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+++ b/README.md
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 [代码编译方法(具体可参考Makefile中的注释)](https://github.com/54shady/kernel_drivers_examples)
 
+[FIQ-Debugger](./debug/fiq_debugger)
+
 [SPI驱动开发](./debug/spi)
 
 [USB驱动和应用开发](./debug/usb)
diff --git a/debug/fiq_debugger/README.md b/debug/fiq_debugger/README.md
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+# FIQ-Debugger
+
+[参考文章:Linux/Android常用调试工具](http://blog.csdn.net/azloong/article/details/45768633)
+
+## 代码实现
+
+参考 kernel/drivers/staging/android/fiq_debugger/fiq_debugger.c
+
+## 内核配置
+
+	CONFIG_FIQ_DEBUGGER                         // 使能fiq debugger
+	CONFIG_FIQ_DEBUGGER_CONSOLE                 // fiq debugger与console可以互相切换
+	CONFIG_FIQ_DEBUGGER_CONSOLE_DEFAULT_ENABLE  // 启动时默认串口在console模式
+
+## 进入FIQ Debugger
+
+使用minicom进入FIQ Debug mode
+(在RK3399上按完ctrl+a+f后还要按fiq才能进入debug模式,在函数fiq_debugger_handle_uart_interrupt中设置的)
+
+	ctrl+a+z+f 或 ctrl+a+f
+
+退出debug模式
+
+	输入console
+
+## Process/Thread状态
+
+    "R (running)",  /*   0 */
+    "S (sleeping)",  /*   1 */
+    "D (disk sleep)", /*   2 */
+    "T (stopped)",  /*   4 */
+    "t (tracing stop)", /*   8 */
+    "Z (zombie)",  /*  16 */
+    "X (dead)",  /*  32 */
+    "x (dead)",  /*  64 */
+    "K (wakekill)",  /* 128 */
+    "W (waking)",  /* 256 */
+
+通常一般的Process处于的状态都是S(sleeping)，而如果一旦发现处于如D(disk sleep)、T(stopped)、Z(zombie)等就要认真审查