CONFIG_SOC_SIFIVE is not available for thedefaultarchitecture x86.
Result is shown for architecture riscv

SiFive SoCs

configname: CONFIG_SOC_SIFIVE

Linux Kernel Configuration
└─>SoC selection
└─>SiFive SoCs
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
This enables support for SiFive SoC platform hardware.


is selected by
CONFIG_PCIE_FU740