config.txt

# Default Nerves RPi 4 config.txt
#
# It's possible to override this file by using a custom fwup.conf
# configuration to pull in a replacement.
#
# Useful links:
# http://rpf.io/configtxt
# https://www.raspberrypi.org/documentation/configuration/device-tree.md
# https://github.com/raspberrypi/documentation/blob/master/configuration/device-tree.md
# https://github.com/raspberrypi/firmware/blob/master/boot/overlays/README

# Disable the boot rainbow
disable_splash=1

# This, along with the Raspberry Pi "x" firmware is needed for the camera
# to work. The Raspberry Pi "x" firmware is selected via the Buildroot
# configuration. See Target packages->Hardware handling->Firmware.
gpu_mem=192

# Enable I2C, SPI, and audio
dtparam=i2c_arm=on
dtparam=spi=on
dtparam=audio=on

# Enable drivers for the Raspberry Pi 7" Touchscreen
#
# This makes it possible to run Scenic out of the box with the popular
# Raspberry Pi 7" Touchscreen. It appears to be harmless for non-touchscreen
# users, but if not, let us know!
# NOTE: The touchscreen seems to work fine with these commented out on the RPi4
#dtoverlay=rpi-ft5406
#dtoverlay=rpi-backlight

# Comment this in or modify to enable OneWire
# NOTE: check that the overlay that you specify is in the boot partition or
#       this won't work.
#dtoverlay=w1-gpio-pullup,gpiopin=4

# The ramoops overlay works with the pstore driver to preserve crash
# information across reboots in DRAM
dtoverlay=ramoops

# Enable the UART (/dev/ttyS0)
enable_uart=1

# Enable DRM VC4 V3D driver on top of the dispmanx display stack
#dtoverlay=vc4-fkms-v3d
#max_framebuffers=2