树莓派-树莓派的BIOS-config.txt

• 官方文档
  https://www.raspberrypi.com/documentation/computers/config_txt.html

• WiKi
  https://elinux.org/RPiconfig

编辑文件/boot/config.txt
关于 dtoverlay 的详细文档 https://www.raspberrypi.com/documentation/computers/config_txt.html#overlay_prefix

sudo find / -name 'overlays' -type d
/sys/kernel/config/device-tree/overlays
/boot/overlays

• 彻底关闭 WiFi，添加到最后
  dtoverlay=disable-wifi

• 禁用蓝牙
  dtoverlay=disable-bt

https://github.com/raspberrypi/firmware/blob/master/boot/overlays/README

# For more options and information see
# http://rpf.io/configtxt
# Some settings may impact device functionality. See link above for details

# uncomment if you get no picture on HDMI for a default "safe" mode
#hdmi_safe=1

# uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
#disable_overscan=1

# uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=16
#overscan_right=16
#overscan_top=16
#overscan_bottom=16

# uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=1280
#framebuffer_height=720

# uncomment if hdmi display is not detected and composite is being output
#hdmi_force_hotplug=1

# uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=1
#hdmi_mode=1

# uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive=2

# uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost=4

# uncomment for composite PAL
#sdtv_mode=2

#uncomment to overclock the arm. 700 MHz is the default.
#arm_freq=800

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

# Uncomment this to enable infrared communication.
#dtoverlay=gpio-ir,gpio_pin=17
#dtoverlay=gpio-ir-tx,gpio_pin=18

# Additional overlays and parameters are documented /boot/overlays/README

# Enable audio (loads snd_bcm2835)
dtparam=audio=on

[pi4]
# Enable DRM VC4 V3D driver on top of the dispmanx display stack
dtoverlay=vc4-fkms-v3d
max_framebuffers=2
dtoverlay=disable-wifi
dtoverlay=disable-bt
dtparam=act_led_trigger=none
dtparam=pwr_led_trigger=none
dtparam=eth_led0=4
dtparam=eth_led1=4

[all]
#dtoverlay=vc4-fkms-v3d
start_x=0