CONFIG_ARCH_THEAD is not available for the selected architecture x86.
Result is shown for architecture riscv
T-HEAD RISC-V SoCs
configname: CONFIG_ARCH_THEAD
Linux Kernel Configuration
└─>SoC selection
└─>T-HEAD RISC-V SoCs
In linux kernel since version 4.14.326 (release Date: 2023-09-23)
This enables support for the RISC-V based T-HEAD SoCs.