1What: /sys/class/ubi/ 2Date: July 2006 3KernelVersion: 2.6.22 4Contact: Artem Bityutskiy <dedekind@infradead.org> 5Description: 6 The ubi/ class sub-directory belongs to the UBI subsystem and 7 provides general UBI information, per-UBI device information 8 and per-UBI volume information. 9 10What: /sys/class/ubi/version 11Date: July 2006 12KernelVersion: 2.6.22 13Contact: Artem Bityutskiy <dedekind@infradead.org> 14Description: 15 This file contains version of the latest supported UBI on-media 16 format. Currently it is 1, and there is no plan to change this. 17 However, if in the future UBI needs on-flash format changes 18 which cannot be done in a compatible manner, a new format 19 version will be added. So this is a mechanism for possible 20 future backward-compatible (but forward-incompatible) 21 improvements. 22 23What: /sys/class/ubiX/ 24Date: July 2006 25KernelVersion: 2.6.22 26Contact: Artem Bityutskiy <dedekind@infradead.org> 27Description: 28 The /sys/class/ubi0, /sys/class/ubi1, etc directories describe 29 UBI devices (UBI device 0, 1, etc). They contain general UBI 30 device information and per UBI volume information (each UBI 31 device may have many UBI volumes) 32 33What: /sys/class/ubi/ubiX/avail_eraseblocks 34Date: July 2006 35KernelVersion: 2.6.22 36Contact: Artem Bityutskiy <dedekind@infradead.org> 37Description: 38 Amount of available logical eraseblock. For example, one may 39 create a new UBI volume which has this amount of logical 40 eraseblocks. 41 42What: /sys/class/ubi/ubiX/bad_peb_count 43Date: July 2006 44KernelVersion: 2.6.22 45Contact: Artem Bityutskiy <dedekind@infradead.org> 46Description: 47 Count of bad physical eraseblocks on the underlying MTD device. 48 49What: /sys/class/ubi/ubiX/bgt_enabled 50Date: July 2006 51KernelVersion: 2.6.22 52Contact: Artem Bityutskiy <dedekind@infradead.org> 53Description: 54 Contains ASCII "0\n" if the UBI background thread is disabled, 55 and ASCII "1\n" if it is enabled. 56 57What: /sys/class/ubi/ubiX/dev 58Date: July 2006 59KernelVersion: 2.6.22 60Contact: Artem Bityutskiy <dedekind@infradead.org> 61Description: 62 Major and minor numbers of the character device corresponding 63 to this UBI device (in <major>:<minor> format). 64 65What: /sys/class/ubi/ubiX/eraseblock_size 66Date: July 2006 67KernelVersion: 2.6.22 68Contact: Artem Bityutskiy <dedekind@infradead.org> 69Description: 70 Maximum logical eraseblock size this UBI device may provide. UBI 71 volumes may have smaller logical eraseblock size because of their 72 alignment. 73 74What: /sys/class/ubi/ubiX/max_ec 75Date: July 2006 76KernelVersion: 2.6.22 77Contact: Artem Bityutskiy <dedekind@infradead.org> 78Description: 79 Maximum physical eraseblock erase counter value. 80 81What: /sys/class/ubi/ubiX/max_vol_count 82Date: July 2006 83KernelVersion: 2.6.22 84Contact: Artem Bityutskiy <dedekind@infradead.org> 85Description: 86 Maximum number of volumes which this UBI device may have. 87 88What: /sys/class/ubi/ubiX/min_io_size 89Date: July 2006 90KernelVersion: 2.6.22 91Contact: Artem Bityutskiy <dedekind@infradead.org> 92Description: 93 Minimum input/output unit size. All the I/O may only be done 94 in fractions of the contained number. 95 96What: /sys/class/ubi/ubiX/mtd_num 97Date: January 2008 98KernelVersion: 2.6.25 99Contact: Artem Bityutskiy <dedekind@infradead.org> 100Description: 101 Number of the underlying MTD device. 102 103What: /sys/class/ubi/ubiX/reserved_for_bad 104Date: July 2006 105KernelVersion: 2.6.22 106Contact: Artem Bityutskiy <dedekind@infradead.org> 107Description: 108 Number of physical eraseblocks reserved for bad block handling. 109 110What: /sys/class/ubi/ubiX/total_eraseblocks 111Date: July 2006 112KernelVersion: 2.6.22 113Contact: Artem Bityutskiy <dedekind@infradead.org> 114Description: 115 Total number of good (not marked as bad) physical eraseblocks on 116 the underlying MTD device. 117 118What: /sys/class/ubi/ubiX/volumes_count 119Date: July 2006 120KernelVersion: 2.6.22 121Contact: Artem Bityutskiy <dedekind@infradead.org> 122Description: 123 Count of volumes on this UBI device. 124 125What: /sys/class/ubi/ubiX/ubiX_Y/ 126Date: July 2006 127KernelVersion: 2.6.22 128Contact: Artem Bityutskiy <dedekind@infradead.org> 129Description: 130 The /sys/class/ubi/ubiX/ubiX_0/, /sys/class/ubi/ubiX/ubiX_1/, 131 etc directories describe UBI volumes on UBI device X (volumes 132 0, 1, etc). 133 134What: /sys/class/ubi/ubiX/ubiX_Y/alignment 135Date: July 2006 136KernelVersion: 2.6.22 137Contact: Artem Bityutskiy <dedekind@infradead.org> 138Description: 139 Volume alignment - the value the logical eraseblock size of 140 this volume has to be aligned on. For example, 2048 means that 141 logical eraseblock size is multiple of 2048. In other words, 142 volume logical eraseblock size is UBI device logical eraseblock 143 size aligned to the alignment value. 144 145What: /sys/class/ubi/ubiX/ubiX_Y/corrupted 146Date: July 2006 147KernelVersion: 2.6.22 148Contact: Artem Bityutskiy <dedekind@infradead.org> 149Description: 150 Contains ASCII "0\n" if the UBI volume is OK, and ASCII "1\n" 151 if it is corrupted (e.g., due to an interrupted volume update). 152 153What: /sys/class/ubi/ubiX/ubiX_Y/data_bytes 154Date: July 2006 155KernelVersion: 2.6.22 156Contact: Artem Bityutskiy <dedekind@infradead.org> 157Description: 158 The amount of data this volume contains. This value makes sense 159 only for static volumes, and for dynamic volume it equivalent 160 to the total volume size in bytes. 161 162What: /sys/class/ubi/ubiX/ubiX_Y/dev 163Date: July 2006 164KernelVersion: 2.6.22 165Contact: Artem Bityutskiy <dedekind@infradead.org> 166Description: 167 Major and minor numbers of the character device corresponding 168 to this UBI volume (in <major>:<minor> format). 169 170What: /sys/class/ubi/ubiX/ubiX_Y/name 171Date: July 2006 172KernelVersion: 2.6.22 173Contact: Artem Bityutskiy <dedekind@infradead.org> 174Description: 175 Volume name. 176 177What: /sys/class/ubi/ubiX/ubiX_Y/reserved_ebs 178Date: July 2006 179KernelVersion: 2.6.22 180Contact: Artem Bityutskiy <dedekind@infradead.org> 181Description: 182 Count of physical eraseblock reserved for this volume. 183 Equivalent to the volume size in logical eraseblocks. 184 185What: /sys/class/ubi/ubiX/ubiX_Y/type 186Date: July 2006 187KernelVersion: 2.6.22 188Contact: Artem Bityutskiy <dedekind@infradead.org> 189Description: 190 Volume type. Contains ASCII "dynamic\n" for dynamic volumes and 191 "static\n" for static volumes. 192 193What: /sys/class/ubi/ubiX/ubiX_Y/upd_marker 194Date: July 2006 195KernelVersion: 2.6.22 196Contact: Artem Bityutskiy <dedekind@infradead.org> 197Description: 198 Contains ASCII "0\n" if the update marker is not set for this 199 volume, and "1\n" if it is set. The update marker is set when 200 volume update starts, and cleaned when it ends. So the presence 201 of the update marker indicates that the volume is being updated 202 at the moment of the update was interrupted. The later may be 203 checked using the "corrupted" sysfs file. 204 205What: /sys/class/ubi/ubiX/ubiX_Y/usable_eb_size 206Date: July 2006 207KernelVersion: 2.6.22 208Contact: Artem Bityutskiy <dedekind@infradead.org> 209Description: 210 Logical eraseblock size of this volume. Equivalent to logical 211 eraseblock size of the device aligned on the volume alignment 212 value. 213