Raspberry Pi 4B uart3 enable documentation
Raspberry Pi 4B uart3 enable documentation Rpi4 uart3 enable https://forums.raspberrypi.com/viewtopic.php?t=340392 Forum Post about enabling uart3 dtoverlay=uart3 is all you need for enabling it (either w/ or w/o flow control). I.e. on my CM4 DUT You add a line to the config.txt file to apply a Device Tree overlay . dtoverlay=uart4 dtoverlay=uart3 or dtoverlay=uart3,ctsrts //here I trying both with and without "ctsrts" gives me pi@64bit-test:~ $ raspi-gpio get BANK0 (GPIO 0 to 27): GPIO 0: level=1 fsel=0 func=INPUT pull=UP GPIO 1: level=1 fsel=0 func=INPUT pull=UP GPIO 2: level=1 fsel=0 func=INPUT pull=UP GPIO 3: level=1 fsel=0 func=INPUT pull=UP GPIO 4: level=1 fsel=3 alt=4 func=TXD3 pull=NONE GPIO 5: level=1 fsel=3 alt=4 func=RXD3 pull=UP GPIO 6: level=1 fsel=0 func=INPUT pull=UP GPIO 7: level=1 fsel=0 func=INPUT pull=UP GPIO 8: level=1 fsel=3 alt=4 func=TXD4 pull=NONE GPIO 9: level=1 fsel=3 alt=4 func=RXD4 pull=UP GPIO 10: level=0 fsel=0 func=INPUT pull=DOWN GP