2 tristate "Memory Technology Device (MTD) support"
5 Memory Technology Devices are flash, RAM and similar chips, often
6 used for solid state file systems on embedded devices. This option
7 will provide the generic support for MTD drivers to register
8 themselves with the kernel and for potential users of MTD devices
9 to enumerate the devices which are present and obtain a handle on
10 them. It will also allow you to select individual drivers for
11 particular hardware and users of MTD devices. If unsure, say N.
18 This turns on low-level debugging for the entire MTD sub-system.
19 Normally, you should say 'N'.
21 config MTD_DEBUG_VERBOSE
22 int "Debugging verbosity (0 = quiet, 3 = noisy)"
26 Determines the verbosity level of the MTD debugging messages.
29 tristate "MTD tests support"
32 This option includes various MTD tests into compilation. The tests
33 should normally be compiled as kernel modules. The modules perform
34 various checks and verifications when loaded.
36 config MTD_REDBOOT_PARTS
37 tristate "RedBoot partition table parsing"
39 RedBoot is a ROM monitor and bootloader which deals with multiple
40 'images' in flash devices by putting a table one of the erase
41 blocks on the device, similar to a partition table, which gives
42 the offsets, lengths and names of all the images stored in the
45 If you need code which can detect and parse this table, and register
46 MTD 'partitions' corresponding to each image in the table, enable
49 You will still need the parsing functions to be called by the driver
50 for your particular device. It won't happen automatically. The
51 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
56 config MTD_REDBOOT_DIRECTORY_BLOCK
57 int "Location of RedBoot partition table"
60 This option is the Linux counterpart to the
61 CYGNUM_REDBOOT_FIS_DIRECTORY_BLOCK RedBoot compile time
64 The option specifies which Flash sectors holds the RedBoot
65 partition table. A zero or positive value gives an absolute
66 erase block number. A negative value specifies a number of
67 sectors before the end of the device.
69 For example "2" means block number 2, "-1" means the last
70 block and "-2" means the penultimate block.
72 config MTD_REDBOOT_PARTS_UNALLOCATED
73 bool "Include unallocated flash regions"
75 If you need to register each unallocated flash region as a MTD
76 'partition', enable this option.
78 config MTD_REDBOOT_PARTS_READONLY
79 bool "Force read-only for RedBoot system images"
81 If you need to force read-only for 'RedBoot', 'RedBoot Config' and
82 'FIS directory' images, enable this option.
84 endif # MTD_REDBOOT_PARTS
86 config MTD_CMDLINE_PARTS
87 bool "Command line partition table parsing"
90 Allow generic configuration of the MTD partition tables via the kernel
91 command line. Multiple flash resources are supported for hardware where
92 different kinds of flash memory are available.
94 You will still need the parsing functions to be called by the driver
95 for your particular device. It won't happen automatically. The
96 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
99 The format for the command line is as follows:
101 mtdparts=<mtddef>[;<mtddef]
102 <mtddef> := <mtd-id>:<partdef>[,<partdef>]
103 <partdef> := <size>[@offset][<name>][ro]
104 <mtd-id> := unique id used in mapping driver/device
105 <size> := standard linux memsize OR "-" to denote all
109 Due to the way Linux handles the command line, no spaces are
110 allowed in the partition definition, including mtd id's and partition
115 1 flash resource (mtd-id "sa1100"), with 1 single writable partition:
118 Same flash, but 2 named partitions, the first one being read-only:
119 mtdparts=sa1100:256k(ARMboot)ro,-(root)
124 tristate "ARM Firmware Suite partition parsing"
127 The ARM Firmware Suite allows the user to divide flash devices into
128 multiple 'images'. Each such image has a header containing its name
131 If you need code which can detect and parse these tables, and
132 register MTD 'partitions' corresponding to each image detected,
135 You will still need the parsing functions to be called by the driver
136 for your particular device. It won't happen automatically. The
137 'physmap' map driver (CONFIG_MTD_PHYSMAP) does this, for example.
143 This provides a partition parsing function which derives
144 the partition map from the children of the flash node,
145 as described in Documentation/devicetree/booting-without-of.txt.
148 tristate "TI AR7 partitioning support"
150 TI AR7 partitioning support
152 comment "User Modules And Translation Layers"
155 tristate "Direct char device access to MTD devices"
157 This provides a character device for each MTD device present in
158 the system, allowing the user to read and write directly to the
159 memory chips, and also use ioctl() to obtain information about
160 the device, or to erase parts of it.
165 Enable access to OTP regions using MTD_CHAR.
168 tristate "Common interface to block layer for MTD 'translation layers'"
173 tristate "Caching block device access to MTD devices"
177 Although most flash chips have an erase size too large to be useful
178 as block devices, it is possible to use MTD devices which are based
179 on RAM chips in this manner. This block device is a user of MTD
180 devices performing that function.
182 At the moment, it is also required for the Journalling Flash File
183 System(s) to obtain a handle on the MTD device when it's mounted
184 (although JFFS and JFFS2 don't actually use any of the functionality
185 of the mtdblock device).
187 Later, it may be extended to perform read/erase/modify/write cycles
188 on flash chips to emulate a smaller block size. Needless to say,
189 this is very unsafe, but could be useful for file systems which are
190 almost never written to.
192 You do not need this option for use with the DiskOnChip devices. For
193 those, enable NFTL support (CONFIG_NFTL) instead.
196 tristate "Readonly block device access to MTD devices"
197 depends on MTD_BLOCK!=y && BLOCK
200 This allows you to mount read-only file systems (such as cramfs)
201 from an MTD device, without the overhead (and danger) of the caching
204 You do not need this option for use with the DiskOnChip devices. For
205 those, enable NFTL support (CONFIG_NFTL) instead.
208 tristate "FTL (Flash Translation Layer) support"
212 This provides support for the original Flash Translation Layer which
213 is part of the PCMCIA specification. It uses a kind of pseudo-
214 file system on a flash device to emulate a block device with
215 512-byte sectors, on top of which you put a 'normal' file system.
217 You may find that the algorithms used in this code are patented
218 unless you live in the Free World where software patents aren't
219 legal - in the USA you are only permitted to use this on PCMCIA
220 hardware, although under the terms of the GPL you're obviously
221 permitted to copy, modify and distribute the code as you wish. Just
225 tristate "NFTL (NAND Flash Translation Layer) support"
229 This provides support for the NAND Flash Translation Layer which is
230 used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
231 file system on a flash device to emulate a block device with
232 512-byte sectors, on top of which you put a 'normal' file system.
234 You may find that the algorithms used in this code are patented
235 unless you live in the Free World where software patents aren't
236 legal - in the USA you are only permitted to use this on DiskOnChip
237 hardware, although under the terms of the GPL you're obviously
238 permitted to copy, modify and distribute the code as you wish. Just
242 bool "Write support for NFTL"
245 Support for writing to the NAND Flash Translation Layer, as used
249 tristate "INFTL (Inverse NAND Flash Translation Layer) support"
253 This provides support for the Inverse NAND Flash Translation
254 Layer which is used on M-Systems' newer DiskOnChip devices. It
255 uses a kind of pseudo-file system on a flash device to emulate
256 a block device with 512-byte sectors, on top of which you put
257 a 'normal' file system.
259 You may find that the algorithms used in this code are patented
260 unless you live in the Free World where software patents aren't
261 legal - in the USA you are only permitted to use this on DiskOnChip
262 hardware, although under the terms of the GPL you're obviously
263 permitted to copy, modify and distribute the code as you wish. Just
267 tristate "Resident Flash Disk (Flash Translation Layer) support"
271 This provides support for the flash translation layer known
272 as the Resident Flash Disk (RFD), as used by the Embedded BIOS
273 of General Software. There is a blurb at:
275 http://www.gensw.com/pages/prod/bios/rfd.htm
278 tristate "NAND SSFDC (SmartMedia) read only translation layer"
282 This enables read only access to SmartMedia formatted NAND
283 flash. You can mount it with FAT file system.
287 tristate "SmartMedia/xD new translation layer"
288 depends on EXPERIMENTAL && BLOCK
292 This enables EXPERIMENTAL R/W support for SmartMedia/xD
293 FTL (Flash translation layer).
294 Write support is only lightly tested, therefore this driver
295 isn't recommended to use with valuable data (anyway if you have
296 valuable data, do backups regardless of software/hardware you
297 use, because you never know what will eat your data...)
298 If you only need R/O access, you can use older R/O driver
302 tristate "Log panic/oops to an MTD buffer"
304 This enables panic and oops messages to be logged to a circular
305 buffer in a flash partition where it can be read back at some
308 To use, add console=ttyMTDx to the kernel command line,
309 where x is the MTD device number to use.
312 tristate "Swap on MTD device support"
313 depends on MTD && SWAP
316 Provides volatile block device driver on top of mtd partition
317 suitable for swapping. The mapping of written blocks is not saved.
318 The driver provides wear leveling by storing erase counter into the
321 source "drivers/mtd/chips/Kconfig"
323 source "drivers/mtd/maps/Kconfig"
325 source "drivers/mtd/devices/Kconfig"
327 source "drivers/mtd/nand/Kconfig"
329 source "drivers/mtd/onenand/Kconfig"
331 source "drivers/mtd/lpddr/Kconfig"
333 source "drivers/mtd/ubi/Kconfig"