建立工程，成功创建两个虚拟串口

source/OpenAMP/libmetal/lib/system/linux/cache.h

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+/*
+ * Copyright (c) 2018, Linaro Limited. and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * @file	linux/cache.h
+ * @brief	Linux cache operation primitives for libmetal.
+ */
+
+#ifndef __METAL_CACHE__H__
+#error "Include metal/cache.h instead of metal/linux/cache.h"
+#endif
+
+#ifndef __METAL_LINUX_CACHE__H__
+#define __METAL_LINUX_CACHE__H__
+
+#include <metal/utilities.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static inline void __metal_cache_flush(void *addr, unsigned int len)
+{
+	/** Do nothing.
+	 *  Do not flush cache from Linux userspace.
+	 */
+	metal_unused(addr);
+	metal_unused(len);
+	return;
+}
+
+static inline void __metal_cache_invalidate(void *addr, unsigned int len)
+{
+	/** Do nothing.
+	 *  Do not flush cache from Linux userspace.
+	 */
+	metal_unused(addr);
+	metal_unused(len);
+	return;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __METAL_LINUX_CACHE__H__ */