ -0,0 +1,43 @@
+/******************************************************************************
+* Copyright (c) 2009 - 2020 Xilinx, Inc.  All rights reserved.
+* SPDX-License-Identifier: MIT
+******************************************************************************/
+
+/*****************************************************************************/
+/**
+*
+* @file xil_hal.h
+*
+* Contains all the HAL header files.
+*
+* <pre>
+* MODIFICATION HISTORY:
+*
+* Ver   Who  Date	 Changes
+* ----- ---- -------- -------------------------------------------------------
+* 1.00a hbm  07/28/09 Initial release
+*
+* </pre>
+*
+* @note
+*
+******************************************************************************/
+
+#ifndef XIL_HAL_H
+#define XIL_HAL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include "xil_cache.h"
+#include "xil_io.h"
+#include "xil_assert.h"
+#include "xil_exception.h"
+#include "xil_types.h"
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif