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126 lines
3.7 KiB
Text
126 lines
3.7 KiB
Text
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What: /sys/class/mtd/
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Date: April 2009
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KernelVersion: 2.6.29
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Contact: linux-mtd@lists.infradead.org
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Description:
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The mtd/ class subdirectory belongs to the MTD subsystem
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(MTD core).
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What: /sys/class/mtd/mtdX/
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Date: April 2009
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KernelVersion: 2.6.29
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Contact: linux-mtd@lists.infradead.org
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Description:
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The /sys/class/mtd/mtd{0,1,2,3,...} directories correspond
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to each /dev/mtdX character device. These may represent
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physical/simulated flash devices, partitions on a flash
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device, or concatenated flash devices. They exist regardless
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of whether CONFIG_MTD_CHAR is actually enabled.
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What: /sys/class/mtd/mtdXro/
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Date: April 2009
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KernelVersion: 2.6.29
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Contact: linux-mtd@lists.infradead.org
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Description:
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These directories provide the corresponding read-only device
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nodes for /sys/class/mtd/mtdX/ . They are only created
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(for the benefit of udev) if CONFIG_MTD_CHAR is enabled.
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What: /sys/class/mtd/mtdX/dev
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Date: April 2009
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KernelVersion: 2.6.29
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Contact: linux-mtd@lists.infradead.org
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Description:
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Major and minor numbers of the character device corresponding
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to this MTD device (in <major>:<minor> format). This is the
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read-write device so <minor> will be even.
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What: /sys/class/mtd/mtdXro/dev
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Date: April 2009
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KernelVersion: 2.6.29
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Contact: linux-mtd@lists.infradead.org
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Description:
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Major and minor numbers of the character device corresponding
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to the read-only variant of thie MTD device (in
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<major>:<minor> format). In this case <minor> will be odd.
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What: /sys/class/mtd/mtdX/erasesize
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Date: April 2009
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KernelVersion: 2.6.29
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Contact: linux-mtd@lists.infradead.org
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Description:
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"Major" erase size for the device. If numeraseregions is
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zero, this is the eraseblock size for the entire device.
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Otherwise, the MEMGETREGIONCOUNT/MEMGETREGIONINFO ioctls
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can be used to determine the actual eraseblock layout.
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What: /sys/class/mtd/mtdX/flags
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Date: April 2009
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KernelVersion: 2.6.29
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Contact: linux-mtd@lists.infradead.org
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Description:
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A hexadecimal value representing the device flags, ORed
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together:
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0x0400: MTD_WRITEABLE - device is writable
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0x0800: MTD_BIT_WRITEABLE - single bits can be flipped
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0x1000: MTD_NO_ERASE - no erase necessary
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0x2000: MTD_POWERUP_LOCK - always locked after reset
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What: /sys/class/mtd/mtdX/name
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Date: April 2009
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KernelVersion: 2.6.29
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Contact: linux-mtd@lists.infradead.org
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Description:
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A human-readable ASCII name for the device or partition.
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This will match the name in /proc/mtd .
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What: /sys/class/mtd/mtdX/numeraseregions
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Date: April 2009
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KernelVersion: 2.6.29
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Contact: linux-mtd@lists.infradead.org
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Description:
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For devices that have variable eraseblock sizes, this
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provides the total number of erase regions. Otherwise,
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it will read back as zero.
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What: /sys/class/mtd/mtdX/oobsize
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Date: April 2009
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KernelVersion: 2.6.29
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Contact: linux-mtd@lists.infradead.org
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Description:
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Number of OOB bytes per page.
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What: /sys/class/mtd/mtdX/size
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Date: April 2009
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KernelVersion: 2.6.29
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Contact: linux-mtd@lists.infradead.org
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Description:
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Total size of the device/partition, in bytes.
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What: /sys/class/mtd/mtdX/type
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Date: April 2009
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KernelVersion: 2.6.29
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Contact: linux-mtd@lists.infradead.org
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Description:
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One of the following ASCII strings, representing the device
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type:
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absent, ram, rom, nor, nand, dataflash, ubi, unknown
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What: /sys/class/mtd/mtdX/writesize
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Date: April 2009
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KernelVersion: 2.6.29
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Contact: linux-mtd@lists.infradead.org
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Description:
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Minimal writable flash unit size. This will always be
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a positive integer.
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In the case of NOR flash it is 1 (even though individual
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bits can be cleared).
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In the case of NAND flash it is one NAND page (or a
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half page, or a quarter page).
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In the case of ECC NOR, it is the ECC block size.
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