CONFIG_HDPU is not available for thedefaultarchitecture x86.
Result is shown for architecture ppc

Sky-HDPU

modulename: pci_auto.ko

and/or

hdpu.ko

configname: CONFIG_HDPU

Machine Type
└─>Sky-HDPU
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Select HDPU if configuring a Sky Computers Compute Blade.

source code: