PROCESSOR-SDK-AM335X: No debug output with RTC disabled

Ugnius Subacius

Expert 1180 points

Part Number: PROCESSOR-SDK-AM335X

Hi.

I am modifying the am335x starter kit hardware and SDK kernel, to not use RTC.

I disabled RTC in device tree and kernel config.

There is no print referring to RTC on the boot log.

When modifying the hardware as suggested, the linux stop booting if I connect RTC_PWRONRSTn to ground.

I did the modifications as suggested: http://processors.wiki.ti.com/index.php/AM335x_Schematic_Checklist#RTC

But if I connect RTC_PWRONRSTn to gnd and not 1.8V, then I get no print on the serial.

Does this suggest that something is still trying to use RTC?

Kind regards,

Ugnius

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

Hi,

You should check your SPL sources and remove all code referring to RTC from there.

0 Ugnius Subacius over 8 years ago in reply to Biser Gatchev-XID

Expert 1180 points

Hi Biser,

Where are the SPL source files?

I can only see a u-boot-spl.cfg in board_support/u-boot/spl/

Is this where spl configuration is?

Kind regards,

Ugnius

0 Ugnius Subacius over 8 years ago

Expert 1180 points

Hi,

It looks like I needed to modify file:

/include/configs/ti_am335x_common.h

it had #define CONFIG_SPL_AM33XX_ENABLE_RTC32K_OSC which I took out.

Now the board boots up with RTC disabled.

Kind regards,
Ugnius

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PROCESSOR-SDK-AM335X: No debug output with RTC disabled