CRS can be configured to either to restart or not to restart on reboots. Disable restarts would be typically useful for troubleshooting CRS reboots or validating any system level changes.
To enable restarts (default):
$CRS_HOME/bin/crsctl enable crs
To disable restarts of crs on reboots:
$CRS_HOME/bin/crsctl disable crs
Note that the above needs access to root.
Whenever the above commands are run, it modifies the following file (on linux), which indicates whether or not the CRS is set to auto-restart on reboots:
It contains either "enable" or "disable" keywords.