I finally got it to work.
It tried all firmwares I could find on the intel homepage.
This one was the only one that worked:
IR3_2008SASHWR_FWPKG-v20.10.1-0107 (fw: 2.130.354-1664)
After flashing the controller with this fw, windows 7 ultimate (64) immediatly found the controller.
With this the code (10) problem has been resolved for me.
Btw: this fw from the intel homepage is corrupted:
ir3_2008SASHWR_Firmware_v2.40.04-0787_Pkg_v20.2.1-0006
I almost got an heartattack when I read failure corrupted fw!
Here is a compatibility list for tested fw with os:
http://www.intel.com/support/motherboards/server/sb/CS-031393.htm
Although you won't find most of the fw in the download section.
Regards,
A