AM3352 : RTC clock enable

Smitha R

Other Parts Discussed in Thread: AM3352

Hello,

I'm a newbie dealing with AM3352 custom board and using ti-sdk-am335x-evm-07.00.00.00.
My board has
   * AM3352 processor
   * TPS65217C PMIC
   * IS43TR16128A-125KBLI DDR3

I'm facing problem in booting using SD card. SYSBOOT[4:0] is 10111b. Created SD card using create-sdcard.sh script.

Error message "Clock enable failed for 0x44e00800 idlest 0x10002"
Booting is getting struck in rtc32k_enable() function (Path - u-boot-2013.10-ti2013.12.01/arch/arm/cpu/armv7/am33xx/board.c).

Processor is not sending PMIC_POWER_EN signal to PMIC. Hence I'm giving 1.8V through power source to "PWR_EN" pin of PMIC TPS65217C.

Kindly help me in enabling the RTC clock and proceeding further.

Regards,

Lahari P.

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi Anil,

Is your RTC powered correctly? Do you have a 32kHz crystal connected to OSC1 pins? Please check this table: http://processors.wiki.ti.com/index.php/AM335x_Schematic_Checklist#RTC

0 Smitha R over 10 years ago in reply to Biser Gatchev-XID

Intellectual 790 points

Hi Biser,

Thanks for the reply.

32kHz crystal is connected to OSC1 pin. Checked table, configuration are proper.

Is RTC clock related to PMIC_POWER_EN signal. I'm not getting this signal from AM3352 processor.

Regads,

Lahari P.

0 Biser Gatchev-XID over 10 years ago in reply to Smitha R

TI__Guru**** 393215 points

This is strange. Can you post the part of the schematic with the PMIC_POWER_EN connections? Have you checked that RTC_PWRONRESETn is released properly?

0 Smitha R over 9 years ago in reply to Biser Gatchev-XID

Intellectual 790 points

Hello Biser,

PFB PMIC_POWER_EN schematic part.

Unable to check RTC_PWRONRESETn pin as there is no capacitor or resistor to check signal.

One more observation : RTC_KALDO_EN and CAP_VDD_RTC are 0v respectively. Does this effect the RTC signal?

Kindly help.

Thanks and regads,

Lahari P.

0 Biser Gatchev-XID over 9 years ago in reply to Smitha R

TI__Guru**** 393215 points

These connections are OK.

Anil P said:
One more observation : RTC_KALDO_EN and CAP_VDD_RTC are 0v respectively. Does this effect the RTC signal?

Could you also post the power supply connections of the processor? There may be an issue there.

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AM3352 : RTC clock enable