VisionFive2 Clock on I2C RTC-DS1307

This is a package to read clock from an external RTC DS1307 via I2C bus.

There are two systemd units in the package

1. rtc-ds1307-boot.service this unit run at sysinit.target to make sure the system clock is loaded from the RTC earlier than other services.
2. rtc-ds1307-shutdown.service this unit run before shutdown or reboot to update the RTC to the most recent system clock before shutdown or reboot.

Both units execute a script rtc-ds1307.sh with boot or shutdown parameters.

With boot parameter, the script will load module rtc_ds1307 first, and then try to instantiate ds1307 at the given I2C bus and address provided by /etc/rtc-ds1307.conf. If success, it will set system clock from the external RTC /dev/rtc1, and then set the internal RTC /dev/rtc0 to match the system clock. So, if there is any program that hardcoded to use /dev/rtc0, it will be fine.

With shutdown parameter, the script will set the external RTC clock with the current system clock.

Building

makepkg -s

Installing

sudo pacman -U visionfive2-i2c-rtc-ds1307-[version-release]-any.pkg.tar.zst
sudo systemctl enable rtc-ds1307-boot.service
sudo systemctl enable rtc-ds1307-shutdown.service

License

This package is under MIT License.