CONFIG_CPU_SUBTYPE_SH7091 is not available for thedefaultarchitecture x86.
Result is shown for architecture sh
Support SH7091 processor
modulename: setup-sh7750.ko
configname: CONFIG_CPU_SUBTYPE_SH7091
Linux Kernel Configuration
└─>Processor selection
└─>Support SH7091 processor
In linux kernel since version 2.6.16 (release Date: 2006-03-19)
Select SH7091 if you have an SH-4 based Sega device (such as
the Dreamcast, Naomi, and Naomi 2).
the Dreamcast, Naomi, and Naomi 2).