diff --git a/components/libc/newlib/libc.c b/components/libc/newlib/libc.c
new file mode 100644
index 0000000000000000000000000000000000000000..1f8d7221f02041d3e6fbca2b996bea1f576b15f9
--- /dev/null
+++ b/components/libc/newlib/libc.c
@@ -0,0 +1,20 @@
+#include <rtthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+
+void libc_system_init(const char* tty_name)
+{
+	int fd;
+
+	/* init console device */
+	rt_console_init(tty_name);
+
+	/* open console as stdin/stdout/stderr */
+	fd = open("/dev/console", O_RDONLY, 0);	/* for stdin */
+	rt_kprintf("stdin: %d\n", fd);
+	fd = open("/dev/console", O_WRONLY, 0);	/* for stdout */
+	rt_kprintf("stdout: %d\n", fd);
+	fd = open("/dev/console", O_WRONLY, 0);	/* for stderr */
+	rt_kprintf("stderr: %d\n", fd);
+}
diff --git a/components/libc/newlib/libc.h b/components/libc/newlib/libc.h
new file mode 100644
index 0000000000000000000000000000000000000000..b21a7264b385cc465b3dd8b192cd04fe05adbabb
--- /dev/null
+++ b/components/libc/newlib/libc.h
@@ -0,0 +1,6 @@
+#ifndef __RTT_LIBC_H__
+#define __RTT_LIBC_H__
+
+void libc_system_init(const char* tty_name);
+
+#endif
diff --git a/components/libc/newlib/syscalls.c b/components/libc/newlib/syscalls.c
index 3625f2d23426bd265ce20f37f5be35ea5200c038..93d96fe16586b4bde64c5b9e80806ae651b10a5f 100644
--- a/components/libc/newlib/syscalls.c
+++ b/components/libc/newlib/syscalls.c
@@ -51,6 +51,8 @@ _getpid_r(struct _reent *ptr)
 int
 _isatty_r(struct _reent *ptr, int fd)
 {
+	if (fd >=0 && fd < 3) return 1;
+
 	/* return "not supported" */
 	ptr->_errno = ENOTSUP;
 	return -1;
@@ -198,3 +200,18 @@ _free_r (struct _reent *ptr, void *addr)
 {
 	rt_free (addr);
 }
+
+#ifdef RT_USING_FINSH
+#include <finsh.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+void nltest()
+{
+	printf("stdout test!!\n");
+	fprintf(stdout, "fprintf test!!\n");
+	fprintf(stderr, "fprintf test!!\n");
+}
+FINSH_FUNCTION_EXPORT(nltest, newlib test);
+#endif
+