Forum Post: RE: AM335x without 32khz xtal

In board-am335xevm.c, look for the rtc initialization code, try changing am335x_rtc_init. Look for

2050         /*
2051          * Enable the 32K OSc
2052          * TODO: Need a better way to handle this
2053          * Since we want the clock to be running before mmc init
2054          * we need to do it before the rtc probe happens
2055          */
2056         writel(0x48, base + 0x54);

And change the 0x48 to 0x40. If you look in the TRM for the RTC registers, bit 3 of register RTC_OSC_REG selects the clock source for the RTC. 0=internal, 1=external.

Steve K.