7 FAQ

  1. Why do certain functions fail after installing the official Raspberry Pi OS on ED-CM4NANO?​

We recommend using our customized system image. Alternatively, download and install our BSP to enable external interfaces.

  1. Does ED-CM4NANO support booting from a Micro SD card?​

No. The Micro SD slot is for data storage only. The OS must be installed on the eMMC.

  1. Are any signals occupied on the 40-PIN header?
  • Buzzer: GPIO6 is occupied. Disable it by removing resistor R39 to disconnect the circuit.
  • ​SD Card: GPIO22–27 are occupied when an SD card is inserted. Avoid inserting an SD card if unused.
  1. How to install the operating system?​

Refer to the User Manual for detailed instructions.

  1. How to resolve the error "config failed hub doesn't have any ports! (err -19)" during boot?

Remove "otg_mode=1",[cm4] from config.txt and add "dtoverlay=dwc2,dr_mode=host".