fix

STM32MP157/doc_pic/09_UART/05_a_在STM32MP157上做串口实验的准备工作.md

@@ -77,13 +77,13 @@ doc_and_source_for_drivers\STM32MP157\source\A7\09_UART\00_stm32mp157_devicetree
 
 观察STM32MP157的扩展板，背后写着: UART8_TX, UART8_RX，如下图：
 
-![image-20210719092503508](../../../IMX6ULL/doc_pic/09_UART/pic/09_UART/19_stm32mp157_extend_board_back.png)
+![image-20210719092503508](pic/09_UART/19_stm32mp157_extend_board_back.png)
 
 
 
 打开STM32MP157底板原理图，可知UART8_TX、UART8_RX使用引脚PE1、PE0，如下图：
 
-![image-20210719092726986](../../../IMX6ULL/doc_pic/09_UART/pic/09_UART/20_stm32mp157_pins_of_uart8.png)
+![image-20210719092726986](pic/09_UART/20_stm32mp157_pins_of_uart8.png)
 
 
 
@@ -91,7 +91,7 @@ doc_and_source_for_drivers\STM32MP157\source\A7\09_UART\00_stm32mp157_devicetree
 
 在STM32MP157的内核设备树文件`arch/arm/boot/dts/stm32mp151.dtsi`中，已经设置了uart8节点：
 
-![image-20210719092138173](C:/Users/weidongshan/AppData/Roaming/Typora/typora-user-images/image-20210719092138173.png)
+![image-20210719092138173](pic/09_UART/22_stm32mp157_uart8_node.png)
 
 我们需要使能这个节点，往下看。
 
@@ -114,7 +114,7 @@ doc_and_source_for_drivers\STM32MP157\source\A7\09_UART\00_stm32mp157_devicetree
 
 这些Pinctrl信息已经在`arm/boot/dts/stm32mp157-100ask-pinctrl.dtsi`中有了，无需我们添加：
 
-![image-20210719092949939](../../../IMX6ULL/doc_pic/09_UART/pic/09_UART/21_stm32mp157_uart8_pinctrl.png)
+![image-20210719092949939](pic/09_UART/21_stm32mp157_uart8_pinctrl.png)