CM-T335: Linux: Automatic Linux Installation

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This article provides an installation guide for Linux kernel and Debian root file system on the CompuLab CM-T335 System-on-Module / Computer-on-Module NAND internal storage device.

Preparation steps

  • Obtain a PC workstation with a serial communication port.
  • Download the Linux package for CM-T335 from CompuLab website. Unzip the package to a directory on your host workstation.
  • Copy the following files from the package folder images to the SD card:
    boot.scr, ramdisk.img, kernel.img, ramdisk.dtb, rootfs.tar.bz2, install.ext2,, zImage-cm-t335, am335x-sbc-t335.dtb.

Automatic Installation

  • Connect the host PC to the SB-T335 base-board (connector P11) via the serial 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 (P23) on the SB-T335 base-board.
  • Connect the DC power supply (12V), included in the evaluation kit, to connector J2.
  • The system will boot from the SD card and start the automatic installation procedure.
Press any key to cancel installation   0
Updating partitions...
[   13.784919]  mmcblk0: p1 p2
Format partitions ...
[   19.328976] random: mkfs.ext4 urandom read with 41 bits of entropy available
Mounting partitions ...
Copy kernel files ...
Extract user space ...
[   30.187868] random: nonblocking pool is initialized
Mounting update disk ...
Update user space file system...
Please remove installation SD card ...
Press any key to cancel restart   0
[  278.026487] EXT4-fs (ram0): re-mounted. Opts: (null)
The system is going down NOW!
Sent SIGTERM to all processes
Sent SIGKILL to all processes
Requesting system reboot
[  280.068187] reboot: Restarting system
  • The system will reboot automatically to the newly installed Debian Linux.
  • Please remember to remove the installation SD card to prevent re-installation.


  • 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