default or selected kernelversion does not have config value CONFIG_ARCH_R9A09G056.
Result is shown for kernelversion 6.16-rc7
ARM64 Platform support for RZ/V2N
configname: CONFIG_ARCH_R9A09G056
Linux Kernel Configuration
└─>Device Drivers
└─>SOC (System On Chip) specific Drivers
└─>Renesas SoC driver support
└─>ARM64 Platform support for RZ/V2N
In linux kernel since version 6.1.145 (release Date: 2025-07-14)
This enables support for the Renesas RZ/V2N SoC variants.