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1 # SPDX-License-Identifier: GPL-2.0-only
3 tristate "Enable UBI - Unsorted block images"
6 UBI is a software layer above MTD layer which admits use of LVM-like
10 (www.linux-mtd.infradead.org).
15 int "UBI wear-leveling threshold"
19 This parameter defines the maximum difference between the highest
26 other flashes which have eraseblock life-cycle 100000 or more.
28 life-cycle less than 10000, the threshold should be lessened (e.g.,
44 as "1024 * (1 - MinNVB / MaxNVB)", which gives 20 for most NANDs
55 This option can be overridden by the "mtd=" UBI module parameter or
64 Important: this feature is experimental so far and the on-flash
70 The on-flash fastmap contains all information needed to attach
73 a fastmap on old images, but you can set the UBI module parameter
74 fm_autoconvert to 1 if you want so. Please note that fastmap-enabled
84 This option enables gluebi - an additional driver which emulates MTD
87 volume. This is handy to make MTD-oriented software (like JFFS2)
92 bool "Read-only block devices on top of UBI volumes"
96 This option enables read-only UBI block devices support. UBI block
99 bit-flips. You can put any block-oriented file system on top of UBI
100 volumes in read-only mode (e.g., ext4), but it is probably most
101 practical for read-only file systems, like squashfs.
112 This option enables fault-injection support for UBI devices for
124 specification and used to store also e.g. MAC addresses or board-
125 specific Wi-Fi calibration data.