"-u" is only for GNU cp. Cp of BSD and Solaris don't take this option. It is not necessary to compare the files before copying. Change-Id: I60cf57991275db0e075278f77a95ca5b8b941c7f Signed-off-by: Zheng Bao <zheng.bao@amd.com> Signed-off-by: Zheng Bao <fishbaozi@gmail.com> Reviewed-on: http://review.coreboot.org/11601 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com>