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How to change RTC device

HI.

 

I have developed a board based on the EZSDK.(linux-2.6.37-psp04.04.00.01).

 Its board has implemented the DM8168.

 

I want to change rtc device to RX8025.

So I have changed .config file "#CONFIG_RTC_DRV_DS1307 is not set" and "CONFIG_RTC_RX8025=y".

But command ack of "date" is " 2011/6/30".

On uboot I could set today date and get "2012/7/31".

Other changes required?