Monthly Archives: January 2018

Raspberry Pi 3 – UART Serial

The Raspberry Pi UARTs
RPi Serial Connection
STICKY: Pi3 UART stopped working? Read this.

PL011 UART    => wireless/Bluetooth module
mini UART     => Linux console output

PL011 UART    => /dev/ttyAMA0
mini UART     => /dev/ttyS0
Linux console => /dev/serial0  => primary UART

mini UART            => core frequency of the VPU on the VC4 GPU
VPU frequency change => baud rate of the UART also changes

config.txt           => enable_uart=1
/boot/cmdline.txt    => console=serial0,115200

BCM2835 ARM Peripherals (PDF)

dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1 root=PARTUUID=20586949-02 rootfstype=ext4 elevator=deadline rootwait