CONFIG_CPU_SUBTYPE_SH7751 is not available for thedefaultarchitecture x86.
Result is shown for architecture sh
SH7751/SH7751R
modulename: setup-sh7750.ko
and/orpci-sh7751.ko
configname: CONFIG_CPU_SUBTYPE_SH7751
Processor subtype
└─>SH7751/SH7751R
In linux kernel since version 2.6.12
Select SH7751 if you have a 166 Mhz SH-4 HD6417751 CPU,
or if you have a HD6417751R CPU.
or if you have a HD6417751R CPU.