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We used to have fixed parameters for soldered DDR chips. This patch introduces CONFIG_SYS_DDR_RAW_TIMING to enable calculation based on timing data from DDR chip datasheet, implemneted in board-specific files or header files. Signed-off-by: York Sun <yorksun@freescale.com> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>