CONFIG_SH_LBOX_RE2 is not available for thedefaultarchitecture x86.
Result is shown for architecture sh
L-BOX RE2
modulename: fixups-rts7751r2d.ko
configname: CONFIG_SH_LBOX_RE2
Linux Kernel Configuration
└─>Board support
└─>L-BOX RE2
In linux kernel since version 2.6.22 (release Date: 2007-07-08)
Select L-BOX RE2 if configuring for the NTT COMWARE L-BOX RE2.