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