ELDK on mini2440

The Embedded Linux Development Kit (ELDK) includes the GNU cross development tools, such as the compilers, binutils, gdb, etc.support different Target architecture including arm.

Download link
http://www.denx.de/wiki/DULG/ELDKAvailability


Creating enviroment on host PC.
linuxhost > mkdir eldk
linuxhost > mkdir install_mount
linuxhost > cd eldk/
linuxhost/eldk > su
linuxhost/eldk # mount -o loop,exec ../arm-2007-01-21.iso ../install_mount/
linuxhost/eldk # exit


linuxhost/eldk > ls ../install_mount/
. arm ELDK_FIXOWNER etc install RPMS tools
.. common ELDK_MAKEDEV icons README.html sys version


linuxhost/eldk > ../install_mount/install arm
linuxhost/eldk > chmod u+x eldk_init

now unmount the ISO image as root

linuxhost/eldk > ./eldk_init arm
export these variable to environment,or include them as part of .bashrc file.
ARCH=arm
CROSS_COMPILE=arm-linux-
DEPMOD=/opt/eldk/usr/bin/depmod.pl
PATH=/opt/eldk/usr/bin:/opt/eldk/bin


Using ELDK for mini2440

compiling the Kernel...
Error found while compiling the kernel
kernel/bounds.c:1: error: invalid ABI option: -mabi=aapcs-linux
Fix is to un select Kernel Features ---> [ ] Use the ARM EABI to compile the kernel
Now do make in kernel source,the kernel is successfully build on ELDK.

Building the Root file system
untar the root_qtopia.tar.gz which is available on CD.
cd root_qtopia
rm bin sbin lib usr -rf
cp /opt/ELDK/arm/lib . rf

BusyBox combines tiny versions of many common UNIX utilities into a single small executable,I have used busybox-1.16.0 for my filesystem.
compilation is very straightforward. make menuconfig,
In BusyBox Settings -->Build Options , use 'arm-linux-' as cross compiler prefix.
In Installation Options-> , update the BusyBox Installation prefix
busybos build will create 'bin','sbin','usr' folders in its installation folder.
copy these folders to root_qtopia/
cp /{bin,sbin,usr} root_qtopia/ -rf

now yaffs2 image for root_qtopia and upload it to mini2440 board.

mkyaffs2image root_qtopia rootfs.img

QT Media Player on mini2440

To run the media player example in QT we require cross-compile Gstreamer as back-end

cross compiling gstreamer was made comparatively easy for me,thanks to Mr. Felipe Contreras blog.

This is the link to his blog.

http://felipec.wordpress.com/2009/12/21/gstreamer-development-in-embedded-with-sbox2

For my board mini2440 I cross compiled the following source and installed in "/opt/gst" in my root filesystem.

• glib
• gstreamer
• liboil
• gst-plugin-base
• gst-plugin-good
• gst-plugin-ugly

Now you cross compile QT4.6 with phonon enabled,and linking the gstreamer library.

export PKG_CONFIG_PATH=/opt/gst/lib/pkgconfig

./configure -prefix /opt/qt-4.6/build -debug -shared -fast -pch -no-qt3support -qt-sql-sqlite -no-libtiff -no-libmng -qt-libjpeg -qt-zlib -qt-libpng -qt-freetype -no-openssl -nomake examples -nomake demos -nomake tools -optimized-qmake -no-nis -no-opengl -no-cups -no-xcursor -no-xfixes -no-xrandr -no-xrender -no-xkb -no-feature-CURSOR -no-sm -no-xinerama -no-xshape -webkit -no-separate-debug-info -xplatform qws/linux-arm-g++ -embedded arm -depths 16 -no-qvfb -qt-gfx-linuxfb -no-gfx-qvfb -no-kbd-qvfb -no-mouse-qvfb -qt-kbd-tty -confirm-license -qt-mouse-tslib -phonon -I /opt/gst/lib/glib-2.0/include -I /opt/gst/include/glib-2.0 -I /opt/gst/include/gstreamer-0.10/gst -L /opt/gst/lib -L /opt/gst/lib/gstreamer-0.10 -force-pkg-config -v

After doing 'make install' the libraries are installed on '/opt/qt-4.6/build'

create '/opt/qt-4.6/build' in mini2440 filesystem copy QT related libraries.

create '/opt/gst/lib' in mini2440 copy the contents of the '/opt/gst/lib' on PC to mini2440 filesystem's '/opt/gst/lib'

once this is done cross compile the QT MediaPlayer example in QT Source tree, and copy it on the board and run it.

please don't forget to update the 'LD_LIBRARY_PATH' in the environment variable.

export LD_LIBRARY_PATH=$QTDIR/lib:/opt/gst/lib

Please see my previous blog on crosscompiling QT for mini2440 board for details.

Adding new driver on Linux2.6.30 source tree

Introduction:

This section deals with adding new driver onto the Linux source tree,I have added Lumidigm Venus Driver as character driver.

step 1: copy the driver source code(vcom.c) and into character folder of Linux source tree.

step 2: Edit the Kconfig file in the char folder and add the following line.
config LUMIDIGM
bool "Limidigm fingerprint USB driver"
depends on ARCH_S3C2440
default m if ARCH_S3C2440
help
say Y here to select,otherwise say N.
The Above configuration will give the option to the user for select/deselect Lumidigm driver,for S3C2440 Architecture with default as driver selected.
And help will display "say Y here to select,otherwise say N."

step 3: Edit Makefile in the char folder and add the following line
obj-$(CONFIG_LUMIDIGM) += vcom.o
prefix "CONFIG_" before "LUMIDIGM" flag as set in KConfig file.
save the configuration and do a menuconfig to verify the changes.

on menuconfig we will see the "[*] Limidigm fingerprint USB driver" in Device Drivers ---> Character devices --->