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On my pocket beagle, which runs Debian, I have three spidev devices (spidev1.0, spidev2.0 and spidev2.1).

I have a SPI temp sensor on spi1 (which is spidev2.0 and spidev2.1). Loopback tests on 2.0 (by jumpering MOSI and MISO) worked. The data came back to me. However I was unable to send data to the temp sensor. When I switched to 2.1, everything worked normally.

Why is that? What is the difference between 2.0 and 2.1?

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From what I've read, spidev2.0 and 2.1 refer to the Chip Select that has been configured for them. Which chipselect 2.0 is using though, I have no idea, but the chipselect for 2.1 must be the one labeled as chip select on the board.

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