We've known about Debug-USB for a while [1] and suspected that the new "dockchannel UART" ends up there somehow. Turns out, at least macOS 26 just comes with a driver for this: After switching the port to the correct mode [2] /dev/cu.kis-100000-ch-0,1,2 and 3 appear and the first one indeed is the other end of that new UART!
Now we just need to sniff USB and actually implement the protocol and then we get a very cool low-level UART without any additional hardware since we can enter this mode directly on the device from m1n1!

[1] asahilinux.org/docs/hw/soc/usb
[2] github.com/AsahiLinux/tuxvdmto

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