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What: /sys/class/ubi/
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
The ubi/ class sub-directory belongs to the UBI subsystem and
provides general UBI information, per-UBI device information
and per-UBI volume information.
What: /sys/class/ubi/version
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
This file contains version of the latest supported UBI on-media
format. Currently it is 1, and there is no plan to change this.
However, if in the future UBI needs on-flash format changes
which cannot be done in a compatible manner, a new format
version will be added. So this is a mechanism for possible
future backward-compatible (but forward-incompatible)
improvements.
What: /sys/class/ubiX/
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
The /sys/class/ubi0, /sys/class/ubi1, etc directories describe
UBI devices (UBI device 0, 1, etc). They contain general UBI
device information and per UBI volume information (each UBI
device may have many UBI volumes)
What: /sys/class/ubi/ubiX/avail_eraseblocks
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Amount of available logical eraseblock. For example, one may
create a new UBI volume which has this amount of logical
eraseblocks.
What: /sys/class/ubi/ubiX/bad_peb_count
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Count of bad physical eraseblocks on the underlying MTD device.
What: /sys/class/ubi/ubiX/bgt_enabled
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Contains ASCII "0\n" if the UBI background thread is disabled,
and ASCII "1\n" if it is enabled.
What: /sys/class/ubi/ubiX/dev
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Major and minor numbers of the character device corresponding
to this UBI device (in <major>:<minor> format).
What: /sys/class/ubi/ubiX/eraseblock_size
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Maximum logical eraseblock size this UBI device may provide. UBI
volumes may have smaller logical eraseblock size because of their
alignment.
What: /sys/class/ubi/ubiX/max_ec
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Maximum physical eraseblock erase counter value.
What: /sys/class/ubi/ubiX/max_vol_count
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Maximum number of volumes which this UBI device may have.
What: /sys/class/ubi/ubiX/min_io_size
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Minimum input/output unit size. All the I/O may only be done
in fractions of the contained number.
What: /sys/class/ubi/ubiX/mtd_num
Date: January 2008
KernelVersion: 2.6.25
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Number of the underlying MTD device.
What: /sys/class/ubi/ubiX/reserved_for_bad
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Number of physical eraseblocks reserved for bad block handling.
What: /sys/class/ubi/ubiX/ro_mode
Date: April 2016
KernelVersion: 4.7
Contact: linux-mtd@lists.infradead.org
Description:
Contains ASCII "1\n" if the read-only flag is set on this
device, and "0\n" if it is cleared. UBI devices mark themselves
as read-only when they detect an unrecoverable error.
What: /sys/class/ubi/ubiX/total_eraseblocks
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Total number of good (not marked as bad) physical eraseblocks on
the underlying MTD device.
What: /sys/class/ubi/ubiX/volumes_count
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Count of volumes on this UBI device.
What: /sys/class/ubi/ubiX/ubiX_Y/
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
The /sys/class/ubi/ubiX/ubiX_0/, /sys/class/ubi/ubiX/ubiX_1/,
etc directories describe UBI volumes on UBI device X (volumes
0, 1, etc).
What: /sys/class/ubi/ubiX/ubiX_Y/alignment
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Volume alignment - the value the logical eraseblock size of
this volume has to be aligned on. For example, 2048 means that
logical eraseblock size is multiple of 2048. In other words,
volume logical eraseblock size is UBI device logical eraseblock
size aligned to the alignment value.
What: /sys/class/ubi/ubiX/ubiX_Y/corrupted
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Contains ASCII "0\n" if the UBI volume is OK, and ASCII "1\n"
if it is corrupted (e.g., due to an interrupted volume update).
What: /sys/class/ubi/ubiX/ubiX_Y/data_bytes
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
The amount of data this volume contains. This value makes sense
only for static volumes, and for dynamic volume it equivalent
to the total volume size in bytes.
What: /sys/class/ubi/ubiX/ubiX_Y/dev
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Major and minor numbers of the character device corresponding
to this UBI volume (in <major>:<minor> format).
What: /sys/class/ubi/ubiX/ubiX_Y/name
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Volume name.
What: /sys/class/ubi/ubiX/ubiX_Y/reserved_ebs
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Count of physical eraseblock reserved for this volume.
Equivalent to the volume size in logical eraseblocks.
What: /sys/class/ubi/ubiX/ubiX_Y/type
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Volume type. Contains ASCII "dynamic\n" for dynamic volumes and
"static\n" for static volumes.
What: /sys/class/ubi/ubiX/ubiX_Y/upd_marker
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Contains ASCII "0\n" if the update marker is not set for this
volume, and "1\n" if it is set. The update marker is set when
volume update starts, and cleaned when it ends. So the presence
of the update marker indicates that the volume is being updated
at the moment of the update was interrupted. The later may be
checked using the "corrupted" sysfs file.
What: /sys/class/ubi/ubiX/ubiX_Y/usable_eb_size
Date: July 2006
KernelVersion: 2.6.22
Contact: Artem Bityutskiy <dedekind@infradead.org>
Description:
Logical eraseblock size of this volume. Equivalent to logical
eraseblock size of the device aligned on the volume alignment
value.
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