raid drives not detected at installation on Proliant ml350p

When installing SLES 11 SP1 or SP2 on the Proliant ML350p Gen8 server the raid volume is not detected. I can only choose the iLO partition as install partition. I downloaded and installed the latest firmware and also the Proliant boot kit ISO. Booting is OK but no raid devices detected for the P420i SAS controller.

I followed the instructions for the installation but seem to be missing something.
Do I need to set any boot options for this to work or is there a alternative procedure for installation.

Please help.

You’ve posted in the SLED forum. You’ll probably get better responses on the SLES forum.