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A cprintf could increase 96+ bytes of stack usage and may overflow the stack of idle task, which is 256 bytes on stm32. BUG=chrome-os-partner:23982 BRANCH=nyan TEST=verified on nyan Change-Id: If96a1c51010116a2b4f3d67481ec0acc7bf78dd9 Signed-off-by: Louis Yung-Chieh Lo <yjlou@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/176619 Reviewed-by: Vincent Palatin <vpalatin@chromium.org>