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 (2011-09-22)

• Kernel configuration for DHCOM iMX25 Linux (2011-09-22)

How to build a kernel:

1. Start the Console on Linux
2. $ tar xfjv linux-2.6.38.tar.bz2
3. $ cd /kernel/path
4. $ patch -p1 <linux-2.6.38_DHCOM_iMX25.patch
5. $ cp .config /kernel/path
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 (2011-09-22)

1. Copy the "uImage" and "uImage.env" file onto a SD-card with a FAT file system
2. Insert the SD-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 (2011-12-08)

1. Format a SD card with ext3 file system e.g. you can use palimpsest
   $ palimpsest
2. Copy root file system onto the SD card
   Start the Console on Linux
   $ su
   $ chmod 755 /path/of/the/SD-card
   $ cd /path/of/the/SD-card
   $ tar xfjv Name_of_RootFS_file.tar.bz2

How to control the display brightness

$ echo <value> >/sys/class/leds/pwm:out/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

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