add 'yocto-layer-example'

This is a first attemp to create a new slideset for day2 of yocto-trainig.

The slideset is based on 'yocto-advanced' but with integration of
'meta-schulung' explanations.

I used a slightly modified version of 'meta-schulung'. The following changes
are currently not available in git:

I don't use linux-yocto in meta-schulung, but use an own kernel-recipe and
integrate the RT-PREEMPT patch.

wic: i can't see the need for the second partition and the need for huge files
in the kconfig. It works for me by adding ' --align 1024 ' to the wic setup.
I decided to use ext2 instead of ext4.

I renamed the rootfs.bb file into schulung-base.bb

I use the u-boot recipe from poky. However i don't use u-boot for anything atm.
  But bootloader is on our agenda..

Signed-off-by: Manuel Traut <manut@linutronix.de>

1 files changed, 58 insertions, 0 deletions

diff --git a/distribution/yocto-example-layer/tcf-agent.tex b/distribution/yocto-example-layer/tcf-agent.tex
new file mode 100644
index 0000000..a70b506
--- /dev/null
+++ b/distribution/yocto-example-layer/tcf-agent.tex
@@ -0,0 +1,58 @@
+\subsection{Remote Debugging}
+\begin{frame}
+\frametitle{Workflow}
+\begin{itemize}
+\item Introduce 'SCHULUNG\_FEATURES' variable
+\item Check feature variable in image recipe
+\item Use debugging tools from poky layer
+\end{itemize}
+\end{frame}
+
+\begin{frame}[fragile]
+\frametitle{Extend image recipe}
+\begin{lstlisting}
+$ cd ~/poky/meta-schulung
+$ pluma recipes-core/image/core-image-schulung.bb
+\end{lstlisting}
+\begin{verbatim}
+[..]
+DEVPKGS = "gdbserver tcf-agent procps strace"
+CORE_IMAGE_BASE_INSTALL = " \
+ schulung-base \
+ kernel-modules \
+ example \
+ ${@bb.utils.contains('SCHULUNG_FEATURES','devel','${DEVPKGS}','', d)} \
+"
+[..]
+\end{verbatim}
+\end{frame}
+
+\begin{frame}[fragile]
+\frametitle{Define SCHULUNG\_FEATURES and rebuild image}
+\begin{lstlisting}
+$ cd ~/poky/build-schulung
+$ pluma conf/local.conf
+\end{lstlisting}
+\begin{verbatim}
+#STATE_DIR ?= "/home/prebuilt/vexpress/sstate-cache"
+#BB_NO_NETWORK = "1"
+MACHINE ??= "vexpress"
+DL_DIR ?= "/home/downloads"
+DISTRO ?= "schulung"
+PACKAGE_CLASSES ?= "package_ipk"
+EXTRA_IMAGE_FEATURES ?= "debug-tweaks"
+SCHULUNG_FEATURES = "devel"
+USER_CLASSES ?= "buildstats image-mklibs image-prelink"
+PATCHRESOLVE = "noop"
+CONF_VERSION = "1"
+\end{verbatim}
+\begin{lstlisting}
+$ bitbake core-image-schulung
+$ bitbake -c populate_sdk core-image-schulung
+\end{lstlisting}
+If image is started in qemu tcf-agent needs to be started manually:
+\begin{lstlisting}
+Please press Enter to activate this console.
+/ # /etc/init.d/tcf-agent start
+\end{lstlisting}
+\end{frame}