1 What: /sys/class/ubi/ 2 Date: July 2006 3 KernelVersion: 2.6.22 4 Contact: Artem Bityutskiy <dedekind@infradead.org> 5 Description: 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 10 What: /sys/class/ubi/version 11 Date: July 2006 12 KernelVersion: 2.6.22 13 Contact: Artem Bityutskiy <dedekind@infradead.org> 14 Description: 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 23 What: /sys/class/ubiX/ 24 Date: July 2006 25 KernelVersion: 2.6.22 26 Contact: Artem Bityutskiy <dedekind@infradead.org> 27 Description: 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 33 What: /sys/class/ubi/ubiX/avail_eraseblocks 34 Date: July 2006 35 KernelVersion: 2.6.22 36 Contact: Artem Bityutskiy <dedekind@infradead.org> 37 Description: 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 42 What: /sys/class/ubi/ubiX/bad_peb_count 43 Date: July 2006 44 KernelVersion: 2.6.22 45 Contact: Artem Bityutskiy <dedekind@infradead.org> 46 Description: 47 Count of bad physical eraseblocks on the underlying MTD device. 48 49 What: /sys/class/ubi/ubiX/bgt_enabled 50 Date: July 2006 51 KernelVersion: 2.6.22 52 Contact: Artem Bityutskiy <dedekind@infradead.org> 53 Description: 54 Contains ASCII "0\n" if the UBI background thread is disabled, 55 and ASCII "1\n" if it is enabled. 56 57 What: /sys/class/ubi/ubiX/dev 58 Date: July 2006 59 KernelVersion: 2.6.22 60 Contact: Artem Bityutskiy <dedekind@infradead.org> 61 Description: 62 Major and minor numbers of the character device corresponding 63 to this UBI device (in <major>:<minor> format). 64 65 What: /sys/class/ubi/ubiX/eraseblock_size 66 Date: July 2006 67 KernelVersion: 2.6.22 68 Contact: Artem Bityutskiy <dedekind@infradead.org> 69 Description: 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 74 What: /sys/class/ubi/ubiX/max_ec 75 Date: July 2006 76 KernelVersion: 2.6.22 77 Contact: Artem Bityutskiy <dedekind@infradead.org> 78 Description: 79 Maximum physical eraseblock erase counter value. 80 81 What: /sys/class/ubi/ubiX/max_vol_count 82 Date: July 2006 83 KernelVersion: 2.6.22 84 Contact: Artem Bityutskiy <dedekind@infradead.org> 85 Description: 86 Maximum number of volumes which this UBI device may have. 87 88 What: /sys/class/ubi/ubiX/min_io_size 89 Date: July 2006 90 KernelVersion: 2.6.22 91 Contact: Artem Bityutskiy <dedekind@infradead.org> 92 Description: 93 Minimum input/output unit size. All the I/O may only be done 94 in fractions of the contained number. 95 96 What: /sys/class/ubi/ubiX/mtd_num 97 Date: January 2008 98 KernelVersion: 2.6.25 99 Contact: Artem Bityutskiy <dedekind@infradead.org> 100 Description: 101 Number of the underlying MTD device. 102 103 What: /sys/class/ubi/ubiX/reserved_for_bad 104 Date: July 2006 105 KernelVersion: 2.6.22 106 Contact: Artem Bityutskiy <dedekind@infradead.org> 107 Description: 108 Number of physical eraseblocks reserved for bad block handling. 109 110 What: /sys/class/ubi/ubiX/ro_mode 111 Date: April 2016 112 KernelVersion: 4.7 113 Contact: linux-mtd@lists.infradead.org 114 Description: 115 Contains ASCII "1\n" if the read-only flag is set on this 116 device, and "0\n" if it is cleared. UBI devices mark themselves 117 as read-only when they detect an unrecoverable error. 118 119 What: /sys/class/ubi/ubiX/total_eraseblocks 120 Date: July 2006 121 KernelVersion: 2.6.22 122 Contact: Artem Bityutskiy <dedekind@infradead.org> 123 Description: 124 Total number of good (not marked as bad) physical eraseblocks on 125 the underlying MTD device. 126 127 What: /sys/class/ubi/ubiX/volumes_count 128 Date: July 2006 129 KernelVersion: 2.6.22 130 Contact: Artem Bityutskiy <dedekind@infradead.org> 131 Description: 132 Count of volumes on this UBI device. 133 134 What: /sys/class/ubi/ubiX/ubiX_Y/ 135 Date: July 2006 136 KernelVersion: 2.6.22 137 Contact: Artem Bityutskiy <dedekind@infradead.org> 138 Description: 139 The /sys/class/ubi/ubiX/ubiX_0/, /sys/class/ubi/ubiX/ubiX_1/, 140 etc directories describe UBI volumes on UBI device X (volumes 141 0, 1, etc). 142 143 What: /sys/class/ubi/ubiX/ubiX_Y/alignment 144 Date: July 2006 145 KernelVersion: 2.6.22 146 Contact: Artem Bityutskiy <dedekind@infradead.org> 147 Description: 148 Volume alignment - the value the logical eraseblock size of 149 this volume has to be aligned on. For example, 2048 means that 150 logical eraseblock size is multiple of 2048. In other words, 151 volume logical eraseblock size is UBI device logical eraseblock 152 size aligned to the alignment value. 153 154 What: /sys/class/ubi/ubiX/ubiX_Y/corrupted 155 Date: July 2006 156 KernelVersion: 2.6.22 157 Contact: Artem Bityutskiy <dedekind@infradead.org> 158 Description: 159 Contains ASCII "0\n" if the UBI volume is OK, and ASCII "1\n" 160 if it is corrupted (e.g., due to an interrupted volume update). 161 162 What: /sys/class/ubi/ubiX/ubiX_Y/data_bytes 163 Date: July 2006 164 KernelVersion: 2.6.22 165 Contact: Artem Bityutskiy <dedekind@infradead.org> 166 Description: 167 The amount of data this volume contains. This value makes sense 168 only for static volumes, and for dynamic volume it equivalent 169 to the total volume size in bytes. 170 171 What: /sys/class/ubi/ubiX/ubiX_Y/dev 172 Date: July 2006 173 KernelVersion: 2.6.22 174 Contact: Artem Bityutskiy <dedekind@infradead.org> 175 Description: 176 Major and minor numbers of the character device corresponding 177 to this UBI volume (in <major>:<minor> format). 178 179 What: /sys/class/ubi/ubiX/ubiX_Y/name 180 Date: July 2006 181 KernelVersion: 2.6.22 182 Contact: Artem Bityutskiy <dedekind@infradead.org> 183 Description: 184 Volume name. 185 186 What: /sys/class/ubi/ubiX/ubiX_Y/reserved_ebs 187 Date: July 2006 188 KernelVersion: 2.6.22 189 Contact: Artem Bityutskiy <dedekind@infradead.org> 190 Description: 191 Count of physical eraseblock reserved for this volume. 192 Equivalent to the volume size in logical eraseblocks. 193 194 What: /sys/class/ubi/ubiX/ubiX_Y/type 195 Date: July 2006 196 KernelVersion: 2.6.22 197 Contact: Artem Bityutskiy <dedekind@infradead.org> 198 Description: 199 Volume type. Contains ASCII "dynamic\n" for dynamic volumes and 200 "static\n" for static volumes. 201 202 What: /sys/class/ubi/ubiX/ubiX_Y/upd_marker 203 Date: July 2006 204 KernelVersion: 2.6.22 205 Contact: Artem Bityutskiy <dedekind@infradead.org> 206 Description: 207 Contains ASCII "0\n" if the update marker is not set for this 208 volume, and "1\n" if it is set. The update marker is set when 209 volume update starts, and cleaned when it ends. So the presence 210 of the update marker indicates that the volume is being updated 211 at the moment of the update was interrupted. The later may be 212 checked using the "corrupted" sysfs file. 213 214 What: /sys/class/ubi/ubiX/ubiX_Y/usable_eb_size 215 Date: July 2006 216 KernelVersion: 2.6.22 217 Contact: Artem Bityutskiy <dedekind@infradead.org> 218 Description: 219 Logical eraseblock size of this volume. Equivalent to logical 220 eraseblock size of the device aligned on the volume alignment 221 value.
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