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1# drivers/mtd/ubi/Kconfig
2
3menu "UBI - Unsorted block images"
4 depends on MTD
5
6config MTD_UBI
7 tristate "Enable UBI"
8 depends on MTD
9 select CRC32
10 help
11 UBI is a software layer above MTD layer which admits of LVM-like
12 logical volumes on top of MTD devices, hides some complexities of
13 flash chips like wear and bad blocks and provides some other useful
14 capabilities. Please, consult the MTD web site for more details
15 (www.linux-mtd.infradead.org).
16
17config MTD_UBI_WL_THRESHOLD
18 int "UBI wear-leveling threshold"
19 default 4096
20 range 2 65536
21 depends on MTD_UBI
22 help
23 This parameter defines the maximum difference between the highest
24 erase counter value and the lowest erase counter value of eraseblocks
25 of UBI devices. When this threshold is exceeded, UBI starts performing
26 wear leveling by means of moving data from eraseblock with low erase
27 counter to eraseblocks with high erase counter. Leave the default
28 value if unsure.
29
30config MTD_UBI_BEB_RESERVE
31 int "Percentage of reserved eraseblocks for bad eraseblocks handling"
32 default 1
33 range 0 25
34 depends on MTD_UBI
35 help
36 If the MTD device admits of bad eraseblocks (e.g. NAND flash), UBI
37 reserves some amount of physical eraseblocks to handle new bad
38 eraseblocks. For example, if a flash physical eraseblock becomes bad,
39 UBI uses these reserved physical eraseblocks to relocate the bad one.
40 This option specifies how many physical eraseblocks will be reserved
41 for bad eraseblock handling (percents of total number of good flash
42 eraseblocks). If the underlying flash does not admit of bad
43 eraseblocks (e.g. NOR flash), this value is ignored and nothing is
44 reserved. Leave the default value if unsure.
45
46config MTD_UBI_GLUEBI
47 bool "Emulate MTD devices"
48 default n
49 depends on MTD_UBI
50 help
51 This option enables MTD devices emulation on top of UBI volumes: for
52 each UBI volumes an MTD device is created, and all I/O to this MTD
53 device is redirected to the UBI volume. This is handy to make
54 MTD-oriented software (like JFFS2) work on top of UBI. Do not enable
55 this if no legacy software will be used.
56
57source "drivers/mtd/ubi/Kconfig.debug"
58endmenu