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.
37 tristate "MTD concatenating support"
39 Support for concatenating several MTD devices into a single
40 (virtual) one. This allows you to have -for example- a JFFS(2)
41 file system spanning multiple physical flash chips. If unsure,
45 bool "MTD partitioning support"
47 If you have a device which needs to divide its flash chip(s) up
48 into multiple 'partitions', each of which appears to the user as
49 a separate MTD device, you require this option to be enabled. If
52 Note, however, that you don't need this option for the DiskOnChip
53 devices. Partitioning on NFTL 'devices' is a different - that's the
54 'normal' form of partitioning used on a block device.
58 config MTD_REDBOOT_PARTS
59 tristate "RedBoot partition table parsing"
61 RedBoot is a ROM monitor and bootloader which deals with multiple
62 'images' in flash devices by putting a table one of the erase
63 blocks on the device, similar to a partition table, which gives
64 the offsets, lengths and names of all the images stored in the
67 If you need code which can detect and parse this table, and register
68 MTD 'partitions' corresponding to each image in the table, enable
71 You will still need the parsing functions to be called by the driver
72 for your particular device. It won't happen automatically. The
73 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
78 config MTD_REDBOOT_DIRECTORY_BLOCK
79 int "Location of RedBoot partition table"
82 This option is the Linux counterpart to the
83 CYGNUM_REDBOOT_FIS_DIRECTORY_BLOCK RedBoot compile time
86 The option specifies which Flash sectors holds the RedBoot
87 partition table. A zero or positive value gives an absolute
88 erase block number. A negative value specifies a number of
89 sectors before the end of the device.
91 For example "2" means block number 2, "-1" means the last
92 block and "-2" means the penultimate block.
94 config MTD_REDBOOT_PARTS_UNALLOCATED
95 bool "Include unallocated flash regions"
97 If you need to register each unallocated flash region as a MTD
98 'partition', enable this option.
100 config MTD_REDBOOT_PARTS_READONLY
101 bool "Force read-only for RedBoot system images"
103 If you need to force read-only for 'RedBoot', 'RedBoot Config' and
104 'FIS directory' images, enable this option.
106 endif # MTD_REDBOOT_PARTS
108 config MTD_CMDLINE_PARTS
109 bool "Command line partition table parsing"
110 depends on MTD_PARTITIONS = "y" && MTD = "y"
112 Allow generic configuration of the MTD partition tables via the kernel
113 command line. Multiple flash resources are supported for hardware where
114 different kinds of flash memory are available.
116 You will still need the parsing functions to be called by the driver
117 for your particular device. It won't happen automatically. The
118 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
121 The format for the command line is as follows:
123 mtdparts=<mtddef>[;<mtddef]
124 <mtddef> := <mtd-id>:<partdef>[,<partdef>]
125 <partdef> := <size>[@offset][<name>][ro]
126 <mtd-id> := unique id used in mapping driver/device
127 <size> := standard linux memsize OR "-" to denote all
131 Due to the way Linux handles the command line, no spaces are
132 allowed in the partition definition, including mtd id's and partition
137 1 flash resource (mtd-id "sa1100"), with 1 single writable partition:
140 Same flash, but 2 named partitions, the first one being read-only:
141 mtdparts=sa1100:256k(ARMboot)ro,-(root)
146 tristate "ARM Firmware Suite partition parsing"
149 The ARM Firmware Suite allows the user to divide flash devices into
150 multiple 'images'. Each such image has a header containing its name
153 If you need code which can detect and parse these tables, and
154 register MTD 'partitions' corresponding to each image detected,
157 You will still need the parsing functions to be called by the driver
158 for your particular device. It won't happen automatically. The
159 'armflash' map driver (CONFIG_MTD_ARM_INTEGRATOR) does this, for
166 This provides a partition parsing function which derives
167 the partition map from the children of the flash node,
168 as described in Documentation/powerpc/booting-without-of.txt.
171 tristate "TI AR7 partitioning support"
173 TI AR7 partitioning support
175 endif # MTD_PARTITIONS
177 comment "User Modules And Translation Layers"
180 tristate "Direct char device access to MTD devices"
182 This provides a character device for each MTD device present in
183 the system, allowing the user to read and write directly to the
184 memory chips, and also use ioctl() to obtain information about
185 the device, or to erase parts of it.
190 Enable access to OTP regions using MTD_CHAR.
193 tristate "Common interface to block layer for MTD 'translation layers'"
198 tristate "Caching block device access to MTD devices"
202 Although most flash chips have an erase size too large to be useful
203 as block devices, it is possible to use MTD devices which are based
204 on RAM chips in this manner. This block device is a user of MTD
205 devices performing that function.
207 At the moment, it is also required for the Journalling Flash File
208 System(s) to obtain a handle on the MTD device when it's mounted
209 (although JFFS and JFFS2 don't actually use any of the functionality
210 of the mtdblock device).
212 Later, it may be extended to perform read/erase/modify/write cycles
213 on flash chips to emulate a smaller block size. Needless to say,
214 this is very unsafe, but could be useful for file systems which are
215 almost never written to.
217 You do not need this option for use with the DiskOnChip devices. For
218 those, enable NFTL support (CONFIG_NFTL) instead.
221 tristate "Readonly block device access to MTD devices"
222 depends on MTD_BLOCK!=y && BLOCK
225 This allows you to mount read-only file systems (such as cramfs)
226 from an MTD device, without the overhead (and danger) of the caching
229 You do not need this option for use with the DiskOnChip devices. For
230 those, enable NFTL support (CONFIG_NFTL) instead.
233 tristate "FTL (Flash Translation Layer) support"
237 This provides support for the original Flash Translation Layer which
238 is part of the PCMCIA specification. It uses a kind of pseudo-
239 file system on a flash device to emulate a block device with
240 512-byte sectors, on top of which you put a 'normal' file system.
242 You may find that the algorithms used in this code are patented
243 unless you live in the Free World where software patents aren't
244 legal - in the USA you are only permitted to use this on PCMCIA
245 hardware, although under the terms of the GPL you're obviously
246 permitted to copy, modify and distribute the code as you wish. Just
250 tristate "NFTL (NAND Flash Translation Layer) support"
254 This provides support for the NAND Flash Translation Layer which is
255 used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
256 file system on a flash device to emulate a block device with
257 512-byte sectors, on top of which you put 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 bool "Write support for NFTL"
270 Support for writing to the NAND Flash Translation Layer, as used
274 tristate "INFTL (Inverse NAND Flash Translation Layer) support"
278 This provides support for the Inverse NAND Flash Translation
279 Layer which is used on M-Systems' newer DiskOnChip devices. It
280 uses a kind of pseudo-file system on a flash device to emulate
281 a block device with 512-byte sectors, on top of which you put
282 a 'normal' file system.
284 You may find that the algorithms used in this code are patented
285 unless you live in the Free World where software patents aren't
286 legal - in the USA you are only permitted to use this on DiskOnChip
287 hardware, although under the terms of the GPL you're obviously
288 permitted to copy, modify and distribute the code as you wish. Just
292 tristate "Resident Flash Disk (Flash Translation Layer) support"
296 This provides support for the flash translation layer known
297 as the Resident Flash Disk (RFD), as used by the Embedded BIOS
298 of General Software. There is a blurb at:
300 http://www.gensw.com/pages/prod/bios/rfd.htm
303 tristate "NAND SSFDC (SmartMedia) read only translation layer"
307 This enables read only access to SmartMedia formatted NAND
308 flash. You can mount it with FAT file system.
312 tristate "SmartMedia/xD new translation layer"
313 depends on EXPERIMENTAL && BLOCK
317 This enables EXPERIMENTAL R/W support for SmartMedia/xD
318 FTL (Flash translation layer).
319 Write support is only lightly tested, therefore this driver
320 isn't recommended to use with valuable data (anyway if you have
321 valuable data, do backups regardless of software/hardware you
322 use, because you never know what will eat your data...)
323 If you only need R/O access, you can use older R/O driver
327 tristate "Log panic/oops to an MTD buffer"
329 This enables panic and oops messages to be logged to a circular
330 buffer in a flash partition where it can be read back at some
333 To use, add console=ttyMTDx to the kernel command line,
334 where x is the MTD device number to use.
336 source "drivers/mtd/chips/Kconfig"
338 source "drivers/mtd/maps/Kconfig"
340 source "drivers/mtd/devices/Kconfig"
342 source "drivers/mtd/nand/Kconfig"
344 source "drivers/mtd/onenand/Kconfig"
346 source "drivers/mtd/lpddr/Kconfig"
348 source "drivers/mtd/ubi/Kconfig"