CONFIG_HCU4 is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Hcu4

modulename: hcu4.ko

configname: CONFIG_HCU4

Linux Kernel Configuration
└─>Hcu4
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
This option enables support for the Nestal Maschinen HCU4 board.

source code:
selects
CONFIG_405GPR

depends
CONFIG_40x