Reboot property to control system reboot on PPC4xx systems:
By setting "reset_type" to one of the following values, the default
software reset mechanism may be overridden. Here the possible values of
"reset_type":
1 - PPC4xx core reset
2 - PPC4xx chip reset
3 - PPC4xx system reset (default)
Example:
cpu@0 {
device_type = "cpu";
model = "PowerPC,440SPe";
...
reset-type = <2>; /* Use chip-reset */
};