Set system time from RTC on startup and resume

modulename: hctosys.ko

configname: CONFIG_RTC_HCTOSYS

Linux Kernel Configuration
└─>Device Drivers
└─>Real Time Clock
└─>Set system time from RTC on startup and resume
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
If you say yes here, the system time (wall clock) will be set using
the value read from a specified RTC device. This is useful to avoid
unnecessary fsck runs at boot time, and to network better.

source code: