CONFIG_4xx is not available for thedefaultarchitecture x86.
Result is shown for architecture ppc

CONFIG_4xx (not configurable)

modulename: uic.ko

configname: CONFIG_4xx

Linux Kernel Configuration
└─>4xx
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
source code:
arch/powerpc/sysdev/uic.c
depends
CONFIG_40x or CONFIG_44x