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Diffstat (limited to 'Documentation/ABI/testing/sysfs-class-mtd')
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diff --git a/Documentation/ABI/testing/sysfs-class-mtd b/Documentation/ABI/testing/sysfs-class-mtd new file mode 100644 index 000000000000..4d55a1888981 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-mtd | |||
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| 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 belongs to the MTD subsystem | ||
| 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,...} directories correspond | ||
| 15 | to each /dev/mtdX character device. These may represent | ||
| 16 | physical/simulated flash devices, partitions on a flash | ||
| 17 | device, or concatenated flash devices. They exist regardless | ||
| 18 | of whether CONFIG_MTD_CHAR is actually enabled. | ||
| 19 | |||
| 20 | What: /sys/class/mtd/mtdXro/ | ||
| 21 | Date: April 2009 | ||
| 22 | KernelVersion: 2.6.29 | ||
| 23 | Contact: linux-mtd@lists.infradead.org | ||
| 24 | Description: | ||
| 25 | These directories provide the corresponding read-only device | ||
| 26 | nodes for /sys/class/mtd/mtdX/ . They are only created | ||
| 27 | (for the benefit of udev) if CONFIG_MTD_CHAR is enabled. | ||
| 28 | |||
| 29 | What: /sys/class/mtd/mtdX/dev | ||
| 30 | Date: April 2009 | ||
| 31 | KernelVersion: 2.6.29 | ||
| 32 | Contact: linux-mtd@lists.infradead.org | ||
| 33 | Description: | ||
| 34 | Major and minor numbers of the character device corresponding | ||
| 35 | to this MTD device (in <major>:<minor> format). This is the | ||
| 36 | read-write device so <minor> will be even. | ||
| 37 | |||
| 38 | What: /sys/class/mtd/mtdXro/dev | ||
| 39 | Date: April 2009 | ||
| 40 | KernelVersion: 2.6.29 | ||
| 41 | Contact: linux-mtd@lists.infradead.org | ||
| 42 | Description: | ||
| 43 | Major and minor numbers of the character device corresponding | ||
| 44 | to the read-only variant of thie MTD device (in | ||
| 45 | <major>:<minor> format). In this case <minor> will be odd. | ||
| 46 | |||
| 47 | What: /sys/class/mtd/mtdX/erasesize | ||
| 48 | Date: April 2009 | ||
| 49 | KernelVersion: 2.6.29 | ||
| 50 | Contact: linux-mtd@lists.infradead.org | ||
| 51 | Description: | ||
| 52 | "Major" erase size for the device. If numeraseregions is | ||
| 53 | zero, this is the eraseblock size for the entire device. | ||
| 54 | Otherwise, the MEMGETREGIONCOUNT/MEMGETREGIONINFO ioctls | ||
| 55 | can be used to determine the actual eraseblock layout. | ||
| 56 | |||
| 57 | What: /sys/class/mtd/mtdX/flags | ||
| 58 | Date: April 2009 | ||
| 59 | KernelVersion: 2.6.29 | ||
| 60 | Contact: linux-mtd@lists.infradead.org | ||
| 61 | Description: | ||
| 62 | A hexadecimal value representing the device flags, ORed | ||
| 63 | together: | ||
| 64 | |||
| 65 | 0x0400: MTD_WRITEABLE - device is writable | ||
| 66 | 0x0800: MTD_BIT_WRITEABLE - single bits can be flipped | ||
| 67 | 0x1000: MTD_NO_ERASE - no erase necessary | ||
| 68 | 0x2000: MTD_POWERUP_LOCK - always locked after reset | ||
| 69 | |||
| 70 | What: /sys/class/mtd/mtdX/name | ||
| 71 | Date: April 2009 | ||
| 72 | KernelVersion: 2.6.29 | ||
| 73 | Contact: linux-mtd@lists.infradead.org | ||
| 74 | Description: | ||
| 75 | A human-readable ASCII name for the device or partition. | ||
| 76 | This will match the name in /proc/mtd . | ||
| 77 | |||
| 78 | What: /sys/class/mtd/mtdX/numeraseregions | ||
| 79 | Date: April 2009 | ||
| 80 | KernelVersion: 2.6.29 | ||
| 81 | Contact: linux-mtd@lists.infradead.org | ||
| 82 | Description: | ||
| 83 | For devices that have variable eraseblock sizes, this | ||
| 84 | provides the total number of erase regions. Otherwise, | ||
| 85 | it will read back as zero. | ||
| 86 | |||
| 87 | What: /sys/class/mtd/mtdX/oobsize | ||
| 88 | Date: April 2009 | ||
| 89 | KernelVersion: 2.6.29 | ||
| 90 | Contact: linux-mtd@lists.infradead.org | ||
| 91 | Description: | ||
| 92 | Number of OOB bytes per page. | ||
| 93 | |||
| 94 | What: /sys/class/mtd/mtdX/size | ||
| 95 | Date: April 2009 | ||
| 96 | KernelVersion: 2.6.29 | ||
| 97 | Contact: linux-mtd@lists.infradead.org | ||
| 98 | Description: | ||
| 99 | Total size of the device/partition, in bytes. | ||
| 100 | |||
| 101 | What: /sys/class/mtd/mtdX/type | ||
| 102 | Date: April 2009 | ||
| 103 | KernelVersion: 2.6.29 | ||
| 104 | Contact: linux-mtd@lists.infradead.org | ||
| 105 | Description: | ||
| 106 | One of the following ASCII strings, representing the device | ||
| 107 | type: | ||
| 108 | |||
| 109 | absent, ram, rom, nor, nand, dataflash, ubi, unknown | ||
| 110 | |||
| 111 | What: /sys/class/mtd/mtdX/writesize | ||
| 112 | Date: April 2009 | ||
| 113 | KernelVersion: 2.6.29 | ||
| 114 | Contact: linux-mtd@lists.infradead.org | ||
| 115 | Description: | ||
| 116 | Minimal writable flash unit size. This will always be | ||
| 117 | a positive integer. | ||
| 118 | |||
| 119 | In the case of NOR flash it is 1 (even though individual | ||
| 120 | bits can be cleared). | ||
| 121 | |||
| 122 | In the case of NAND flash it is one NAND page (or a | ||
| 123 | half page, or a quarter page). | ||
| 124 | |||
| 125 | In the case of ECC NOR, it is the ECC block size. | ||