buildroot/board/raspberrypi/config_cm5io.txt

# Please note that this is only a sample, we recommend you to change it to fit
# your needs.
# You should override this file using BR2_PACKAGE_RPI_FIRMWARE_CONFIG_FILE.
# See http://buildroot.org/manual.html#rootfs-custom
# and http://elinux.org/RPiconfig for a description of config.txt syntax

kernel=Image

# To use an external initramfs file
#initramfs rootfs.cpio.gz

# Disable overscan assuming the display supports displaying the full resolution
# If the text shown on the screen disappears off the edge, comment this out
disable_overscan=1

# enable RTC
dtparam=i2c_vc=on
dtoverlay=i2c-rtc,pcf85063a,i2c_csi_dsi

# enable dwc2 USB controller (USB 2.0)
dtoverlay=dwc2,dr_mode=host

# Enable UART0 for serial console on ttyAMA0
dtparam=uart0_console=on