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Previously we use the file time stamp to judge if a cache is valid. Here this commit introduce a new method, which calculates the total hash value for a certain configuration's key/value paris, and tag it into cache filename, for example, bb_cache.dat.xxxyyyzzz. This mechanism also ensures the cache's correctness if user dynamically setting variables from some frontend GUI, like HOB. (Bitbake rev: 1c1df03a6c4717bfd5faab144c4f8bbfcbae0b57) Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>