1 What: /sys/class/mtd/
2 Date: April 2009
3 KernelVersion: 2.6.29
4 Contact: linux-mtd@lists.infradead.org
5 Description:
6 The mtd/ class subdirectory be
7 (MTD core).
8
9 What: /sys/class/mtd/mtdX/
10 Date: April 2009
11 KernelVersion: 2.6.29
12 Contact: linux-mtd@lists.infradead.org
13 Description:
14 The /sys/class/mtd/mtd{0,1,2,3
15 to each /dev/mtdX character de
16 physical/simulated flash devic
17 device, or concatenated flash
18
19 What: /sys/class/mtd/mtdXro/
20 Date: April 2009
21 KernelVersion: 2.6.29
22 Contact: linux-mtd@lists.infradead.org
23 Description:
24 These directories provide the
25 nodes for /sys/class/mtd/mtdX/
26
27 What: /sys/class/mtd/mtdX/dev
28 Date: April 2009
29 KernelVersion: 2.6.29
30 Contact: linux-mtd@lists.infradead.org
31 Description:
32 Major and minor numbers of the
33 to this MTD device (in <major>
34 read-write device so <minor> w
35
36 What: /sys/class/mtd/mtdXro/dev
37 Date: April 2009
38 KernelVersion: 2.6.29
39 Contact: linux-mtd@lists.infradead.org
40 Description:
41 Major and minor numbers of the
42 to the read-only variant of th
43 <major>:<minor> format). In t
44
45 What: /sys/class/mtd/mtdX/erasesize
46 Date: April 2009
47 KernelVersion: 2.6.29
48 Contact: linux-mtd@lists.infradead.org
49 Description:
50 "Major" erase size for the dev
51 zero, this is the eraseblock s
52 Otherwise, the MEMGETREGIONCOU
53 can be used to determine the a
54
55 What: /sys/class/mtd/mtdX/flags
56 Date: April 2009
57 KernelVersion: 2.6.29
58 Contact: linux-mtd@lists.infradead.org
59 Description:
60 A hexadecimal value representi
61 together:
62
63 0x0400: MTD_WRITEABLE - device
64 0x0800: MTD_BIT_WRITEABLE - si
65 0x1000: MTD_NO_ERASE - no eras
66 0x2000: MTD_POWERUP_LOCK - alw
67
68 What: /sys/class/mtd/mtdX/name
69 Date: April 2009
70 KernelVersion: 2.6.29
71 Contact: linux-mtd@lists.infradead.org
72 Description:
73 A human-readable ASCII name fo
74 This will match the name in /p
75
76 What: /sys/class/mtd/mtdX/numerasere
77 Date: April 2009
78 KernelVersion: 2.6.29
79 Contact: linux-mtd@lists.infradead.org
80 Description:
81 For devices that have variable
82 provides the total number of e
83 it will read back as zero.
84
85 What: /sys/class/mtd/mtdX/oobsize
86 Date: April 2009
87 KernelVersion: 2.6.29
88 Contact: linux-mtd@lists.infradead.org
89 Description:
90 Number of OOB bytes per page.
91
92 What: /sys/class/mtd/mtdX/size
93 Date: April 2009
94 KernelVersion: 2.6.29
95 Contact: linux-mtd@lists.infradead.org
96 Description:
97 Total size of the device/parti
98
99 What: /sys/class/mtd/mtdX/type
100 Date: April 2009
101 KernelVersion: 2.6.29
102 Contact: linux-mtd@lists.infradead.org
103 Description:
104 One of the following ASCII str
105 type:
106
107 absent, ram, rom, nor, nand, m
108
109 What: /sys/class/mtd/mtdX/writesize
110 Date: April 2009
111 KernelVersion: 2.6.29
112 Contact: linux-mtd@lists.infradead.org
113 Description:
114 Minimal writable flash unit si
115 a positive integer.
116
117 In the case of NOR flash it is
118 bits can be cleared).
119
120 In the case of NAND flash it i
121 half page, or a quarter page).
122
123 In the case of ECC NOR, it is
124
125 What: /sys/class/mtd/mtdX/ecc_streng
126 Date: April 2012
127 KernelVersion: 3.4
128 Contact: linux-mtd@lists.infradead.org
129 Description:
130 Maximum number of bit errors t
131 correcting within each region
132 ecc_step_size). This will alw
133
134 In the case of devices lacking
135
136 What: /sys/class/mtd/mtdX/bitflip_th
137 Date: April 2012
138 KernelVersion: 3.4
139 Contact: linux-mtd@lists.infradead.org
140 Description:
141 This allows the user to examin
142 mtd returns -EUCLEAN from mtd_
143 maximum number of bit errors t
144 region comprising an ecc step
145 or exceeds this value, -EUCLEA
146 an error, 0 is returned. High
147 return code as an indication t
148 degrading and should be scruti
149 marked as bad.
150
151 The initial value may be speci
152 If not, then the default value
153
154 The introduction of this featu
155 meaning of the -EUCLEAN return
156 interpreted to mean simply "on
157 corrected". Its new interpret
158 dangerously high number of bit
159 more regions comprising an ecc
160 "dangerously high" can be adju
161 bitflip_threshold. Users are
162 however, unless they know what
163 knowledge of the properties of
164 bitflip_threshold should be lo
165 block degradation, but high en
166 a persistent return value of -
167 bitflips occur. Note that if
168 ecc_strength, -EUCLEAN is neve
169 Conversely, if bitflip_thresho
170 returned, absent a hard error.
171
172 This is generally applicable o
173 capability. It is ignored on
174 i.e., devices for which ecc_st
175
176 What: /sys/class/mtd/mtdX/ecc_step_s
177 Date: May 2013
178 KernelVersion: 3.10
179 Contact: linux-mtd@lists.infradead.org
180 Description:
181 The size of a single region co
182 step. Devices may have severa
183 each writesize region.
184
185 It will always be a non-negati
186 devices lacking any ECC capabi
187
188 What: /sys/class/mtd/mtdX/ecc_failur
189 Date: June 2014
190 KernelVersion: 3.17
191 Contact: linux-mtd@lists.infradead.org
192 Description:
193 The number of failures reporte
194 these failures are associated
195
196 It will always be a non-negati
197 devices lacking any ECC capabi
198
199 What: /sys/class/mtd/mtdX/corrected_
200 Date: June 2014
201 KernelVersion: 3.17
202 Contact: linux-mtd@lists.infradead.org
203 Description:
204 The number of bits that have b
205 device's ECC.
206
207 It will always be a non-negati
208 devices lacking any ECC capabi
209
210 What: /sys/class/mtd/mtdX/bad_blocks
211 Date: June 2014
212 KernelVersion: 3.17
213 Contact: linux-mtd@lists.infradead.org
214 Description:
215 The number of blocks marked as
216
217 What: /sys/class/mtd/mtdX/bbt_blocks
218 Date: June 2014
219 KernelVersion: 3.17
220 Contact: linux-mtd@lists.infradead.org
221 Description:
222 The number of blocks that are
223 this partition. These are typi
224 bad block table (BBT).
225
226 What: /sys/class/mtd/mtdX/offset
227 Date: March 2015
228 KernelVersion: 4.1
229 Contact: linux-mtd@lists.infradead.org
230 Description:
231 For a partition, the offset of
232 of the parent (another partiti
233 This attribute is absent on fl
234 to distinguish them from parti
235
236 What: /sys/class/mtd/mtdX/oobavail
237 Date: April 2018
238 KernelVersion: 4.16
239 Contact: linux-mtd@lists.infradead.org
240 Description:
241 Number of bytes available for
242 the out of band area.
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