Configuration List for UniPi Neuron (Raspberry Pi 4)

The list contains configuration and their respective variables that can be used with balena devices. Some of which will automatically appear for devices with supervisor v7.0.0 and greater. While they may not automatically populate in the Configuration dashboard, most of these variables can still be used with older supervisor versions, so be sure to check the Supported by context for each configuration.

In addition to these values, there may be device-type specific configuration variables that can be set. For example, these are a few of the values that apply to Raspberry Pi devices, corresponding to the contents of the Raspberry Pi config.txt file.

Warning: Wrong configuration may potentially leave a device inaccessible. Be sure to try your changes in a controlled environment before applying them to production devices.

Variable Name	Description	Will reboot	Type	Default
RESIN_SUPERVISOR_CONNECTIVITY_CHECK	Enable / Disable Cloudlink connectivity check	No	false, true	true
RESIN_SUPERVISOR_LOG_CONTROL	Enable / Disable logs from being sent to balena API	No	false, true	true
RESIN_SUPERVISOR_POLL_INTERVAL	Define the balena API poll interval in milliseconds	No	integer	900000
RESIN_SUPERVISOR_VPN_CONTROL	Enable / Disable Cloudlink service on device	No	false, true	true
RESIN_SUPERVISOR_PERSISTENT_LOGGING	Enable persistent logging. Only supported by supervisor versions >= v7.15.0.	Yes	false, true	false
RESIN_SUPERVISOR_INSTANT_UPDATE_TRIGGER	Enable / Disable triggering updates instantly on startup or after pushing a release. Only supported by supervisor versions >= v9.13.0.	No	false, true	true
RESIN_OVERRIDE_LOCK	Override existing update lock(s) if your app is stuck in an invalid state under an update lock	No	0, 1	0
BALENA_HOST_SPLASH_IMAGE	Define the PNG image to be used for the boot splash screen. Only supported by supervisor versions >= v12.3.0.	Yes	string
BALENA_SUPERVISOR_HARDWARE_METRICS	Enable / Disable reporting device metrics such as CPU usage for bandwidth conservation. Only supported by supervisor versions >= v12.8.0.	No	false, true	true
RESIN_HOST_CONFIG_disable_splash	Enable / Disable the splash screen to display image on boot.	Yes	0, 1	1
RESIN_HOST_CONFIG_dtparam	Define DT parameters for the default overlay.	Yes	string	"i2c_arm=on","spi=on","audio=on"
RESIN_HOST_CONFIG_dtoverlay	Define DT overlays	Yes	string
RESIN_HOST_CONFIG_enable_uart	Enable / Disable UART	Yes	0, 1	1
RESIN_HOST_CONFIG_gpu_mem	Define device GPU memory in megabytes.	Yes	integer	16
RESIN_HOST_CONFIG_gpio	Allows GPIO pins to be set to specific modes and values at boot time.	Yes	string
BALENA_HOST_CONFIG_hdmi_cvt	Define a custom CVT mode for the HDMI	Yes	string
BALENA_HOST_CONFIG_hdmi_force_hotplug	Force the HDMI hotplug signal	Yes	0, 1	0
BALENA_HOST_CONFIG_hdmi_group	Define the HDMI output group	Yes	integer	0
BALENA_HOST_CONFIG_hdmi_mode	Define the HDMI output format	Yes	integer	1
BALENA_HOST_CONFIG_display_rotate	Define the rotation or flip of the display	Yes	string	0
BALENA_HOST_CONFIG_hdmi_force_hotplug:1	Force the HDMI hotplug signal on HDMI port 2 Only supported by supervisor versions >= v14.6.0.	Yes	0, 1	0
BALENA_HOST_CONFIG_hdmi_group:1	Define the HDMI output group on HDMI port 2 Only supported by supervisor versions >= v14.6.0.	Yes	integer	0
BALENA_HOST_CONFIG_hdmi_mode:1	Define the HDMI output format on HDMI port 2 Only supported by supervisor versions >= v14.6.0.	Yes	integer	1

You can find more information on updating config.txt through configuration variables in our Advanced Boot Configuration Guide. In addition to the dashboard, this configuration can be also be set using the API or any of its clients, including the SDK and CLI. If you are using configuration to specify i2c or other interfaces, then check out the docs on how to go about interacting with hardware.