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Hi Ioan Domuta,
The pin PD8 is routed to the extension board 'XDK gateway'.
It can be used as either GPIO (or) SPI_CS.
Please refer https://xdk.bosch-connectivity.com/documents/37728/87798/XDK_Getting_Started.pdf/9fca7e8c-a2d9-4416-8925-289dd07cd3b6 section 2.2.2
You can test the functionality of this pin using the demo application "XdkExtensionPort". In this application, to configure the pin PD8 as GPIO, please disable the macro EXTENSION_PORT_SPI_FEATURE in AppController.h file.
Lavanya S P