ArchLinux have non official support of ARM architecture. Documentation are available on archlinuxarm.org.

To proceed to the ArchLinux intall you need a shell on your NAS. One way to achieve this is to boot on an initramfs.

• To build your own Initramfs you'll find some documentation on the dedicated page : Build An initramfs.
• Once you succefully build your initramfs, use clunc to boot on it.

Your initramfs will need to include an fdisk tool to edit partition and an mkfs tool ( with the support of the fs of your choice ) to create filesystem.

A base system tarball can be downloaded and install :

wget http://archlinuxarm.org/os/ArchLinuxARM-armv5te-latest.tar.gz
tar xzvf ArchLinuxARM-armv5te-*.tar.gz