NAND_BBT_NRBITS_MSK   59 include/linux/mtd/bbm.h #define NAND_BBT_NRBITS_MSK	0x0000000F
NAND_BBT_NRBITS_MSK  514 include/linux/mtd/nand.h #define NAND_BBT_NRBITS_MSK	0x0000000F