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I am trying to add an ENC28J60 (ethernet controller with SPI interface) to my Raspberry Pi Compute Module board. In section 2.6 the datasheet explains that the full duplex / half duplex mode is set by the configuration of the LEDB pin. My question is: does anyone know if the corresponding PHCON1.PDPXMD register is set by the Linux driver after reset? Basically, do I need to worry about the way I wire LEDB? If I do, which way should I wire it? I assume I want to default to half-duplex operation, as that is how the controller is detected in automatic duplex negotiation.

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