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I do not know what version of the firmware you are using, but for any current version on the RPi 3B, or RPi 4B this two-step procedure by @MatthijsKooijman still works. It may also work on other versions, but I've not tested it. In other words: It seems that you have made an error somewhere, or your configuration has been altered. Follow the detailed ...


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Yes - and since the introduction of the RPi 4B and the BCM2711 SoC, the number of I2C buses available has increased. The number of physical pins didn't increase with the RPi 4B, but these additional I2C buses are accessed through the the i2c_mux_pinctrl kernel module. Most of these "newly exposed" i2C channels may be configured through the /boot/...


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