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The C31 board only supports the usb USB OTG cable installation procedure, and only eMMC is supported as a primary boot peripheral. Future releases will include flashing and does not support the uSD/USB proceduressupport.

Android 11 support for SECO SBC C31 includes:

• Wifi/BT

• ADB over ethernet

• Sound support over HDMI

• HDMI and LVDS display with onboard backlight

• Double ethernet card

• 4G modem

• OTA update

• recovery environment

Other supported peripherals include:

• debug UART

• RS232

• I2C busses

• eMMC

• SDCard (storage only, not as a boot device)

• USB (CN7, CN8 and CN10, USB-C not yet supported)

• RTC

HOW TO install SECO Android 11 BSP on onboard eMMC via OTG cable

To flash Android 11 on SECO board using a an OTG cable, please follow these simple steps:

1. Build SECO Android 11 image for C31, and prepare the distro as described in Build Android 11 for SECO Boards - SOLON (formerly SBC- Rockchip C31)

   1. As an alternative, a prebuilt distro will be provided in future releasescan be downloaded at https://secostorage.blob.core.windows.net/secosoftware-public/rockchip/c31/seco-rk3399-c31_android_11.0.0_v1-00-00_20220324.tar.gz

2. Extract the distro archive

   • tar xzf <ANDROID_11_BSP>.tar.gz

3. Change to the uncompressed folder

   • cd <ANDROID_11_BSP_FOLDER>

4. Connect the USB Type-C cable between PC and connector CN9 on the board

5. Insert jumper in JP4, to block watchdog timer and avoid it to reset resetting the board during flashing

6. Execute the script “seco_flash.sh" (requires superuser privileges).

   • ./seco_flash.sh

7. Press button SW3 (in the center of the board), power on the board, and immediately release SW3

8. The scripts script waits for the USB device to flash (“Bus 001 Device 045: ID 2207:330c Fuzhou Rockchip Electronics Company RK3399 in Mask ROM mode”), completely erases the flash memory, partitions it, and writes all the images

9. Wait until the end of the procedure

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