eiselekd

Enable DCI debugging on Gigabyte-BKi5HA-7200
--------------------------------------------

The Gigabyte-BKi5HA-7200 (Kabylake i5-7200 processor) can be debugged with only a USB debug cable, a
special cable that crosses only the data signals and has the power signals
removed. You can buy these cables at i.e. https://www.datapro.net/products/usb-3-0-super-speed-a-a-debugging-cable.html
The hurdle you have to overcome  before you can access DCI however is that you
need to set some bits in hardware that first enable DCI and also enable the debug port so that DCI can control the cores.
There are lots of guides in howto patch the BIOS but only these two really describes all the steps using only freely accessible tools:

gbaman

Raspberry Pi Zero OTG Mode

Simple guide for setting up OTG modes on the Raspberry Pi Zero - By Andrew Mulholland (gbaman).

The Raspberry Pi Zero (and model A and A+) support USB On The Go, given the processor is connected directly to the USB port, unlike on the B, B+ or Pi 2 B, which goes via a USB hub.
Because of this, if setup to, the Pi can act as a USB slave instead, providing virtual serial (a terminal), virtual ethernet, virtual mass storage device (pendrive) or even other virtual devices like HID, MIDI, or act as a virtual webcam!
It is important to note that, although the model A and A+ can support being a USB slave, they are missing the ID pin (is tied to ground internally) so are unable to dynamically switch between USB master/slave mode. As such, they default to USB master mode. There is no easy way to change this right now.
It is also important to note, that a USB to UART serial adapter is not needed for any of these guides, as may be documented elsewhere across the int