Step 3: Program the Yocto firmware

The ConnectCore 6UL is shipped without a default operating system loaded. Only U-Boot is flashed in the device. This step demonstrates how to install Yocto in your ConnectCore 6UL.

1. Establish a serial connection with your device

Before you start programming the firmware, you must open a serial connection with the device. You can use any serial terminal program such as Tera Term, Minicom, CoolTerm, or HyperTerminal.

Open a serial connection with the following settings:




Serial port where the device is connected

Baud rate


Datat bits




Stop bits


Flow control


2. Program the firmware

Once you have established the serial connection, you can start the firmware update process. Follow these steps to install Yocto in the device:

  1. Download the firmware images from this location:
  2. Decompress
  3. Place the decompressed files in the root of a FAT-formatted microSD card and insert it in the microSD socket of the ConnectCore 6UL SBC Express (bottom side).

  4. Reset the device by pressing the reset button on the board and immediately press any key in the serial terminal to stop the auto-boot process. The U-Boot bootloader prompt displays:

U-Boot dub-2015.04-r8.3+g0de0373ade (Apr 24 2017 - 02:22:53)

CPU:   Freescale i.MX6UL rev1.1 528 MHz (running at 396 MHz)
CPU:   Industrial temperature grade (-40C to 105C) at 41C
Reset cause: POR
I2C:   ready
DRAM:  256 MiB
MCA:   HW_VER=0.1 FW_VER=0.4
PMIC:  PFUZE300 DEV_ID=0x30 REV_ID=0x11
NAND:  256 MiB
In:    serial
Out:   serial
Err:   serial
ConnectCore 6UL SOM variant 0x02: Industrial Ultralite 528MHz, 256MB NAND, 256MB DDR3, -40/+85C, Wireless, Bluetooth
Board: ConnectCore 6UL StarterBoard, version 2
Net:   FEC0
Hit any key to stop autoboot:  0 
  1. Install the firmware into the NAND, executing the following command:
=> run install_linux_fw_sd

Note During installation, error messages appear when the installation process attempts to override MAC addresses. These messages are expected.

  1. Once the firmware is installed, the device boots automatically. The default username is root with no password.