The boot process is interrupted and I cannot mount root fs.
Probably you have the older SDK version 20081118 and then want to upgrade to the latest SDK 20090205. Please proceed as described in the getting started manual chapter 7.5: Changing NVRAM kernel command line settings. We already implement this modification in the NVRAM in all current mvXCell-8i boards. Your card was preconfigured for the older SDK, which does not include the NVRAM modifications.