You can use the IBM® Advanced Settings Utility (ASU) to modify firmware settings from the command line on multiple operating-system platforms like DOS, Linux, Solaris, Windows (yes also WinPE).

It supports BIOS code, Remote Supervisor Adapter firmware, Remote Supervisor Adapter II firmware and Baseboard management controller firmware 

You can perform the following tasks by using the utility:

• Modify the basic input/output system (BIOS) CMOS settings without the need to restart the system to access F1 settings
• Issue selected baseboard management controller setup commands
• Issue selected Remote Supervisor Adapter and Remote Supervisor Adapter II setup commands

The ASU supports scripting environments through its batch-processing mode.

Readme:  ftp://ftp.software.ibm.com/systems/support/system_x_pdf/46m1352.pdf
Files:  http://www-304.ibm.com/systems/support/supportsite.wss/docdisplay?lndocid=MIGR-55021&brandind=5000008