docs: add troubleshooting notes to establish-serial-connection.rst

docs/en/get-started/establish-serial-connection.rst

@@ -276,12 +276,26 @@ Run terminal and set identified serial port. Baud rate = 115200 (if needed, chan
 
     Setting Serial Communication in PuTTY on Linux
 
-Then open serial port in terminal and check, if you see any log printed out by {IDF_TARGET_NAME}. The log contents depend on application loaded to {IDF_TARGET_NAME}, see `Example Output`_.
+Then open serial port in terminal and check, if you see any log printed out by {IDF_TARGET_NAME}. The log contents depend on application loaded to {IDF_TARGET_NAME}, see `Example Output`_. Reset the board if no log has been printed out.
 
 .. note::
 
    Close the serial terminal after verification that communication is working. If you keep the terminal session open, the serial port will be inaccessible for uploading firmware later.
 
+.. note::
+
+   If there is no log output, check
+
+   - if the required power is supplied to {IDF_TARGET_NAME}
+   - if the board was reset after starting the terminal program
+   - if the selected serial port is the correct one by using the method stated in `Check Port on Windows`_ and `Check Port on Linux and macOS`_
+   - if the serial port is not being used by another program
+   - if the identified port has been selected in serial terminal programs you are using, as stated in `Windows and Linux`_
+   - if settings of the serial port in serial terminal programs are applicable to corresponding applications
+   - if the correct USB connector (UART) is used on the development board
+   - if your application is expected to output some log
+   - if the log output has not been disabled (use :example:`hello world application <get-started/hello_world>` to test)
+
 macOS
 ^^^^^
 

docs/zh_CN/get-started/establish-serial-connection.rst

@@ -276,12 +276,26 @@ Windows 和 Linux 操作系统
 
     在 Linux 操作系统中使用 PuTTY 设置串口通信参数
 
-然后，请检查 {IDF_TARGET_NAME} 是否有打印日志。如有，请在终端打开串口进行查看。这里的日志内容取决于加载到 {IDF_TARGET_NAME} 的应用程序，请参考 `输出示例`_。
+然后，请检查 {IDF_TARGET_NAME} 是否有打印日志。如有，请在终端打开串口进行查看。这里的日志内容取决于加载到 {IDF_TARGET_NAME} 的应用程序，请参考 `输出示例`_。如果没有看到输出日志，请尝试重启开发板。
 
 .. 注解::
 
    请在验证完串口通信正常后，关闭串口终端。如果终端一直保持打开的状态，之后上传固件时将无法访问串口。
 
+.. 注解::
+
+   如果没有日志输出，请检查以下原因：
+
+   - {IDF_TARGET_NAME} 的供电是否正常
+   - 启动终端程序后，是否重置开发板
+   - 使用 `在 Windows 上查看端口`_ 与 `在 Linux 和 macOS 上查看端口`_ 中描述的方法，检查所选串口是否正确
+   - 其他程序是否正在使用该串口
+   - 对于 `Windows 和 Linux 操作系统`_ 中描述的串口终端程序，其选择的端口是否正确
+   - 串口终端程序中的串口设置是否适用于该应用程序
+   - 开发板上选择的 USB 连接器（UART）是否正确
+   - 应用程序是否会输出日志
+   - 是否禁用了日志输出（使用 :example:`hello world 示例 <get-started/hello_world>` 进行测试）
+
 macOS 操作系统
 ^^^^^^^^^^^^^^^^^