Disabling Bluetooth, Wifi And The Serial Console - Sferalabs SPMB21X User Manual

Disabling Bluetooth, WiFi and the serial console

On Raspberry Pi 3, the main UART is used for Bluetooth, and the TX/RX pins on the GPIO
connector are controlled by a limited function Mini UART.
To route the main UART to the RX/TX pins that are connected to the Strato Pi serial ports
you should disable Bluetooth. Edit /boot/config.txt and add these lines at the end of the file:
# Disable Bluetooth
dtoverlay=pi3-disable-bt
You may also run the following command to disable the Bluetooth HCI UART driver:
sudo systemctl disable hciuart
If you need to disable the WiFi, one convenient solution on Raspbian distributions is to
blacklist the WiFi driver. Edit /etc/modprobe.d/raspi-blacklist.conf and add these lines at
the end of the file:
# Disable WiFi
blacklist brcmfmac
blacklist brcmutil
Note that Bluetooth must be disabled to ensure proper operation of Strato Pi's serial ports.
If you are using Strato Pi's serial ports for your applications, you also need to disable the
Linux serial console, otherwise it will send console data to the serial port.
Disable the ttyAMA0 console service:
sudo systemctl disable serial-getty@ttyAMA0.service
Edit the /boot/cmdline.txt file and delete the serial console configuration:
console=serial0,115200
16 Strato Pi Base User Guide