It’s an XScale alright.
Maybe this article http://linuxdevices.com/articles/AT3184179979.html can help shed some light, too.
I am also considering getting a RAID-5 capable NAS, and I have done some research previously. Cheers for bookmarks-archive! 🙂
Although in german, this site provides the necessary steps to get a cross-compile-environment going:
http://www.fbis.ch/index-de.php?page=18&frameset=4
The part of how to set up that toolchain is also available in english here:http://people.debian.org/~debacle/cross/
You need to get the toolchain for “arm-linux” to be able to compile for the SS4000.
Enjoy!