CONFIG_DEBUG_RCAR_GEN2_SCIF4 is not available for thedefaultarchitecture x86.
Result is shown for architecture arm
Kernel low-level debugging messages via SCIF4 on R8A7745
configname: CONFIG_DEBUG_RCAR_GEN2_SCIF4
Kernel low-level debugging port
└─>Kernel low-level debugging messages via SCIF4 on R8A7745
In linux kernel since version 4.2 (release Date: 2015-08-30)
Say Y here if you want kernel low-level debugging support
via SCIF4 on Renesas RZ/G1E (R8A7745).
via SCIF4 on Renesas RZ/G1E (R8A7745).