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  1. ygoe's post in SPI communication nonfunctional, no data received was marked as the answer   
    I have found the solution. The bus number must be 1, not 0 as explained everywhere. This will create the device /dev/spidev1.0 instead of spidev0.0 and applications must be adapted. But with this modification I can access the SPI device.
    So here's the relevant overlay configuration in /boot/armbianEnv.txt:
    overlays=spi-spidev param_spidev_spi_bus=1  
    And the SPI interface can be used only under this path: /dev/spidev1.0
    Who knows where that bus number 0 leads to...
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