CONFIG_SBC834x is not available for thedefaultarchitecture x86.
Result is shown for architecture powerpc

Wind River SBC834x

modulename: sbc834x.ko

configname: CONFIG_SBC834x

Linux Kernel Configuration
└─>83xx Board Type
└─>Wind River SBC834x
In linux kernel since version 2.6.25 (release Date: 2008-04-16)  
This option enables support for the Wind River SBC834x board.

source code: