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Both MMC and SD specifications specify (although a bit unclearly in the MMC case) that a sector size of 512 bytes must always be supported by the card. Cards can report larger "native" size than this, and cards >= 2 GB even must do so. Most other readers use 512 bytes even for these cards. We should do the same to be compatible. Signed-off-by: Pierre Ossman <drzeus@drzeus.cx> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>