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GCC will define __ARM_ARCH_4T__ when building with "-march=armv4t" so we can check this to turn off the use of 'clz' instructions, which otherwise would cause compile errors like "selected processor does not support ARM mode `clz r3,r0'". (From OE-Core rev: 6859e3fc34269620146d26eeecc9b93c3a9d7055) Signed-off-by: Wolfgang Denk <wd@denx.de> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>