CM-T43: Yocto Linux: Automatic Installation

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This article provides an installation guide for Yocto Linux kernel and Arago root file system on the CompuLab CM-T43 System-on-Module / Computer-on-Module eMMC internal storage device.

Preparation steps

  • Obtain a PC workstation with a serial communication port or a free USB 2.0 Host port.
  • Download the Yocto Linux package for CM-T43 from CompuLab website. Unzip the package to a directory on your host workstation.
  • Copy the content of the package install folder to an SD card. The SD card must be at least of 1GB size.

Automatic Installation

  • Connect the host PC to the CM-T43 base-board (connector P8) via the serial cable supplied with the evaluation kit.
Admolition note.png SB-SOM-T43 base-board features Serial-to-USB adapter available through connector P7. It can be used as an alternative debug port to connect the Host PC via the micro-USB cable supplied with the evaluation kit
  • Start terminal emulation software on your PC with the following serial port settings:
Baud Rate Data Bits Stop Bits Parity Flow Control
115200 8 1 none none
  • Insert the MMC/SD card into the MMC/SD socket (P9) on the SB-SOM-T43 baseboard.
  • Turn on the CM-T43 evaluation system.
  • The system will boot from the SD card and start the automatic installation procedure.
Press any key to cancel installation   0
=== Mount Source /dev/mmcblk0p1 ===
* mount_source [  ]
===Installing OS===
* Updating partitions
* Formatting partitions
* mount_destination [  ]
* Copying kernel files
* Extracting user space rootfs.tar.bz2
 432MiB 0:10:03 [ 732KiB/s] [================================>] 100%            
* unmount_destination [  ]
=== Unmount Source /dev/mmcblk0p1 ===
* unmount_source [  ]
Please remove installation SD card ...
Press any key to cancel restart   0
umount: can't umount /root/install: Invalid argument
The system is going down NOW!
Sent SIGTERM to all processes
Sent SIGKILL to all processes
Requesting system reboot
[  640.525944] reboot: Restarting system
  • The system will reboot automatically to the newly installed Debian Linux, with or without the SD-card in the slot. However, for subsequent boots, make sure the SD-card is out, or the installation procedure will be rerun.


  • Automatic installation doesn't start.

The U-Boot environment should be set to default:

  • Power on the board.
  • Press and hold Ctrl-C to get command prompt.
  • Set default U-Boot environment and boot the board:
# env default -a
# boot

See also