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RTC

To set the RTC first set the date from Linux shell, type:

# date --set="20150225 09:04"

Then set the real time clock from Linux shell, type:

# hwclock --systohc --utc

Power down your board wait 5 minutes and power up.
Set the system time according to external RTC chip:

#  hwclock -s

Check your system with date and the time should be up to date.