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Frequently Asked Questions

System Failures

  • Can WiFi antenna placement cause the system to fail to boot?

Warning

If the antenna has exposed metal coils or wing sections, please secure it away from the motherboard to prevent short circuits caused by contact with motherboard components. Additionally, antenna radiation can cause electromagnetic interference to the working DDR, potentially leading to data transmission errors, failure to boot, or frequent crashes in severe cases. Solution: Adjust the antenna placement to avoid directly covering or contacting motherboard components.

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Method: Adjust the antenna placement to avoid directly covering motherboard components.

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Network

  • When connecting to WiFi, the message "An application wants access to the keyring "Default keyring", but it is locked" appears?

Cause: A keyring is generated during the first WiFi connection. Setting the Keyring password to empty can avoid this issue.

Method: If it has already appeared, manually delete the keyring file in the directory: ~/.local/share/keyrings.

  • How to connect to WiFi in the Ubuntu desktop system when there is no WiFi button?

1. Enter the Ubuntu terminal and use ifconfig to check the wlan0 node.

2. Use the following command to connect to WiFi

sudo nmcli dev wifi connect "your_WiFi_name" password "WiFi_password" ifname wlan0
  • After setting a static IP for Ethernet on the K1 Android system, the setting is not saved after reboot?

To be supplemented.....

Images

  • After compiling the rk-android SDK, how do I flash it to the development board?

1. Find the compiled image in the rockdev directory. Refer to the corresponding development board Wiki documentation's image flashing chapter for flashing operations.

2. For images generated by separate compilation, use partition flashing. Refer to the documentation in the RKDevTool tool directory for partition flashing.

Peripheral Drivers

  • Can the RK3576 series development boards control the fan based on temperature?

If there is a need to turn on the fan based on temperature, you can use the following nodes to obtain the temperature and control the fan switch.

1. Get the main chip temperature

cat /sys/class/thermal/thermal_zone*/temp

2. Fan switch

/sys/class/leds/fan
  • How to switch OTG to Host?

Enter the device tree and replace the corresponding configuration.

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SDK Compilation

  • What command is used to configure the Android kernel?
./build.sh -M

Chip

  • How to modify the CMA (Contiguous Memory Allocator) size in the Ubuntu 24.04 system for the RK3576?

Refer to the technical documentation in kernel-6.1/Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt to modify the reserved-memory node in kernel-6.1\arch\arm64\boot\dts\rockchip\rk3576-linux.dtsi.