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5 	  UBI is a software layer above MTD layer which admits of LVM-like
6 	  logical volumes on top of MTD devices, hides some complexities of
19 	  erase counter value and the lowest erase counter value of eraseblocks
20 	  of UBI devices. When this threshold is exceeded, UBI starts performing
21 	  wear leveling by means of moving data from eraseblock with low erase
26 	  However, in case of MLC NAND flashes which typically have eraseblock
28 	  to 128 or 256, although it does not have to be power of 2).
37 	  flash does not admit of bad eraseblocks (e.g. NOR flash), this value
40 	  NAND datasheets often specify the minimum and maximum NVM (Number of
44 	  (MaxNVB is basically the total count of eraseblocks on the chip).
47 	  about 1.9% of physical eraseblocks for bad blocks handling. And that
48 	  will be 1.9% of eraseblocks on the entire NAND chip, not just the MTD
51 	  MTD partitions of the same size, UBI will reserve 40 eraseblocks when
67 	   in nearly constant time. Instead of scanning the whole MTD device it
84 	   devices on top of UBI volumes: for each UBI volumes an MTD device is
87 	   work on top of UBI. Do not enable this unless you use legacy
91 	bool "Read-only block devices on top of UBI volumes"
96 	   devices will be layered on top of UBI volumes, which means that the
98 	   bit-flips. You can put any block-oriented file system on top of UBI