readme ++

README.md

@@ -1,6 +1,6 @@
 # Linux Kernel Module Cheat
 
-Run one command, get into QEMU Buildroot BusyBox with several minimal Linux kernel 4.9 module example tutorials. Tested in Ubuntu 14.04 host.
+Run one command, get into QEMU Buildroot BusyBox with several minimal Linux kernel 4.9 module example tutorials. Tested in Ubuntu 14.04 - 16.10 hosts.
 
 Usage:
 
@@ -17,6 +17,15 @@ QEMU opens up, and you can run:
     rmmod hello
     rmmod hello2
 
+This should print to the screen:
+
+    hello init
+    hello2 init
+    hello cleanup
+    hello2 cleanup
+
+which are `printk` messages from `init` and `cleanup` methods of those modules.
+
 Each module comes from a C file under `kernel_module/`. For module usage do:
 
     head *. use Buildroot's default kernel version, you can confirm it after build with:
@@ -37,11 +46,11 @@ See also: <https://superuser.com/questions/351387/how-to-stop-kernel-messages-fr
 
 ## Debugging
 
-GDB the linux kernel:
+To GDB the Linux kernel, first run:
 
     ./runqemu -d
 
-If you want to break immediately at a symbol, e.g. `start_kernel` of the boot sequence, open another terminal and run for example:
+If you want to break immediately at a symbol, e.g. `start_kernel` of the boot sequence, open another terminal and run:
 
     ./rungdb start_kernel
 
@@ -72,6 +81,8 @@ And now you can control the counting from GDB:
     continue
     continue
 
+See also: <http://stackoverflow.com/questions/11408041/how-to-debug-the-linux-kernel-with-gdb-and-qemu>
+
 ## Text mode
 
 Show serial output of QEMU directly on the current terminal, without opening a QEMU window: