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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.
generated by cgit v1.2.2 (git 2.25.0) at 2025-12-28 23:19:39 -0500