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KDE on scratchbox for maemo 4

Revision as of 10:10, 30 December 2009

This article describes how to compile KDE for maemo. It takes the Nokia N810 as example device. It uses the cross-compiling environment scratchbox on an Intel-based computer.

Overview

• maemo is the core software stack that runs on mobile devices like Nokia's N810 or N900
• garage is where the projects for maemo are hosted, somewhat compareable to Sourceforge.
• OS2008 is maemo 4.x (more info). Compare it with Debian's Lenny.
• Diablo is the version (feature upgrade 2008) of maemo.
• Scratchbox is a cross-compiling environment to enable you to create software for maemo on an i386.
• Busybox is a single binary that allows you to run commands like ls, cat and bunzip2
• Hildon is an application framework and desktop shell for maemo, compare it to the role that Plasma plays in KDE 4

On the Nokia itself

• install openssh on the Nokia N810
• install subversion

ssh root@localhost
apt-get install subversion

On your desktop

You cannot install scratchbox on an X64 computer, so, install an i386 into a VMWare virtual machine. The following describes how to install scratchbox into a SUSE 11.1 32bit installation. It might work same or similar with any Linux.

Set up scratchbox

First, we want to compile a "hello world" program for the Nokia. Here is how.

• Set up VMWare Server 2.0
• Install a virtual machine into VMWare Server, 40GB hard drive, 1024 GB RAM
• Install SUSE Linux 11.2 from DVD. At the bootscreen, type F7 and select X86 instead of X86_64. That way, you will get a 32bit operating system.
• Take a VMware SNAPSHOT from your virtual machine so you can revert to this state
• Boot your virtual machine
• Set up scratchbox

root@i386 # useradd -m scratchboxuser
root@i386 # passwd scratchboxuser
root@i386 # wget http://repository.maemo.org/stable/diablo/maemo-scratchbox-install_4.1.2.sh
root@i386 # chmod 777 maemo-scratchbox-install_4.1.2.sh
root@i386 # ./maemo-scratchbox-install_4.1.2.sh -s /scratchbox
root@i386 # /scratchbox/sbin/sbox_adduser scratchboxuser
root@i386 # su - scratchboxuser

• set up the SDK

scratchboxuser@i386 $ wget http://repository.maemo.org/stable/diablo/maemo-sdk-install_4.1.2.sh

Start the install script and accept all choices:

scratchboxuser@i386 $ sh maemo-sdk-install_4.1.2.sh

• start scratchbox

scratchboxuser@i386 $ /scratchbox/login
[sbox-DIABLO_ARMEL: ~] > sb-conf select DIABLO_ARMEL

Re-login

To re-login after a reboot of your virtual machine run

/scratchbox/sbin/sbox_ctl start
/scratchbox/login

Hello world

Now we write the canonical hello world program in C.

[sbox-DIABLO_ARMEL: ~] > cat > main.c << EOF
#include <stdio.h>

int main()
{
  printf("hello world");
}
EOF
[sbox-DIABLO_ARMEL: ~] > gcc main.c
[sbox-DIABLO_ARMEL: ~] > file a.out
a.out: ELF 32-bit LSB executable, ARM, version 1 (SYSV), for GNU/Linux 2.6.8, dynamically linked (uses shared libs), not stripped

• copy the file to your Nokia N810 using scp

=> the file is executable on the Nokia

Install Qt

Now it's time to install qt. Add to your /etc/apt/sources.list:

deb http://repository.maemo.org/extras/ diablo free non-free
deb-src http://repository.maemo.org/extras/ diablo free

and tell the system to re-read it:

apt-get update

install the qt development package:

apt-get install libqt4-dev

verify it has been installed:

ls /usr/include/qt4/
Qt          QtAssistant  QtDBus      QtGui   QtNetwork  QtScriptTools  QtSvg   QtUiTools  QtXml
Qt3Support  QtCore       QtDesigner  QtHelp  QtScript   QtSql          QtTest  QtWebKit   QtXmlPatterns

verify it does not work:

qmake
mmap: Permission denied