Introduces how to use rtc-cmos, a new extension driver of pocopico related to starting power reservation in m shell.   apollolake (DS918+) / geminilake (DS920+) / v1000 (DS1621+) These three platform-based models cannot start power reservation because the /dev/rtc0 device is not active.   rtc-cmos of pocopico activates /dev/rtc0 device and enables setting of alarm time related to power reservation start.   The rtc-cmos extension driver is automatically bundl