Why I cannot get correct system time from hardware when I reboot my machine in each time?

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Hwclock is an utility which use to query and set the hardware clock. On system booting time, Red Hat Enterprise Linux will execute hwclock command to get current time from hardware and set it to system clock. By default, hwclock will try to access the /dev/rtc device which assumes to be driven by the rtc device driver. If system report an error message similar like "select() to /dev/rtc to wai...

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