Examples:
U-Boot v2009.11 - Release November 2009
U-Boot v2009.11.1 - Release 1 in version November 2009 stable tree
- U-Boot v2010.09-rc1 - Release candiate 1 for September 2010 release
+ U-Boot v2010.09-rc1 - Release candidate 1 for September 2010 release
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