CONFIG_NP405H is not available for thedefaultarchitecture x86.
Result is shown for architecture ppc

CONFIG_NP405H (not configurable)

modulename: ibmnp405h.ko

configname: CONFIG_NP405H

Linux Kernel Configuration
└─>IBM 4xx options
└─>NP405H
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
source code:
depends
CONFIG_4xx
CONFIG_ASH