建立工程，成功创建两个虚拟串口

source/OpenAMP/libmetal/lib/system/freertos/template/sys.c

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+/*
+ * Copyright (c) 2018, Linaro Inc. and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * @file	generic/template/sys.c
+ * @brief	machine specific system primitives implementation.
+ */
+
+#include <metal/io.h>
+#include <metal/sys.h>
+#include <metal/utilities.h>
+#include <stdint.h>
+
+void sys_irq_restore_enable(unsigned int flags)
+{
+	metal_unused(flags);
+	/* Add implementation here */
+}
+
+unsigned int sys_irq_save_disable(void)
+{
+	return 0;
+	/* Add implementation here */
+}
+
+void sys_irq_enable(unsigned int vector)
+{
+	metal_unused(vector);
+
+	/* Add implementation here */
+}
+
+void sys_irq_disable(unsigned int vector)
+{
+	metal_unused(vector);
+
+	/* Add implementation here */
+}
+
+void metal_machine_cache_flush(void *addr, unsigned int len)
+{
+	metal_unused(addr);
+	metal_unused(len);
+
+	/* Add implementation here */
+}
+
+void metal_machine_cache_invalidate(void *addr, unsigned int len)
+{
+	metal_unused(addr);
+	metal_unused(len);
+
+	/* Add implementation here */
+}
+
+void metal_generic_default_poll(void)
+{
+	/* Add implementation here */
+}
+
+void *metal_machine_io_mem_map(void *va, metal_phys_addr_t pa,
+			       size_t size, unsigned int flags)
+{
+	metal_unused(pa);
+	metal_unused(size);
+	metal_unused(flags);
+
+	/* Add implementation here */
+
+	return va;
+}