diff --git a/IMX6ULL/doc_pic/09_UART/06_TTY驱动程序框架深入分析.tif b/IMX6ULL/doc_pic/09_UART/06_TTY驱动程序框架深入分析.tif
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diff --git a/IMX6ULL/doc_pic/09_UART/08_UART驱动情景分析_注册.md b/IMX6ULL/doc_pic/09_UART/08_UART驱动情景分析_注册.md
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--- /dev/null
+++ b/IMX6ULL/doc_pic/09_UART/08_UART驱动情景分析_注册.md
@@ -0,0 +1,39 @@
+## UART驱动情景分析_注册
+
+参考资料
+
+* 参考代码：
+
+  ```shell
+  硬件相关：
+  drivers/tty/serial/imx.c
+  drivers/tty/serial/stm32-usart.c
+  
+  串口核心层：
+  drivers/tty/serial/serial_core.c
+  
+  TTY层:
+  drivers/tty/tty_io.c
+  ```
+
+  
+
+
+### 1. 情景分析大纲
+
+* 注册过程分析
+* open过程分析
+* read过程分析
+* write过程分析
+
+
+
+### 2. 源码框架回顾
+
+![image-20210722145518292](pic/09_UART/24_tty_driver_level_2.png)
+
+
+
+### 3. 注册过程分析
+
+![image-20210722144332774](pic/09_UART/23_uart_driver_register.png)
\ No newline at end of file
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diff --git a/IMX6ULL/doc_pic/09_UART/pic/09_UART/24_tty_driver_level_2.png b/IMX6ULL/doc_pic/09_UART/pic/09_UART/24_tty_driver_level_2.png
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diff --git a/README.md b/README.md
index a757f5c..bbb50ad 100644
--- a/README.md
+++ b/README.md
@@ -339,7 +339,13 @@ git clone https://e.coding.net/weidongshan/linux/doc_and_source_for_drivers.git
   ```shell
   07_字符设备驱动程序的另一种注册方法
   ```
+  
+* 2021.07.22 发布"UART子系统"
 
+  ```shell
+  08_UART驱动情景分析_注册
+  ```
+  
 ## 6. 联系方式
 
 * 官网：http://www.100ask.net
diff --git a/STM32MP157/doc_pic/09_UART/08_UART驱动情景分析_注册.md b/STM32MP157/doc_pic/09_UART/08_UART驱动情景分析_注册.md
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index 0000000..8079d31
--- /dev/null
+++ b/STM32MP157/doc_pic/09_UART/08_UART驱动情景分析_注册.md
@@ -0,0 +1,39 @@
+## UART驱动情景分析_注册
+
+参考资料
+
+* 参考代码：
+
+  ```shell
+  硬件相关：
+  drivers/tty/serial/imx.c
+  drivers/tty/serial/stm32-usart.c
+  
+  串口核心层：
+  drivers/tty/serial/serial_core.c
+  
+  TTY层:
+  drivers/tty/tty_io.c
+  ```
+
+  
+
+
+### 1. 情景分析大纲
+
+* 注册过程分析
+* open过程分析
+* read过程分析
+* write过程分析
+
+
+
+### 2. 源码框架回顾
+
+![image-20210722145518292](pic/09_UART/24_tty_driver_level_2.png)
+
+
+
+### 3. 注册过程分析
+
+![image-20210722144332774](pic/09_UART/23_uart_driver_register.png)
\ No newline at end of file
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