If you don t want to plug in external hardware to the pi you can use the built in uart on the rx tx pins.
Usb to uart serial console cable.
Please be warned that counterfeit fake pl 2303hx chip rev a usb to serial controller ics using prolific s trademark logo brandname and device drivers were being sold in the china market.
The cable is easiest way ever to connect to your microcontroller raspberry pi wifi router serial console port.
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If needed install an appropriate silicon labs cp210x usb to uart bridge driver on the workstation used to connect with the system.
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The hard way using built in uart.
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A uart or serial console is absolutely essential when doing bootloader or kernel development on any computer.
But if you do this you ll lose the serial console so if you re using a piuart or console cable or hat that lets you connect directly to the console that will no longer work and you ll have to use the hdmi keyboard or ssh method of running commands.
Counterfeit ic products show exactly the same outside chip markings but generally are of poor quality and causes windows driver compatibility issues.
Inside the big usb plug is a usb serial conversion chip and at the end of the 36 cable are four wire red power black ground white rx into usb port and green tx out of the usb port.
A silicon labs cp210x usb to uart bridge driver is used to provide access to the console which is exposed via the usb mini b 5 pin port on the appliance.
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