\subsection{Define a distribution}
\begin{frame}
\frametitle{why define a distribution?}
\begin{itemize}
\item naming of the toolchain (codenames, vendor)
\item version numbers
\item enable default features
\end{itemize}
\end{frame}

\begin{frame}
\frametitle{distro features: file-systems}
\begin{description}
\item[cramfs] CramFS support
\item[ext2] tools for supporting for devices with internal HDD/Microdrive
        for storing files (instead of Flash only devices)
\item[nfs] NFS client support (for mounting NFS exports on device)
\item[smbfs] SMB networks client support
        (for mounting Samba/Microsoft Windows shares on device)
\end{description}
\end{frame}

\begin{frame}
\frametitle{distro features: hardware support}
\begin{description}
\item[alsa] ALSA/sound support
        (OSS compatibility kernel modules installed if available)
\item[bluetooth] bluetooth support (integrated BT only)
\item[irda] IrDA support
\item[wifi] WiFi support (integrated only).
\item[keyboard] keyboard support (e.g. keymaps will be loaded during boot)
\end{description}
\end{frame}

\begin{frame}
\frametitle{distro features: grahpics}
\begin{description}
\item[opengl] the Open Graphics Library, which is a cross-language,
        multi-platform application programming interface used for rendering two
        and three-dimensional graphics
\item[directfb] DirectFB support
\end{description}
\end{frame}

\begin{frame}
\frametitle{distro features: networking}
\begin{description}
\item[ipsec] IPSec support
\item[ipv6] IPv6 support
\item[ppp] PPP dialup support
\end{description}
\end{frame}

\begin{frame}
\frametitle{distro features: bus support}
\begin{description}
\item[pci] PCI bus support
\item[pcmcia] PCMCIA/CompactFlash support
\item[usbgadget] USB Gadget Device support (for USB networking/serial/storage)
\item[usbhost] USB Host support
        (allows to connect external keyboard, mouse, storage, network etc)
\end{description}
\end{frame}

\begin{frame}
\frametitle{distro features: software}
\begin{description}
\item[systemd] support for this init manager, which is a full replacement of
        for init with parallel starting of services, reduced shell overhead,
        and other features. This init manager is used by many distributions
\item[wayland] the Wayland display server protocol
        and the library that supports it
\item[x11] X server and libraries
\end{description}
\end{frame}

\begin{frame}[fragile]
\frametitle{use a DISTRO\_FEATURE}
Normally the distro features are used in package groups in a core layer.
e.g. 'meta/recipes-core/packagegroups/packagegroup-base.bb':
\begin{verbatim}
PACKAGES = ' \
     ..
     ${@base_contains("DISTRO_FEATURES", \
                      "opengl", "packagegroup-opengl", "", d)} \
     ..
     '
\end{verbatim}
\end{frame}

\begin{frame}[fragile]
\frametitle{Yocto with local mirror}
\begin{description}
\item [PREMIRRORS] list of mirrors that are tried before SRC\_URI
\item [MIRRORS] list of mirrors that are tried after SRC\_URI
\item [BB\_FETCH\_PREMIRRORONLY = "1"] only use sources from PREMIRRORS
\item [BB\_NO\_NETWORK = "1"] throws error instead of accessing internet
\end{description}
typical in local.conf to generate the mirror:
\begin{description}
\item [BB\_GENERATE\_MIRROR\_TARBALLS = "1"] generates a tarball that can be
  used as mirror
\end{description}
\end{frame}