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While the Super I/O IC used in the NUC6i7KYK does provide a (single) 16550-compatible UART, it shares pins with other necessary features and thus is not available. Further, since the processor used in the NUC6i7KYK comes from the Mobile (as opposed to the Embedded) processor line, it is not a SOC with embedded serial I/O capabilities. Bottom line, there are no useable serial ports in the NUC6i7KYK.
Thanks a lot for your reply!
We're trying to boot our in-house kernel on the NUC6i7KYK and right now, without serial, we're like mudding in the dark.
So if you don't mind, I want to ask if you know whether the legacy mode (opposed to UEFI) of the NUC6i7KYK supports VGA mode so that we can just poke the B8000 video buffer?