CM-X300: Linux: Getting started

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Preparation steps

Admolition note.png It is possible to install Linux on CM-X300 using either an NFS share or a USB flash drive. The first method is preferred because NFS setup will ease further Linux evaluation and development.
  • Obtain a PC workstation with serial communication port.
  • For installation using NFS install TFTP server on host PC. For Windows machines we recommend TFTPD32 included in the Linux package for CM-X300.
  • Download the Linux package for CM-X300 from CompuLab's website . Unzip the package to a directory on your host workstation.
  • All image files mentioned below can be found in images subdirectory
  • Copy debian-image.ubi and cm-x300-kernel.jffs2 from Linux package for CM-X300 either to a directory exported through NFS or to a USB flash drive.

Image installation

  • Connect the host PC to the CM-X300 via a null modem cable supplied with the Eval Kit.
  • Start terminal emulation software on your PC using the COM port to which the null modem is connected. Set baud rate to 38400 bps, 8 bit per frame, 1 stop bit, no parity, no flow control.
  • Turn on the CM-X300. The U-Boot will start and you will get a command prompt.
Admolition note.png If the boot settings of your CM-X300 are different than default, you may need to press and hold ^C while turning the CM-X300 on, in order to get command prompt.

Installation using NFS

  • Connect CM-X300's ETH0 port to your local Ethernet
  • Make sure that Linux kernel binary image kernel.img, ramdisk image ramdisk.img and bootloader script image bootscr.img are accessible by the TFTP server.
    - On Windows machine: copy kernel.img, ramdisk.img and bootscr.img to the same folder and point the TFTP server to that folder
    - On Linux machine: copy kernel.img, ramdisk.img and bootscr.img to TFTP sevrver root directory, usually /tftpboot or /tftproot.
  • You can use U-boot dhcp command to obtain IP address or manually set ipaddr environment variable:
> setenv ipaddr <CM-X300 ip address>
  • Set serverip environment variable and save the new environment to NAND flash:
> setenv serverip <host ip address>
> saveenv
  • Use the following U-boot command to boot Linux on CM-X300:
> tftp 80400000 bootscr.img && autoscr 80400000
  • After the ramdisk image is loaded you will get Linux login prompt. Login as root into the system.
  • Obtain an IP address for the CM-X300:
    • Using DHCP:
      root@compulab:~# ifup `basename /sys/devices/platform/enet.0/net/eth0`
    • If you do not have a DHCP server, you can set a static IP address using ifconfig:
      root@compulab:~#  ifconfig `basename /sys/devices/platform/enet.0/net/eth0` <ip address>
  • Mount the NFS share containing cm-x300-kernel.jffs2 and debian-image.ubi image:
$  mount -o nolock <host ip>:/path/to/nfs/share /mnt/net
  • Format the NAND flash kernel partition and write the kernel image onto it:
$ flash_eraseall /dev/mtd4
$ nandwrite /dev/mtd4 /mnt/net/cm-x300-kernel.jffs2
  • Format the NAND flash root filesystem partition and write Debian filesystem image onto it:
$ ubiformat -O 2048 /dev/mtd5 -f /mnt/net/debian-image.ubi

Installation using USB flash drive

  • Make sure that CM-X300's ETH0 port is disconnected
  • Make sure that Linux kernel binary image kernel.img, ramdisk image ramdisk.img, kernel JFFS2 image cm-x300-kernel.jffs2, Debian filesystem JFFS2 image debian-image.ubi and bootloader script image bootscr.img are present at the root directory of the USB flash drive.
  • Connect USB flash drive to CM-X300. Use USB2 (host/slave) port.
  • Use the following U-boot command to boot Linux on CM-X300:
> usb start
> fatload usb 0:1 80400000 bootscr.img
> autoscr 80400000
  • After the ramdisk image is loaded you will get Linux login prompt. Login as root into the system.
  • The USB flash drive will be automatically mounted under /media/sda1
  • Format the NAND flash kernel partition and write the kernel image onto it:
$ flash_eraseall /dev/mtd4
$ nandwrite /dev/mtd4 /media/sda1/cm-x300-kernel.jffs2
  • Format the NAND flash root filesystem partition and write Debian filesystem image onto it:
$ ubiformat -O 2048 /dev/mtd5 -f /media/sda1/debian-image.ubi

After Installation

  1. Reset the CM-X300.
    2. Admolition note.png If the boot settings of your CM-X300 are different than default, you may need to press and hold ^C while turning the CM-X300 on, in order to get command prompt.
  2. Set the kernel command line parameters: 
    > setenv bootargs "root=ubi0:ubi-image rootfstype=ubifs ubi.mtd=5 console=ttyS2,38400" && saveenv
  3. To start Linux type: 
    > fsload && bootm
  4. If you want Linux to start automatically, type: 
    > setenv bootdelay <delay in seconds> 
> setenv bootcmd "fsload && bootm"
> saveenv
> boot

If you want to get back to U-Boot prompt, hold Ctrl-C during reset.

Connection and Logging In

Use the following usernames and passwords to login:

Account with administrative privileges: 

User: root
Password: 111111

Regular user account: 

User: user
Password: 111111

In addition to these accounts CM-X300 allows anonymous FTP access.

See also

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