树莓派开机默认配置文件：/boot/config.txt
# For more options and information see
# http://www.raspberrypi.org/documentation/configuration/config-txt.md
# 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= # uncomment this if your display has a black border of unused pixels visible
# and your display can output without overscan
disable_overscan= # uncomment the following to adjust overscan. Use positive numbers if console
# goes off screen, and negative if there is too much border
#overscan_left=
#overscan_right=
#overscan_top=
#overscan_bottom= # uncomment to force a console size. By default it will be display's size minus
# overscan.
#framebuffer_width=
#framebuffer_height= # uncomment if hdmi display is not detected and composite is being output
#hdmi_force_hotplug= # uncomment to force a specific HDMI mode (this will force VGA)
#hdmi_group=
#hdmi_mode= # uncomment to force a HDMI mode rather than DVI. This can make audio work in
# DMT (computer monitor) modes
#hdmi_drive= # uncomment to increase signal to HDMI, if you have interference, blanking, or
# no display
#config_hdmi_boost= # uncomment for composite PAL
#sdtv_mode= #uncomment to overclock the arm. MHz is the default.
#arm_freq= # 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 the lirc-rpi module
#dtoverlay=lirc-rpi # Additional overlays and parameters are documented /boot/overlays/README # Enable audio (loads snd_bcm2835)
dtparam=audio=on # NOOBS Auto-generated Settings:
hdmi_force_hotplug=