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If a board has a variable number of flash banks, there are empty entries in flash_info[] and CFG_DIRECT_FLASH_TFTP is set, tftp boot fails with "Outside available Flash". This patch skips flash banks with unknown flash ids. Signed-off-by: Jochen Friedrich <jochen@scram.de> Signed-off-by: Ben Warren <biggerbadderben@gmail.com>