Hipster circuits has a useful tutorial on how to enable SPI2.1 on a BeagleBone.
Well, the SPI 2.0 is enabled in user space and has been for a while now. However, the Replicape uses both SPI 2.0 (CS0) and SPI 2.1 (CS1). So how can that be enabled as well? Newer versions of the Linux kernel enables automatic pin-muxing by reading the contents of the EEPROM, but you still need to recompile the kernel to enable a second channel for the SPI.
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