Wei-PowerControl - Enter power-down mode, but couldn't wake it up us…

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Enter power-down mode, but couldn't wake it up using an interrupt from a real time clock (RTC) interrupt

Changes

Revision	Date	Who	Commit message
1:635eaebcd13f	2016-02-22	weidongguo	1)Power down most peripherals except for GPIO for LEDs and UART0 for serial port communication. 2) Can enter sleep mode and be waken by a RTC interrupt every minute after the first 5 seconds default tip
0:35c76e921818	2016-02-18	weidongguo	enter power-down mode, and attempt to wake the board up from a real time clock (RTC) interrupt, but didn't succeed yet.