CONFIG_CPU_SUBTYPE_SH7751R is not available for thedefaultarchitecture x86.
Result is shown for architecture sh
Support SH7751R processor
modulename: pci-sh7751.ko
and/orsetup-sh7750.ko
configname: CONFIG_CPU_SUBTYPE_SH7751R
Linux Kernel Configuration
└─>Processor selection
└─>Support SH7751R processor