Is this problem known here ?
What can i do to fix it ?
I don't think it's a known problem at all. I have a Mac Pro 1,1 with 2,1 firmware and it "just" works with Tiamo's boot.efi. My case, however, might be somewhat atypical, as I migrated to Tiamo's boot.efi from a previous Chameleon setup, meaning my Mavericks install was done according to the most widespread Chameleon method, which is similar to Tiamo's but not exactly the same. When I learned about Tiamo's hack, I simply copied his boot.efi to a couple of locations, blessed the Mavericks disk and got rid of the Chameleon setup.
Other than suggesting that you repair permissions, I have no idea how you can get your system out of that boot loop.