COM iMX25 Linux

Linux virtual machine for development

Get the Virtual machine

• Get the VMware player

• Debian Squeeze VMware Image (zipx Archiv)
  Password for devel user: devel
  Password for root user: root

History:

v1.1 - Debian Squeeze v1.1.zipx    - Update Eclipse to Indigo with CDT 8.0
                                   - Add demo project "crosshelloworld"

v1.0 - Debian Squeeze.zipx         - First release

Setting up a Eclipse Cross Executable Project:

• Use Eclipse Indigo (version 3.7.1) for your project.
• Create a new C++ Project and choose as Executable Project type "Cross-Compile Project" and as Toolchains "Cross GCC"
• Click the Button "Next" and specify under "Tool command path" the Toolchain path. For Codesourcery it is the folder "CodeSourcery/Sourcery_G++_Lite/bin". Under Prefix type "arm-none-linux-gnueabi-".

Building your own Kernel

Sources for the iMX25 Kernel:

• Kernel version: 2.6.38 from www.kernel.org

• Patch to DHCOM iMX25 Linux (2012-02-02)

• Kernel configuration for DHCOM iMX25 Linux (2012-02-02)

How to build a kernel:

1. Start the Console on Linux
2. $ tar xfjv linux-2.6.38.tar.bz2 (in work_path)
3. $ cd /work_path/linux-2.6.38
4. $ patch -p1 <linux-2.6.38_DHCOM_iMX25.patch
5. $ cp .config /work_path/linux-2.6.38
6. $ ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- make uImage

The uImage file will you find in ../build-linux/arch/arm/boot

Update the kernel with U-Boot

You can update the linux kernel with U-Boot flash update.

• Current built of the 2.6.38 DHCOM iMX25 linux kernel (2012-02-02)

1. Copy the "uImage" and "uImage.env" file onto a microSD card with a FAT file system (you can use the 1st partition on the microSD card)
2. Insert the microSD card and start the system
3. Go to the U-Boot console by pressing <Return> on a RS232 terminal (during startup)
4. $ update linux

How to use/update our root file system

• Current Debian root file system (2012-02-03)

Login data for the Debian system

1. Format a microSD card like following (in linux e.g. you can use palimpsest)
   MBR partition scheme
   P1 FAT  (Primary partition: 100MB)
   P2 ext3 (Primary partition: Residual space)
2. Copy root file system onto the ext3 partition of the microSD card
   Start the Console on Linux
   $ su
   $ chmod 755 /path/of/the/microSD card
   $ cd /path/of/the/microSD card
   $ tar xfjv Name_of_RootFS_file.tar.bz2

How to control the display brightness

$ echo <value> >/sys/devices/platform/imx-fb.0/backlight/imxfb-bl/brightness

value range: 0..255

Debian system

Calibrating the touchscreen

$ TSLIB_TSDEVICE=/dev/input/event0 ts_calibrate

Running example Qt Apps

$ QWS_MOUSE_PROTO=Tslib:/dev/input/event0 /usr/qt/demos/demoname/demoname -qws
For the Qt-Browser change demoname to browser

Login/Shutdown system

Login:
  Name:     root
  password: foo

Shutdown:
  $ shutdown -h now

Initialize and test CAN

Initialize:
  $ ip link set can0 up type can bitrate 500000

Send test message via cansend (part of can-utils):
  $ cansend can0 100#11.2233.44556677.88

Busybox system

Calibrating the touchscreen

$ TSLIB_TSDEVICE=/dev/event0 ts_calibrate

Running example Qt Apps

$ QWS_MOUSE_PROTO=Tslib:/dev/event0 /usr/qt/demos/demoname/demoname -qws
For the Qt-Browser change demoname to browser

Login/Shutdown system

Login:
  Name:     root
  password: n/a

Shutdown:
  $ halt