tmux: more gentle introduction

Author: cirosantilli

README.adoc

@@ -1300,40 +1300,63 @@ https://unix.stackexchange.com/questions/152738/how-to-split-a-new-window-and-ru
 
 tmux just makes things even more fun by allowing us to see both terminals at once without dragging windows around!
 
+First start `tmux` with:
+
+....
+tmux
+....
+
+Now that you are inside a shell inside tmux, run:
+
 ....
 ./run -du
 ....
 
-Gives two panes:
+Gives splits the terminal into two panes:
 
 * left: usual QEMU
 * right: gdb
 
 and focuses on the GDB pane.
 
-To start again, switch back to the QEMU (`<prefix>-o`) pane, and re-run:
+Now you can navigate with the usual tmux shortcuts:
+
+* switch between the two panes with: `Ctrl-B O`
+* close either pane by killing its terminal with `Ctrl-D` as usual
+
+To start again, switch back to the QEMU pane, kill the emulator, and re-run:
 
 ....
 ./run -du
 ....
 
-This automatically kills the GDB pane.
-
-To quit for good, exit GDB, and quit the right shell with `Ctrl-D`.
+This automatically clears the GDB pane, and starts a new one.
 
 Pass extra GDB arguments with:
 
 ....
 ./run -du -U start_kernel
 ....
 
+See the tmux manual for further details:
+
+....
+man tmux
+....
+
+==== tmux gem5
+
 If you are using gem5 instead of QEMU, `-u` has a different effect: it opens the gem5 terminal instead of the debugger:
 
 ....
 ./run -gu
 ....
 
-If you also want to use the debugger with gem5, you will need to create your own panes or windows, or to see the debugger instead of the terminal:
+If you also want to use the debugger with gem5, you will need to create new terminals as usual.
+
+From inside tmux, you can do that with `Ctrl-B C` or `Ctrl-B %`.
+
+To see the debugger by default instead of the terminal, run:
 
 ....
 ./tmu ./rungdb;./run -dg

configure

@@ -34,6 +34,7 @@ coreutils \
 cpio \
 expect \
 git \
+tmux \
 unzip \
 vinagre \
 wget \