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Based on kernel version 3.9. Page generated on 2013-05-02 22:52 EST.

	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/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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