How to disable RTC FOUT Controller functionality in Verdin-iM8mp firmware?

Technical Support
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Hello All,

We are using Verdin-iMX8MP SOM and creating custom image based on Toradex reference minimal image. The below version from Toradex we using:

Torizon OS : Reference Minimal Image
Toradex BSP : Toradex BSP version 7.4.0
Linux Kernel : Linux Kernel version 6.6.94 LTS
Machine : verdin-imx8mp
Yocto Release : Yocto 5.0 (Scarthgap)
Distro (Distribution) : tdx-xwayland
Architecture : ARM64

The RTC RX8130CE that populate on SOM we want to disable the FOUT controller functionality in FW. To minimize the RTC battery power consumption that’s the purpose we want to do this. The Current consumption we want max 500nA.

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Questions we have:

  1. The application note of RX8130CE said it can possible to set bit of FOUT Frequency Selection to OFF. What is the default state of this bit in Toradex BSP?

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  1. If this by default enable how to disable in FW? Whether it in U-Boot or it required to do in Kernel?
  2. What is the default pin state of SCL and SDA in Toradex BSP? Is it LOW or HIGH?

Thanks in Advanced.!!

Vishal

2

Hi, I’m the Toradex AI Assistant.

I might make mistakes or occasionally get you wrong. Our support team will step in if needed.

Hello Vishal,

I understand you’re working with the Verdin iMX8MP module and want to disable the FOUT controller functionality on the RX8130CE RTC to reduce power consumption. However, I don’t have specific information in the available documentation about the default FOUT configuration for the RX8130CE RTC or the specific register settings in the Toradex BSP.

The available sources discuss RTC functionality in general terms (1) and mention that the Verdin iMX8M Plus module features an RTC IC on the module equipped with an accurate 32.768 kHz quartz crystal (2). However, they don’t provide the specific details about:

  1. The default state of the FOUT Frequency Selection bit in the Toradex BSP
  2. How to disable the FOUT functionality in firmware
  3. The default pin states of SCL and SDA

For detailed RTC register configuration and power management settings specific to the RX8130CE on your Verdin iMX8MP module, I’d recommend:

Check out these potentially useful sources: Real-Time Clock / RTC (Linux), Internal RTC issue

Would you like me to provide a general answer based on my knowledge of RTC configuration instead?

Best regards, Toradex AI Assistant.

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