Linaro uses SPDX License Identifiers in their License files http://git.denx.de/?p=u-boot.git;a=blob;f=post/post.c;h=4af5355fa5a20f9c2e763f37b269bea38d43e8ea;hb=6612ab33956ae09c5ba2fde9c1540b519625ba37
