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Specifying -mspe=no also disables usage of SPE instructions. It is documented in "[PATCH,rs6000] make -mno-spe work as expected" email: http://gcc.gnu.org/ml/gcc-patches/2008-04/msg00311.html So replace -mspe=yes by -mspe=no, so make it clear that u-boot has to be compiled without SPE instructions. Linux kernel contains following Makefile code to achieve it: # No SPE instruction when building kernel # (We use all available options to help semi-broken compilers) KBUILD_CFLAGS += $(call cc-option,-mno-spe) KBUILD_CFLAGS += $(call cc-option,-mspe=no) Do same for U-Boot. Signed-off-by: Pali Rohár <pali@kernel.org>