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If tune-corei7 is in use then the target binaries may contain instructions that qemu-x86-64 can't execute by default, resulting in errors on rootfs construction: NOTE: Running intercept scripts: NOTE: > Executing update_font_cache intercept ... qemu: uncaught target signal 4 (Illegal instruction) - core dumped In this case the instruction is popcnt, part of SSE4.2, so tell Qemu to emulate the CPU that the tune targets (in this case, Nehalem). Also pass check=false as the Nehalem machine supports VME but user-space qemu doesn't, which produces a warning unless CPUID checking is disabled. [ YOCTO #8888 ] (From OE-Core rev: fef106b9b97ec48bad2b9a084357b884f653d6c8) Signed-off-by: Ross Burton <ross.burton@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>