raspberrypi:/boot/firmware $ cat config.txt
# For more options and information see
# http://rptl.io/configtxt
# Some settings may impact device functionality. See link above for details

# Uncomment some or all of these to enable the optional hardware interfaces
dtparam=i2c_arm=on
dtparam=i2s=on
dtparam=spi=on

#dtoverlay=pwm-2chan,pin=18,func=2,pin2=13,func2=4

# Additional overlays and parameters are documented /boot/overlays/README
+ #turn wifi and bluetooth off
+ dtoverlay=pi3-disable-wifi
+ dtoverlay=pi3-disable-bt

# Enable audio (loads snd_bcm2835)
#dtparam=audio=on
# Additional overlays and parameters are documented
# /boot/firmware/overlays/README

# Automatically load overlays for detected cameras
camera_auto_detect=1

# Automatically load overlays for detected DSI displays
#display_auto_detect=1

# Automatically load initramfs files, if found
#auto_initramfs=1

# Enable DRM VC4 V3D driver
#dtoverlay=vc4-kms-v3d
max_framebuffers=2

# Don't have the firmware create an initial video= setting in cmdline.txt.
# Use the kernel's default instead.
disable_fw_kms_setup=1

# Run in 64-bit mode
arm_64bit=1

# Disable compensation for displays with overscan
disable_overscan=1

# Run as fast as firmware / board allows
arm_boost=1

[cm4]
# Enable host mode on the 2711 built-in XHCI USB controller.
# This line should be removed if the legacy DWC2 controller is required
# (e.g. for USB device mode) or if USB support is not required.
#otg_mode=1

[cm5]
#dtoverlay=dwc2,dr_mode=host

[all]
enable_uart=0
dtoverlay=hifiberry-dac,slave=true
dtoverlay=hifiberry-digi,slave=true
initramfs initrd.img-4.19.97-v7+-overlay
pi@raspberrypi:/boot/firmware $