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use 65910 as the clock source of am3359

Other Parts Discussed in Thread: AM3359

Hi, 

 I see that AM335x evaluation board uses RTC crystal connected to the Processor. But when the power is off there is no backup power to the RTC domain and the time and date contents cannot be actively incremented. It will remain at the old place only after power on.

so we want to use 65910 as the clock source of am3359, but after changed, the MLO can't start up successfully. no print log from uart.

if I del  the function evm.c->s_init()->rtc32k_enable(); the MLO can start up successfully

both our board and  AM335x evaluation board uses external RTC clock, why our board should del  the function evm.c->s_init()->rtc32k_enable();