| 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. |