#SYSTEM_VERSION
  the version of the system
        Example: SYSTEM_VERSION="3.0.0"

#SYSTEM_NAME
  the name of the system

#HOST_NAME
  the name of the system in the network envioment

ADDON_CLASS
  addon class for the online installation of addons (stable, devel, all)

#APM_WGET_ARGS
  arguments to use for the call of wget

#LOG_LEVEL
  log level and kernel logging (0=deactivate logging, 1=activate logging, 2=extended messages on the console, 3-8=kernel logging)

#SHOW_PROMPT
  should the prompt shown on startup