config BR2_PACKAGE_MSR_TOOLS bool "msr-tools" depends on BR2_i386 || BR2_x86_64 help The MSR Tools project provides utilities to access x86 processor MSRs and CPU ID directly. Those tools access the hardware through the /dev/cpu//msr and /dev/cpu//cpuid devices. This necessitates msr and cpuid support in the kernel, which means you need a kernel compiled with configuration options CONFIG_X86_CPUID and CONFIG_X86_MSR enabled. https://01.org/msr-tools