In order to get plain vanilla Debian on this box it looks necessary to create an uImage.
WD is oblidged to publish everything necessary to do that, but unfortunately their cookbook is as buggy as the firmware itself and therefore I have not yet been able to do that.
Imho it would be much easier to cross compile on a PC for the armhf platform, but this did not work for me either.
There has been a single post where someone wrote to have done it, but he did not come online for 3 weeks now.
http://community.wd.com/t5/WD-My-Cloud/WD-My-Cloud-GPL-Source-Code/m-p/688397
