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On devices with non-uniform sector sizes like Spansion S25 or S28 family of flashes the sector under erase does not necessarily have to be mtd->erasesize bytes long. For example, on S28 flashes the first 128 KiB region is composed of 32 4 KiB sectors, then a 128 KiB sector, and then 256 KiB sectors till the end. Let the flash-specific erase functions erase less than the requested length in case of the 4 or 128 KiB sectors and report the number of bytes erased back to the calling function. Signed-off-by: Pratyush Yadav <p.yadav@ti.com> Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>