Qt/Embedded Case Study - Cassiopeia E-100

Compile the application:

    cd examples/notepad
    make
    mipsel-linux-strip notepad

We have chosen to link the application dynamically. While this is important if we plan to run multiple applications, it is a waste of space in an application such as notepad that is supposed to be the only application running. You can link statically by configuring with:

    ./configure -static -xplatform linux-mips-g++ -platform linux-x86-g++

We must install our application and its support files in the ramdisk. Mount the ramdisk using loopback device (you will need loopback device support in your kernel):

    mkdir /mnt/ramdisk
    mount -o loop ~/ramdisk /mnt/ramdisk

Copy the Qt/Embedded library to the ramdisk /lib directory and make the necessary links:

    cd /mnt/ramdisk/lib
    cp $QTDIR/lib/libqt.so.2.2.0 .
    ln -s libqt.so.2.2.0 libqt.so.2.2
    ln -s libqt.so.2.2.0 libqt.so.2

The fonts must be installed in /usr/local/qt-embedded/etc/fonts:

    cd /mnt/ramdisk
    mkdir usr/local
    mkdir usr/local/qt-embedded
    mkdir usr/local/qt-embedded/etc
    mkdir usr/local/qt-embedded/etc/fonts
    cp helvetica_100_50.qlf helvetica_120_50.qlf usr/local/qt-embedded/etc/fonts

When the kernel boots it looks for several files to run. In order to have our application run when the kernel boots, we change its name to /bin/sh. A /tmp directory is also used by Qt/Embedded:

    cp $QTDIR/examples/notepad/notepad /mnt/ramdisk/bin/sh
    mkdir /mnt/ramdisk/tmp
    umount /mnt/ramdisk

Create a ramdisk object, link it with the kernel, copy it to the compact flash and boot Linux. You should see the calibration screen appear on the LCD display.