[FE training-materials-updates] yocto: slides: mention the _remove method

[Antoine Ténart]

Repository : git://git.free-electrons.com/training-materials.git
On branch  : master
Link       : http://git.free-electrons.com/training-materials/commit/?id=29e31efcb2c8c78590b98af8ae08b0953b004e90

>---------------------------------------------------------------

commit 29e31efcb2c8c78590b98af8ae08b0953b004e90
Author: Antoine Tenart <antoine.tenart at free-electrons.com>
Date:   Wed Sep 7 12:12:26 2016 +0200

    yocto: slides: mention the _remove method
    
    Signed-off-by: Antoine Tenart <antoine.tenart at free-electrons.com>


>---------------------------------------------------------------

29e31efcb2c8c78590b98af8ae08b0953b004e90
 slides/yocto-advanced/yocto-advanced.tex | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/slides/yocto-advanced/yocto-advanced.tex b/slides/yocto-advanced/yocto-advanced.tex
index 3513acc..639ebc3 100644
--- a/slides/yocto-advanced/yocto-advanced.tex
+++ b/slides/yocto-advanced/yocto-advanced.tex
@@ -40,7 +40,7 @@
 \end{frame}
 
 \begin{frame}
-  \frametitle{Methods and conditions 1/3}
+  \frametitle{Methods and conditions 1/4}
   \begin{itemize}
     \item Append the keyword \code{_append} to a configuration
       variable to add values {\bf after} the ones previously defined
@@ -57,6 +57,18 @@
           adds the folder to the set of paths where files are located
           (in a recipe).
       \end{itemize}
+  \end{itemize}
+\end{frame}
+
+\begin{frame}
+  \frametitle{Methods and conditions 2/4}
+  \begin{itemize}
+    \item Append the keyword \code{_remove} to a configuration
+      variable to remove all occurrences of a value within a
+      configuration variable.
+      \begin{itemize}
+        \item \code{IMAGE_INSTALL_remove = "i2c-tools"}
+      \end{itemize}
     \item Append the machine name to only define a configuration
       variable for a given machine. It tries to match with values from
       \code{MACHINEOVERRIDES} which include \code{MACHINE} and
@@ -70,7 +82,7 @@
 \end{frame}
 
 \begin{frame}
-  \frametitle{Methods and conditions 2/3}
+  \frametitle{Methods and conditions 3/4}
   \begin{itemize}
     \item The previous methods can be combined.
     \item If we define:
@@ -91,7 +103,7 @@
 \end{frame}
 
 \begin{frame}[fragile]
-  \frametitle{Methods and conditions 3/3}
+  \frametitle{Methods and conditions 4/4}
   \begin{itemize}
     \item The most specific variable takes precedence.
     \item Example: