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Xilinx Spartan-3AN FPGAs contain an In-System Flash where they keep their configuration data and (optionally) some user data. The protocol of this flash follows most of the spi-nor standard. With the following differences: - Page size might not be a power of two. - The address calculation (default addressing mode). - The spi nor commands used. Protocol is described on Xilinx User Guide UG333 Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> Cc: Boris Brezillon <boris.brezillon@free-electrons.com> Cc: Brian Norris <computersforpeace@gmail.com> Cc: Marek Vasut <marek.vasut@gmail.com> Reviewed-by: Marek Vasut <marek.vasut@gmail.com> Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>