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.
56 config MTD_REDBOOT_PARTS
57 tristate "RedBoot partition table parsing"
58 depends on MTD_PARTITIONS
60 RedBoot is a ROM monitor and bootloader which deals with multiple
61 'images' in flash devices by putting a table one of the erase
62 blocks on the device, similar to a partition table, which gives
63 the offsets, lengths and names of all the images stored in the
66 If you need code which can detect and parse this table, and register
67 MTD 'partitions' corresponding to each image in the table, enable
70 You will still need the parsing functions to be called by the driver
71 for your particular device. It won't happen automatically. The
72 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
75 config MTD_REDBOOT_DIRECTORY_BLOCK
76 int "Location of RedBoot partition table"
77 depends on MTD_REDBOOT_PARTS
80 This option is the Linux counterpart to the
81 CYGNUM_REDBOOT_FIS_DIRECTORY_BLOCK RedBoot compile time
84 The option specifies which Flash sectors holds the RedBoot
85 partition table. A zero or positive value gives an absolute
86 erase block number. A negative value specifies a number of
87 sectors before the end of the device.
89 For example "2" means block number 2, "-1" means the last
90 block and "-2" means the penultimate block.
92 config MTD_REDBOOT_PARTS_UNALLOCATED
93 bool "Include unallocated flash regions"
94 depends on MTD_REDBOOT_PARTS
96 If you need to register each unallocated flash region as a MTD
97 'partition', enable this option.
99 config MTD_REDBOOT_PARTS_READONLY
100 bool "Force read-only for RedBoot system images"
101 depends on MTD_REDBOOT_PARTS
103 If you need to force read-only for 'RedBoot', 'RedBoot Config' and
104 'FIS directory' images, enable this option.
106 config MTD_CMDLINE_PARTS
107 bool "Command line partition table parsing"
108 depends on MTD_PARTITIONS = "y" && MTD = "y"
110 Allow generic configuration of the MTD partition tables via the kernel
111 command line. Multiple flash resources are supported for hardware where
112 different kinds of flash memory are available.
114 You will still need the parsing functions to be called by the driver
115 for your particular device. It won't happen automatically. The
116 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
119 The format for the command line is as follows:
121 mtdparts=<mtddef>[;<mtddef]
122 <mtddef> := <mtd-id>:<partdef>[,<partdef>]
123 <partdef> := <size>[@offset][<name>][ro]
124 <mtd-id> := unique id used in mapping driver/device
125 <size> := standard linux memsize OR "-" to denote all
129 Due to the way Linux handles the command line, no spaces are
130 allowed in the partition definition, including mtd id's and partition
135 1 flash resource (mtd-id "sa1100"), with 1 single writable partition:
138 Same flash, but 2 named partitions, the first one being read-only:
139 mtdparts=sa1100:256k(ARMboot)ro,-(root)
144 tristate "ARM Firmware Suite partition parsing"
145 depends on ARM && MTD_PARTITIONS
147 The ARM Firmware Suite allows the user to divide flash devices into
148 multiple 'images'. Each such image has a header containing its name
151 If you need code which can detect and parse these tables, and
152 register MTD 'partitions' corresponding to each image detected,
155 You will still need the parsing functions to be called by the driver
156 for your particular device. It won't happen automatically. The
157 'armflash' map driver (CONFIG_MTD_ARM_INTEGRATOR) does this, for
161 tristate "Flash partition map based on OF description"
162 depends on (MICROBLAZE || PPC_OF) && MTD_PARTITIONS
164 This provides a partition parsing function which derives
165 the partition map from the children of the flash node,
166 as described in Documentation/powerpc/booting-without-of.txt.
169 tristate "TI AR7 partitioning support"
170 depends on MTD_PARTITIONS
172 TI AR7 partitioning support
174 comment "User Modules And Translation Layers"
177 tristate "Direct char device access to MTD devices"
179 This provides a character device for each MTD device present in
180 the system, allowing the user to read and write directly to the
181 memory chips, and also use ioctl() to obtain information about
182 the device, or to erase parts of it.
187 Enable access to OTP regions using MTD_CHAR.
190 tristate "Common interface to block layer for MTD 'translation layers'"
195 tristate "Caching block device access to MTD devices"
199 Although most flash chips have an erase size too large to be useful
200 as block devices, it is possible to use MTD devices which are based
201 on RAM chips in this manner. This block device is a user of MTD
202 devices performing that function.
204 At the moment, it is also required for the Journalling Flash File
205 System(s) to obtain a handle on the MTD device when it's mounted
206 (although JFFS and JFFS2 don't actually use any of the functionality
207 of the mtdblock device).
209 Later, it may be extended to perform read/erase/modify/write cycles
210 on flash chips to emulate a smaller block size. Needless to say,
211 this is very unsafe, but could be useful for file systems which are
212 almost never written to.
214 You do not need this option for use with the DiskOnChip devices. For
215 those, enable NFTL support (CONFIG_NFTL) instead.
218 tristate "Readonly block device access to MTD devices"
219 depends on MTD_BLOCK!=y && BLOCK
222 This allows you to mount read-only file systems (such as cramfs)
223 from an MTD device, without the overhead (and danger) of the caching
226 You do not need this option for use with the DiskOnChip devices. For
227 those, enable NFTL support (CONFIG_NFTL) instead.
230 tristate "FTL (Flash Translation Layer) support"
234 This provides support for the original Flash Translation Layer which
235 is part of the PCMCIA specification. It uses a kind of pseudo-
236 file system on a flash device to emulate a block device with
237 512-byte sectors, on top of which you put a 'normal' file system.
239 You may find that the algorithms used in this code are patented
240 unless you live in the Free World where software patents aren't
241 legal - in the USA you are only permitted to use this on PCMCIA
242 hardware, although under the terms of the GPL you're obviously
243 permitted to copy, modify and distribute the code as you wish. Just
247 tristate "NFTL (NAND Flash Translation Layer) support"
251 This provides support for the NAND Flash Translation Layer which is
252 used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
253 file system on a flash device to emulate a block device with
254 512-byte sectors, on top of which you put a 'normal' file system.
256 You may find that the algorithms used in this code are patented
257 unless you live in the Free World where software patents aren't
258 legal - in the USA you are only permitted to use this on DiskOnChip
259 hardware, although under the terms of the GPL you're obviously
260 permitted to copy, modify and distribute the code as you wish. Just
264 bool "Write support for NFTL"
267 Support for writing to the NAND Flash Translation Layer, as used
271 tristate "INFTL (Inverse NAND Flash Translation Layer) support"
275 This provides support for the Inverse NAND Flash Translation
276 Layer which is used on M-Systems' newer DiskOnChip devices. It
277 uses a kind of pseudo-file system on a flash device to emulate
278 a block device with 512-byte sectors, on top of which you put
279 a 'normal' file system.
281 You may find that the algorithms used in this code are patented
282 unless you live in the Free World where software patents aren't
283 legal - in the USA you are only permitted to use this on DiskOnChip
284 hardware, although under the terms of the GPL you're obviously
285 permitted to copy, modify and distribute the code as you wish. Just
289 tristate "Resident Flash Disk (Flash Translation Layer) support"
293 This provides support for the flash translation layer known
294 as the Resident Flash Disk (RFD), as used by the Embedded BIOS
295 of General Software. There is a blurb at:
297 http://www.gensw.com/pages/prod/bios/rfd.htm
300 tristate "NAND SSFDC (SmartMedia) read only translation layer"
304 This enables read only access to SmartMedia formatted NAND
305 flash. You can mount it with FAT file system.
308 tristate "Log panic/oops to an MTD buffer"
311 This enables panic and oops messages to be logged to a circular
312 buffer in a flash partition where it can be read back at some
315 To use, add console=ttyMTDx to the kernel command line,
316 where x is the MTD device number to use.
318 source "drivers/mtd/chips/Kconfig"
320 source "drivers/mtd/maps/Kconfig"
322 source "drivers/mtd/devices/Kconfig"
324 source "drivers/mtd/nand/Kconfig"
326 source "drivers/mtd/onenand/Kconfig"
328 source "drivers/mtd/lpddr/Kconfig"
330 source "drivers/mtd/ubi/Kconfig"