Adding External RTC (pcf8523) to Jetson Nano via i2c

Dear all,

We tried to add an external rtc module to the Jetson Nano. The rtc module we want to add is the pcf8523 to i2c-0.

We did the same steps as descripted in topic Adding External RTC to Jetson Nano via i2c. We added the lines for the pcf8523 to the dts file we extracted from the Jetson Nano. Afterwards we compiled the dts into a dtb file.

Then we coppied the dtb file to /boot/dtb and added the following line “FDT </boot/thefile.dtb>” to /boot/extlinux/extlinux.conf.

After rebooting no extra rtc module was added in the /dev. We executed the following command “echo pcf8523 0x68 | tee /sys/class/i2c-dev/i2c-0/device/new_device”. No extra rtc module as created in /dev.

What step do we miss the get the rtc module working?

Thanks in advance.

  1. Check the dtb was loaded correctly.
sudo dtc -I fs -O dts -o extracted_proc.dts /proc/device-tree
  1. Check if any kernel message for pcf8523