建立工程，成功创建两个虚拟串口

source/rt_thread/libcpu/risc-v/common/cpuport.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2006-2021, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2018-10-03     Bernard      The first version
+ */
+
+#ifndef CPUPORT_H__
+#define CPUPORT_H__
+
+#include <rtconfig.h>
+
+/* bytes of register width  */
+#ifdef ARCH_CPU_64BIT
+#define STORE                   sd
+#define LOAD                    ld
+#define REGBYTES                8
+#else
+#define STORE                   sw
+#define LOAD                    lw
+#define REGBYTES                4
+#endif
+
+#endif