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Octopus EZ board does not work together with the EZ5160 (48V) + EZ2209 (24V)

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I am having problems getting the TMC5160 drivers to work on the BTT Octopus Max EZ.

Whenever I define “spi_bus = spi4” in the Klipper config, the board crashes. In the log file you can see the message “b’Got EOF when reading from device’”.

In the attached log is the first start with the config “spi_bus = spi4”.
and the second start without the spi_bus config.

If the spi_bus parameter is not present the board works normally.

The drivers themselves work in a BTT SKR 3 EZ without problems.

Can someone help me to find the error?

Is this a configuration bug, a Klipper bug or a hardware bug?

Thank you.

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