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Common options

Common display options

hdmi_enable_4kp60 (Raspberry Pi 4 only)

By default, when connected to a 4K monitor, the Raspberry Pi 4B, 400 and CM4 will select a 30Hz refresh rate. Use this option to allow selection of 60Hz refresh rates. Raspberry Pi 4 does not support 4Kp60 output on both micro HDMI ports simultaneously. Setting hdmi_enable_4kp60 increases power consumption and temperature.

Common hardware configuration options

camera_auto_detect

With this setting enabled (in Raspberry Pi OS it is enabled by default), the firmware will automatically load overlays for CSI cameras that it recognises. Set camera_auto_detect=0 to disable the setting.

display_auto_detect

With this setting enabled (it is enabled by default in Raspberry Pi OS), the firmware will automatically load overlays for DSI displays that it recognises. Set display_auto_detect=0 to disable.

dtoverlay

The dtoverlay option requests the firmware to load a named Device Tree overlay - a configuration file that can enable kernel support for built-in and external hardware. For example, dtoverlay=vc4-kms-v3d loads an overlay that enables the kernel graphics driver.

As a special case, if called with no value - dtoverlay= - the option marks the end of a list of overlay parameters. If used before any other dtoverlay or dtparam setting, it prevents the loading of any HAT overlay.

For more details, see DTBs, overlays and config.txt.

dtparam

Device Tree configuration files for Raspberry Pis support a number of parameters for such things as enabling I2C and SPI interfaces. Many DT overlays are configurable via the use of parameters. Both types of parameters can be supplied using the dtparam setting. In addition, overlay parameters can be appended to the dtoverlay option, separated by commas, but keep in mind the line length limit of 98 characters.

For more details, see DTBs, overlays and config.txt.

arm_boost (Raspberry Pi 4 Only)

All Raspberry Pi 400s and newer revisions of the Raspberry Pi 4B are equipped with a second switch-mode power supply for the SoC voltage rail, and this allows the default turbo-mode clock to be increased from 1.5GHz to 1.8GHz. This change is enabled by default in Raspberry Pi OS. Set arm_boost=0 to disable.

power_force_3v3_pwm (Raspberry Pi 5 Only)

Forces PWM when using a 3V3 power supply. Set power_force_3v3_pwm=0 to disable.