Compute Module • PCF85063A Time Fluctuation on CM4

I’m using a custom board with a CM4 and the PCF85063A RTC connected via I2C1 (PIN 56, PIN 58).

I added the following lines to /boot/config.txt:

dtparam=i2c_arm=on
dtoverlay=i2c-rtc,pcf85063a

This is the OS information:

lsb_release -a
No LSB modules are available.
Distributor ID: Raspbian
Description: Raspbian GNU/Linux 11 (bullseye)
Release: 11
Codename: bullseye
rc@raspberrypi:~ $ uname -a
Linux raspberrypi 6.1.21-v8+ #1642 SMP PREEMPT Mon Apr 3 17:24:16 BST 2023 aarch64 GNU/Linux
After this, the RTC driver loads successfully, and I can view the RTC time using timedatectl. However, the RTC time fluctuates.
Any ideas for what could be going wrong?

Statistics: Posted by lmtan91 — Sat Nov 30, 2024 5:04 am — Replies 0 — Views 29

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