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How to configure a RPI4 to use the Witty pi5 rx8025 RTC as hardware clock ?
I tried
dtoverlay=i2c-rtc,rx8025,i2c_address=0x51
, but here's the output of hwclock -r:
hwclock: Cannot access the Hardware Clock via any known method.
Posted : 21/11/2025 2:22 pm
The RTC on the Witty Pi 5 isn't directly connected to the Raspberry Pi. It connects to the MCU, which emulates an I2C device for the Raspberry Pi.
You can not use the rx8025 driver directly.
Posted : 21/11/2025 2:34 pm