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% ----------------------------
\section{Update Concepts}
\subsection{Introduction}
% ----------------------------
\begin{frame}{General}
\begin{itemize}
\item Why are updates necessary?
\begin{itemize}
\item Functionality (new features)
\item Up-to-date (problem fixes, configuration)
\item Root-of-trust (Certificates et.al.)
\end{itemize}
\item Common Issues with Updates:
\begin{itemize}
\item Reduced Resources
\item Unreliable Communication
\item Failed or Incomplete Updates
\item Integrity of Updates
\item No "One-size-fits-all"-Solution
\end{itemize}
\item Update concepts are mandatory for Embedded Systems!
\end{itemize}
\end{frame}
% ----------------------------
\begin{frame}{General Requirements}
\begin{itemize}
\item Security
\begin{itemize}
\item Ensure Update Integrity
\item Prevent Malicious Code Injection
\item Usage of Encryption Standards
\end{itemize}
\item Reliability
\begin{itemize}
\item Handle failed or incomplete Updates
\end{itemize}
\item Flexibility
\begin{itemize}
\item Adaptable to changing Needs
\item Adaptable to Target Requirements
\item Adaptable to System Environment
\end{itemize}
\item Scalability
\begin{itemize}
\item Number of Targets
\item Target Size
\item Target Connectivity
\end{itemize}
\end{itemize}
\end{frame}
% ----------------------------
\subsection{Redundant System}
% ----------------------------
\begin{frame}{Overview}
\begin{center}
\includegraphics[height=0.7\textheight]{images/update_redundant_overview.png}
\end{center}
\end{frame}
% ----------------------------
\begin{frame}{Process Update}
\begin{center}
\includegraphics[width=5cm]{images/update_redundant_upd_process.png}
\end{center}
\end{frame}
% ----------------------------
\begin{frame}{Confirm Update}
\begin{center}
\includegraphics[width=5cm]{images/update_redundant_upd_confirm.png}
\end{center}
\end{frame}
% ----------------------------
\begin{frame}{Features}
\begin{itemize}
\item Always working (and updateable) System
\item Single Root-Filesystem Layout
\item Single Reboot per Update
\item Pros:
\begin{itemize}
\item Fallback: Production Environment
\item only one Reboot per Update required
\item better Integration with Application
\end{itemize}
\item Cons:
\begin{itemize}
\item Space Requirements
\end{itemize}
\end{itemize}
\end{frame}
% ----------------------------
\subsection{Rescue System}
% ----------------------------
\begin{frame}{Overview}
\begin{center}
\includegraphics[height=0.7\textheight]{images/update_rescue_overview.png}
\end{center}
\end{frame}
% ----------------------------
\begin{frame}{Prepare Update}
\begin{center}
\includegraphics[width=5cm]{images/update_rescue_upd_prepare.png}
\end{center}
\end{frame}
% ----------------------------
\begin{frame}{Process Update}
\begin{center}
\includegraphics[width=5cm]{images/update_rescue_upd_process.png}
\end{center}
\end{frame}
% ----------------------------
\begin{frame}{Confirm Update}
\begin{center}
\includegraphics[width=5cm]{images/update_rescue_upd_confirm.png}
\end{center}
\end{frame}
% ----------------------------
\begin{frame}{Features}
\begin{itemize}
\item Always updateable System
\item Separate Root-Filesystem Layout
\item Full Linux functionality (NAND, USB, WiFi, etc) for Rescue
\item Pros:
\begin{itemize}
\item Space Requirements
\item Restricted HW Access in (connected) Production System
\item Full HW Access in (disconnected) Rescue System
\end{itemize}
\item Cons.:
\begin{itemize}
\item two Reboots per Update
\item no/reduced Application Support during Update
\item no Fallback to working System
\end{itemize}
\end{itemize}
\end{frame}
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