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The variables RPIFW_SRC_URI and RPIFW_S are created in the common firmware include file so that it is easier to override the firmware source in a local or distro config file. RPIFW_SRC_URI is used to set SRC_URI in firmware.inc as it is common to both bootfiles and vc-graphics. RPIFW_S is used as a prefix for S in bcm2835-bootfiles.bb and vc-graphics.inc as different subdirectories are referenced in each recipe. Signed-off-by: Paul Barker <paul@paulbarker.me.uk>