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The kendryte PLL code uses nop as barrier. The macro is not defined for the sandbox on x86 but is defined on RISC-V. Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de> Reviewed-by: Sean Anderson <seanga2@gmail.com> Reviewed-by: Bin Meng <bin.meng@windriver.com>