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/Documentation/ABI/testing/
Dsysfs-class-mtd1 What: /sys/class/mtd/
4 Contact: linux-mtd@lists.infradead.org
6 The mtd/ class subdirectory belongs to the MTD subsystem
7 (MTD core).
9 What: /sys/class/mtd/mtdX/
12 Contact: linux-mtd@lists.infradead.org
14 The /sys/class/mtd/mtd{0,1,2,3,...} directories correspond
19 What: /sys/class/mtd/mtdXro/
22 Contact: linux-mtd@lists.infradead.org
24 These directories provide the corresponding read-only device
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Dsysfs-bus-spi-devices-spi-nor1 What: /sys/bus/spi/devices/.../spi-nor/jedec_id
4 Contact: linux-mtd@lists.infradead.org
10 non-JEDEC compliant flashes.
12 What: /sys/bus/spi/devices/.../spi-nor/manufacturer
15 Contact: linux-mtd@lists.infradead.org
22 What: /sys/bus/spi/devices/.../spi-nor/partname
25 Contact: linux-mtd@lists.infradead.org
26 Description: (RO) Part name of the SPI NOR flash.
32 What: /sys/bus/spi/devices/.../spi-nor/sfdp
35 Contact: linux-mtd@lists.infradead.org
/Documentation/filesystems/
Dubifs.rst1 .. SPDX-License-Identifier: GPL-2.0
10 UBIFS file-system stands for UBI File System. UBI stands for "Unsorted
13 is completely different to any traditional file-system in Linux, like
14 Ext2, XFS, JFS, etc. UBIFS represents a separate class of file-systems
15 which work with MTD devices, not block devices. The other Linux
16 file-system of this class is JFFS2.
18 To make it more clear, here is a small comparison of MTD devices and
21 1 MTD devices represent flash devices and they consist of eraseblocks of
24 2 MTD devices support 3 main operations - read from some offset within an
26 eraseblock. Block devices support 2 main operations - read a whole
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Dcramfs.rst1 .. SPDX-License-Identifier: GPL-2.0
4 Cramfs - cram a filesystem onto a small ROM
10 allows random page access. The meta-data is not compressed, but is
15 compact also makes it _very_ hard to update on-the-fly), so you have to
20 -----------
36 no need to use -noleaf in ``find``, btw.)
39 (1970 GMT). Recently-accessed files may have updated timestamps, but
52 --------------------------
62 eXecute-In-Place (XIP) from ROM of read-only segments. Data segments mapped
63 read-write (hence they have to be copied to RAM) may still be compressed in
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Dubifs-authentication.rst1 .. SPDX-License-Identifier: GPL-2.0
24 binary to perform a malicious action when executed [DMC-CBC-ATTACK]. Since
28 Other full disk encryption systems like dm-crypt cover all filesystem metadata,
31 time. For dm-crypt and other filesystems that build upon the Linux block IO
32 layer, the dm-integrity or dm-verity subsystems [DM-INTEGRITY, DM-VERITY]
34 These can also be combined with dm-crypt [CRYPTSETUP2].
38 name encryption, the authentication system could be tied into fscrypt such that
43 MTD, UBI & UBIFS
44 ----------------
46 On Linux, the MTD (Memory Technology Devices) subsystem provides a uniform
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Df2fs.rst1 .. SPDX-License-Identifier: GPL-2.0
4 WHAT IS Flash-Friendly File System (F2FS)?
7 NAND flash memory-based storage devices, such as SSD, eMMC, and SD cards, have
13 F2FS is a file system exploiting NAND flash memory-based storage devices, which
14 is based on Log-structured File System (LFS). The design has been focused on
18 Since a NAND flash memory-based storage device shows different characteristic
20 F2FS and its tools support various parameters not only for configuring on-disk
26 - git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs-tools.git
30 - linux-f2fs-devel@lists.sourceforge.net
34 - https://bugzilla.kernel.org/enter_bug.cgi?product=File%20System&component=f2fs
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/Documentation/devicetree/bindings/mtd/
Dmtd-physmap.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/mtd/mtd-physmap.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: CFI or JEDEC memory-mapped NOR flash, MTD-RAM (NVRAM...)
10 - Rob Herring <robh@kernel.org>
17 - $ref: mtd.yaml#
18 - $ref: /schemas/memory-controllers/mc-peripheral-props.yaml#
23 - items:
24 - enum:
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Dmtd.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/mtd/mtd.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: MTD (Memory Technology Device)
10 - Miquel Raynal <miquel.raynal@bootlin.com>
11 - Richard Weinberger <richard@nod.at>
21 User-defined MTD device name. Can be used to assign user friendly
22 names to MTD devices (instead of the flash model or flash controller
23 based name) in order to ease flash device identification and/or
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Dflctl-nand.txt4 - compatible : "renesas,shmobile-flctl-sh7372"
5 - reg : Address range of the FLCTL
6 - interrupts : flste IRQ number
7 - nand-bus-width : bus width to NAND chip
10 - dmas: DMA specifier(s)
11 - dma-names: name for each DMA specifier. Valid names are
17 The device tree may optionally contain sub-nodes describing partitions of the
18 address space. See mtd.yaml for more detail.
23 #address-cells = <1>;
24 #size-cells = <1>;
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Dti,elm.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/mtd/ti,elm.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Roger Quadros <rogerq@kernel.org>
20 - ti,am3352-elm
21 - ti,am64-elm
33 clock-names:
35 - const: fck
37 power-domains:
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/Documentation/driver-api/mtd/
Dspi-intel.rst2 Upgrading BIOS using spi-intel
14 The spi-intel driver makes it possible to read and write the SPI serial
16 any of them set, the whole MTD device is made read-only to prevent
18 contents as read-only but it can be changed from kernel command line,
31 2) Install mtd-utils package [2]. We need this in order to erase the SPI
33 name "mtd-utils".
39 4) Once the board is up and running again, find the right MTD partition
42 # cat /proc/mtd
43 dev: size erasesize name
67 Erasing 4 Kibyte @ 7ff000 -- 100 % complete
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Dspi-nor.rst6 -----------------------------------
11 standard set of internal read-only parameter tables.
17 on its SFDP data. All one has to do is to specify the "jedec,spi-nor"
28 -----------------------------
31 section, after the ``---`` marker.
41 root@1:~# cat /sys/bus/spi/devices/spi0.0/spi-nor/partname
43 root@1:~# cat /sys/bus/spi/devices/spi0.0/spi-nor/jedec_id
45 root@1:~# cat /sys/bus/spi/devices/spi0.0/spi-nor/manufacturer
47 root@1:~# xxd -p /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
69 root@1:~# sha256sum /sys/bus/spi/devices/spi0.0/spi-nor/sfdp
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/Documentation/arch/arm/sa1100/
Dassabet.rst2 The Intel Assabet (SA-1110 evaluation) board
13 -------------------
25 -----------------------
39 John Dorsey has produced add-on patches to add support for Assabet and
55 - ftp://ftp.netwinder.org/users/n/nico/
56 - ftp://ftp.arm.linux.org.uk/pub/linux/arm/people/nico/
57 - ftp://ftp.handhelds.org/pub/linux/arm/sa-1100-patches/
59 Look for redboot-assabet*.tgz. Some installation infos are provided in
60 redboot-assabet*.txt.
64 -----------------------------
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/Documentation/devicetree/bindings/mtd/partitions/
Dubi-volume.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/mtd/partitions/ubi-volume.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 by their ID or their name, or both.
14 - Daniel Golle <daniel@makrotopia.org>
27 nvmem-layout:
28 $ref: /schemas/nvmem/layouts/nvmem-layout.yaml#
33 - required:
34 - volid
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Dpartition.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/mtd/partitions/partition.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
15 In this specific case, a specific suffix is required to the node name.
16 Everything after 'partition-' will be used as the partition name to compare
19 be used instead of the node name to make the comparison.
26 - Rafał Miłecki <rafal@milecki.pl>
34 description: The label / name for this partition. If omitted, the label
35 is taken from the node name (excluding the unit address).
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/Documentation/ABI/stable/
Dsysfs-class-ubi6 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.
15 This file contains version of the latest supported UBI on-media
17 However, if in the future UBI needs on-flash format changes
20 future backward-compatible (but forward-incompatible)
47 Count of bad physical eraseblocks on the underlying MTD device.
101 Number of the underlying MTD device.
113 Contact: linux-mtd@lists.infradead.org
115 Contains ASCII "1\n" if the read-only flag is set on this
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/Documentation/driver-api/
Dmtdnand.rst2 MTD NAND Driver Programming Interface
10 The generic NAND driver supports almost all NAND and AG-AND based chips
11 and connects them to the Memory Technology Devices (MTD) subsystem of
31 --------------------------
37 - [MTD Interface]
39 These functions provide the interface to the MTD kernel API. They are
43 - [NAND Interface]
48 - [GENERIC]
53 - [DEFAULT]
65 -------------------------------
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/Documentation/admin-guide/
Dpstore-blk.rst1 .. SPDX-License-Identifier: GPL-2.0
7 ------------
10 block device and non-block device before the system crashes. You can get
13 mount -t pstore pstore /sys/fs/pstore
17 ---------------------
27 Configurations for driver are all about block device and non-block device,
31 -----------------------
46 It's required for pstore/blk. It is also used for MTD device.
51 #. /dev/<disk_name><decimal> represents the device number of partition - device
53 #. /dev/<disk_name>p<decimal> - same as the above; this form is used when disk
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Dkernel-parameters.rst3 The kernel's command-line parameters
12 The kernel parses parameters from the kernel command line up to "``--``";
16 Everything after "``--``" is passed as an argument to init.
19 line with a module name prefix, or via modprobe, e.g.::
32 log_buf_len=1M print-fatal-signals=1
36 log-buf-len=1M print_fatal_signals=1
38 Double-quotes can be used to protect spaces in values, e.g.::
43 ----------
52 <cpu number>-<cpu number>
57 <cpu number>,...,<cpu number>-<cpu number>
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Dkernel-parameters.txt16 force -- enable ACPI if default was off
17 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
18 off -- disable ACPI if default was on
19 noirq -- do not use ACPI for IRQ routing
20 strict -- Be less tolerant of platforms that are not
22 rsdt -- prefer RSDT over (default) XSDT
23 copy_dsdt -- copy DSDT to memory
24 nospcr -- disable console in ACPI SPCR table as
41 If set to vendor, prefer vendor-specific driver
73 Documentation/firmware-guide/acpi/debug.rst for more information about
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Ddevices.txt1 0 Unnamed devices (e.g. non-device mounts)
7 2 = /dev/kmem OBSOLETE - replaced by /proc/kcore
11 6 = /dev/core OBSOLETE - replaced by /proc/kcore
18 12 = /dev/oldmem OBSOLETE - replaced by /proc/vmcore
31 2 char Pseudo-TTY masters
37 Pseudo-tty's are named as follows:
40 the 1st through 16th series of 16 pseudo-ttys each, and
44 These are the old-style (BSD) PTY devices; Unix98
99 NOTE: The letter in the device name (d, q, h or u)
106 3 char Pseudo-TTY slaves
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/Documentation/devicetree/bindings/net/wireless/
Dmediatek,mt76.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 # Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
4 ---
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 - Felix Fietkau <nbd@nbd.name>
12 - Lorenzo Bianconi <lorenzo@kernel.org>
13 - Ryder Lee <ryder.lee@mediatek.com>
25 - mediatek,mt76
26 - mediatek,mt7628-wmac
27 - mediatek,mt7622-wmac
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/Documentation/devicetree/bindings/leds/
Dcommon.yaml1 # SPDX-License-Identifier: GPL-2.0-only
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Jacek Anaszewski <jacek.anaszewski@gmail.com>
11 - Pavel Machek <pavel@ucw.cz>
25 led-sources:
30 $ref: /schemas/types.yaml#/definitions/uint32-array
35 from the header include/dt-bindings/leds/common.h. If there is no
42 the header include/dt-bindings/leds/common.h. If there is no matching
48 function-enumerator:
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/Documentation/admin-guide/media/
Dmgb4.rst1 .. SPDX-License-Identifier: GPL-2.0
7 ---------------
13 There are two types of parameters - global / PCI card related, found under
23 | 0 - No module present
24 | 1 - FPDL3
25 | 2 - GMSL
33 | 1 - FPDL3
34 | 2 - GMSL
42 PRODUCT-REVISION-SERIES-SERIAL
55 | 0 - single
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/Documentation/spi/
Dspi-summary.rst5 02-Feb-2012
8 ------------
17 clocking modes through which data is exchanged; mode-0 and mode-3 are most
32 - SPI may be used for request/response style device protocols, as with
35 - It may also be used to stream data in either direction (half duplex),
38 - Some devices may use eight bit words. Others may use different word
39 lengths, such as streams of 12-bit or 20-bit digital samples.
41 - Words are usually sent with their most significant bit (MSB) first,
44 - Sometimes SPI is used to daisy-chain devices, like shift registers.
51 SPI is only one of the names used by such four-wire protocols, and
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