The document discusses Scratchbox, a cross-compilation development environment for open source projects. Scratchbox provides a sandboxed environment that allows compiling code for different CPU architectures like ARM. The maemo SDK is installed inside Scratchbox and provides targets for x86 and ARMEL development. Tools like compilers, debuggers and profilers are available to develop and test code inside the Scratchbox environment. Instructions are provided on installing the Ubuntu-maemo SDK virtual machine to get started with Scratchbox and maemo development.

1. Development Environment Juha Tukkinen / November 2007

2. Content development environment overview how to install tools supported runtimes software porting examples

3. Development environment overview The problem: Open source projects use GNU configure build system a developer creates GNU M4 macros configure script gets generated by GNU Automake and GNU Autoconf … which produce Makefile s and a config.h

4. Development environment overview So what’s wrong with this? configure assumes that the target environment will be the same as the compilation host environment compilation natively on an Internet Tablet is not… optimal

5. Development environment overview A solution: Scratchbox a cross-compilation environment a sandbox put together by wrappers, black magic and symbolic links makes use of QEMU as a machine emulator (not as a virtualizer)

6. Scratchbox

7. Scratchbox and maemo SDK Scratchbox provides a sandboxed cross-compilation development environment ( chroot on steroids) maemo SDK is installed inside Scratchbox maemo SDK provides two targets for Scratchbox: X86 used for active development ARMEL for cross-compilation, QEMU also provides CPU transparency maemo SDK also provides closed Nokia binaries separately

8. Scratchbox under the hood target : has a root file system, uses a toolchain devkit : tools native to host toolchain : compiler, linker, binutils… rootstrap : root file system for the target device CPU transparency (cputransp devkit) maemo SDK provides two preconfigured targets: SDK_X86 and SDK_ARMEL

9. Tools inside Scratchbox (to list some) GNU toolchain for ARM processors debugger: gdb tracing tools: strace, ltrace valgrind: suite of tools for debugging and profiling memcheck – memory management detector cachegrind – cache profiler callgrind – extra information of call graphs to the above massif – heap profiler helgrind – thread debugger

10. How to install maemo SDK SDK depends on Scratchbox that is only available for Linux installer script installs both Scratchbox and SDK alternative solution: VMWare image can be used also in Windows Ubuntu Linux Desktop with maemo SDK installed do not get confused: you run a virtualized Linux PC inside a Windows operating system and inside the virtualized Linux you run Scratchbox

11. Supported runtimes official supported language is C Python C++ C# through Mono Java Ruby … ITOS has Gecko 1.9 and Flash 9: “Web 2.0” runtime

12. Hacking session – see README.TXT Install VMware player Unzip Ubuntu-maemo-sdk.zip Start the virtual Ubuntu Gutsy Desktop Start Xephyr (the spring icon in the top toolbar) Start a Terminal Start Scratchbox by typing scratchbox Start the application framework: af-sb-init.sh start Change targets (SDK_X86 and SDK_ARMEL) with sb-menu /scratchbox/users/maemo/home/maemo (outside) /home/maemo (inside Scratchbox)

13. Hacking session – things to try install “xterm” and “ssh server” on the N800 http://maemo.org/download Compile maemo-examples in SDK_X86 make Run some maemo-examples in SDK_X86 run-standalone.sh ./example Compile maemo-examples in SDK_ARMEL Run some examples in SDK_ARMEL Copy binaries to N800 and run them there Examine and try out examples, dosbox and frodo Try out the python environment python2.5

14. Thank you!