CONFIG_SH_ECOVEC is not available for thedefaultarchitecture x86.
Result is shown for architecture sh

EcoVec

configname: CONFIG_SH_ECOVEC

Linux Kernel Configuration
└─>Board support
└─>EcoVec
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
Renesas "R0P7724LC0011/21RL (EcoVec)" support.