README: Describe CONFIG_SYS_NO_FLASH
Unlike most configuration options defining this actually disables support for a feature (parallel flash). Eventually the logic behind this should probably be flipped so that '#ifndef CONFIG_SYS_NO_FLASH' becomes '#ifdef CONFIG_HAS_PARALLEL_FLASH' but for now lets document the existing behaviour. Signed-off-by: NChris Packham <judge.packham@gmail.com> Reviewed-by: NStefan Roese <sr@denx.de>
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