Raspberry Pi: attach a serial console

juin 2, 2017

For a Raspberry Pi with GPIO pins (B, B+, 2, 3):

Connect as follows:
Append this line at the end of /boot/config.txt:
```
enable_uart=1
```
Access the console from your workstation like this:
```
sudo screen /dev/ttyUSB0 115200
```

Sources:

For Raspberry Pi without pins (Pi Zero, Pi Zero W):

Add the following line at the end of /boot/config.txt:
```
dtoverlay=dwc2
```
Insert the following between 'rootwait' and 'quiet' in /boot/cmdline.txt:
```
modules-load=dwc2,g_serial
```

Mount the linux part of the Pi SD card and add the following lines at the end of /etc/rc.local, before 'exit 0':

usbconsole="getty@ttyGS0.service"
if [ ! $(systemctl is-enabled "${usbconsole}") ]
then
echo "Enabling and starting ttyGS0 console..."
systemctl enable "${usbconsole}"
systemctl start "${usbconsole}"
fi

Connect a micro usb cable into the socket market 'USB' on the Pi, ~~not the one marked 'PWR'~~.
On your workstation, console can be accessed as: sudo screen /dev/ttyACM0 115200

Sources: