CONFIG_CPU_SUBTYPE_SH7750 is not available for thedefaultarchitecture x86.
Result is shown for architecture sh
Support SH7750 processor
modulename: setup-sh7750.ko
configname: CONFIG_CPU_SUBTYPE_SH7750
Linux Kernel Configuration
└─>Processor selection
└─>Support SH7750 processor
In linux kernel since version 2.6.12
Select SH7750 if you have a 200 Mhz SH-4 HD6417750 CPU.