CONFIG_CPU_SUBTYPE_SH7709 is not available for thedefaultarchitecture x86.
Result is shown for architecture sh
SH7709
modulename: setup-sh770x.ko
configname: CONFIG_CPU_SUBTYPE_SH7709
Processor subtype
└─>SH7709
In linux kernel since version 2.6.12
Select SH7709 if you have a 80 Mhz SH-3 HD6417709 CPU.