Using more than 4 GB RAM on Debian etch 32bit

By default Debian etch 32bit allows a maximum of 4 GB RAM. The limit can be raised up to 64 GB with a single apt-get command / kerenl update:

apt-get install linux-image-2.6-686-bigmem

That's it, reboot your system and you will be able to install up to 64GB of RAM to your system.