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GPIO support
alix1e This board offers a GPIO header connected to the super I/O controller.
alix2,3,6 Alix boards have 4 GPIOs available, the three LEDs D4, D5, D6 and the button S1. These are also connected to connector J13. If you intend to use the LED pins as inputs, please remove the LEDs or limit the input current.

For additional GPIO, consider a I2C I/O expander, e.g. from NXP or TI. Easy to use modules can be found at aliexpress.com.

apu1 The three LEDs D5, D6, D7 and the button S1 are connected to the AMD FCH south bridge. Sample code

The pin header J19 has 16 GPIO pins connected to the Nuvoton NCT5104D super I/O. Data sheet and GPIO patch

apu2 The three LEDs D4, D5, D6 and the button S1 are connected to the AMD CPU. Sample code. A driver can also be found at https://daduke.org/linux/apu2/.

The pin header J17 has 16 GPIO pins connected to the Nuvoton NCT5104D super I/O. Data sheet and GPIO patch

I2C
apu2 i2cpiix4.tar.gz
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