1menuconfig MTD_UBI
2	tristate "Enable UBI - Unsorted block images"
3	select CRC32
4	help
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
7	  flash chips like wear and bad blocks and provides some other useful
8	  capabilities. Please, consult the MTD web site for more details
9	  (www.linux-mtd.infradead.org).
10
11if MTD_UBI
12
13config MTD_UBI_WL_THRESHOLD
14	int "UBI wear-leveling threshold"
15	default 4096
16	range 2 65536
17	help
18	  This parameter defines the maximum difference between the highest
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
22	  counter to eraseblocks with high erase counter.
23
24	  The default value should be OK for SLC NAND flashes, NOR flashes and
25	  other flashes which have eraseblock life-cycle 100000 or more.
26	  However, in case of MLC NAND flashes which typically have eraseblock
27	  life-cycle less than 10000, the threshold should be lessened (e.g.,
28	  to 128 or 256, although it does not have to be power of 2).
29
30config MTD_UBI_BEB_RESERVE
31	int "Percentage of reserved eraseblocks for bad eraseblocks handling"
32	default 1
33	range 0 25
34	help
35	  If the MTD device admits of bad eraseblocks (e.g. NAND flash), UBI
36	  reserves some amount of physical eraseblocks to handle new bad
37	  eraseblocks. For example, if a flash physical eraseblock becomes bad,
38	  UBI uses these reserved physical eraseblocks to relocate the bad one.
39	  This option specifies how many physical eraseblocks will be reserved
40	  for bad eraseblock handling (percents of total number of good flash
41	  eraseblocks). If the underlying flash does not admit of bad
42	  eraseblocks (e.g. NOR flash), this value is ignored and nothing is
43	  reserved. Leave the default value if unsure.
44
45config MTD_UBI_GLUEBI
46	tristate "MTD devices emulation driver (gluebi)"
47	help
48	   This option enables gluebi - an additional driver which emulates MTD
49	   devices on top of UBI volumes: for each UBI volumes an MTD device is
50	   created, and all I/O to this MTD device is redirected to the UBI
51	   volume. This is handy to make MTD-oriented software (like JFFS2)
52	   work on top of UBI. Do not enable this unless you use legacy
53	   software.
54
55config MTD_UBI_DEBUG
56	bool "UBI debugging"
57	depends on SYSFS
58	select DEBUG_FS
59	select KALLSYMS
60	help
61	  This option enables UBI debugging.
62
63endif # MTD_UBI
64