====== Boot Process ======

This boot process is universal to all PROXmobil3 units as best as I can surmise.

1. U-Boot starts up and loads the kernel from the [[storage#rootfs|rootFS]] microSD card.\\
2. The kernel loads systemd from /usr/lib/systemd/systemd.\\
3. systemd attempts to mount the [[storage#initFS|initFS]] by searching for any partitions named ''%%init%%''. If it cannot find any volumes after 90 seconds, it shuts down.\\
4. The kernel calls to /sbin/init, which later calls ''%%/init/tools/initexec.sh startup%%''. If the ''%%startup%%'' argument is not passed, the script tells you the only valid argument is ''%%startup%%'', then exits.\\
5a. /init/tools/initexec.sh sets up a bunch of aliases and environment variables.\\
5b. initexec.sh ensures necessary directories are created, then checks and sets the device's distribution channel.\\
5c. It calls a function ''%%do_startup%%'', which checks if there is software to run, and if not, installs it via a function ''%%install_archive%%''. This function misspells "archive" to "archvie" in an echo log.\\
5d. It checks if ''%%/init/tmp/reboot.flg exists%%'', and if so, reboots the device.\\
5e. It calls every script located in /init/autorun/, launching /efad/pgm/NxProx (the CapMetro software), then echoes "Startup completed".software).\\

It is trivially easy to hijack this init sequence by modifying initexec.sh or just inserting a script into /init/autorun.