AM335x RTC interface clock malfunctions

Shahal Weissleder

Other Parts Discussed in Thread: AM3354

Dear Community,

I'm trying to run WEC7 on our custom hardware. I managed to run xldr and eboot, however I'm stuck in oeminit. My system hangs in OAL3XX_RTCInit. After a short examination I figured that the RTC interface clock is malfunctioning. I examined the following registers (addresses):

Reg_name Address Value

CM_RTC_RTC_CLKCTRL (0x44E00800): 00010002.

CM_RTC_CLKSTCTRL (0x44E00804): 00000302.

The first one seem to have an issue ( 0x44E00800 ). It seems like the module stays in a transition mode.

(17-16 bits| IDLEST | 0x1 = Trans : Module is performing transition: wakeup, or sleep, or sleep abortion)

What am I doing wrong? (I'm working with a AM3354 cpu)

Thank you,

Shahal

over 12 years ago

0 DavidVescovi over 12 years ago

Genius 5470 points

You are not giving us enough information. What PMIC are you using?

Are you using the RTC on the PMIC or the native RTC on the 335x? If you are using the native RTC do you have all the hardware supplies and xtals connected correctly?

0 Marlon Jose Masbad over 12 years ago in reply to DavidVescovi

Intellectual 740 points

I would like to up this discussion.

I am also stuck at OAL3XX_RTCInit.

My system hangs up upon the first write to the RTC register which is.

rtc_regs->KICK0R = RTC_K_UNLOCK0;

0 John Reid over 11 years ago in reply to Marlon Jose Masbad

Intellectual 610 points

I had the same issue when we moved to a new hardware design which was designed to use an external RTC (on our PMIC chip over I2C bus). I guess these registers do not work if they don't have the RTC clock going in to the module perhaps.

Processors

Processors forum

AM335x RTC interface clock malfunctions