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+\subsubsection{Pseudofs sysfs}
+% ----------------------------
+\begin{frame}
+\frametitle{Basics}
+\begin{itemize}
+\item externalize kernel objects
+\item mount-point: /sys
+\item early mount required
+\item Kernel devices
+ \begin{itemize}
+ \item /sys/devices: all devices
+ \item /sys/block: only block devices
+ \item /sys/bus: devices, sorted by bus
+ \item /sys/class: devices, sorted by class
+ \end{itemize}
+\item Kernel modules
+ \begin{itemize}
+ \item /sys/module: all modules
+ \item module parameters
+ \item module properties
+ \end{itemize}
+\item Tooling support:
+ \begin{itemize}
+ \item bus tools: lspci, lsusb, etc
+ \item others: lsuio
+ \end{itemize}
+\end{itemize}
+\end{frame}
+% The pseudo filesystem sys provices access to all kernel objects like
+% devices, drivers and modules. The subdirectories sorts a subset of kernel
+% objects accoding to different criteria, like bus, class, and so on.
+
+% ----------------------------
+\subsubsection*{}
+\begin{frame}
+\frametitle{Resources}
+\begin{itemize}
+\item \href{https://www.kernel.org/doc/Documentation/filesystems/sysfs.txt}{Kernel: Documentation/filesystems/sysfs.txt}
+\item \href{http://man7.org/linux/man-pages/man5/sysfs.5.html}{man 5 sysfs}
+\end{itemize}
+\end{frame}