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 concatenating support"
31 Support for concatenating several MTD devices into a single
32 (virtual) one. This allows you to have -for example- a JFFS(2)
33 file system spanning multiple physical flash chips. If unsure,
37 bool "MTD partitioning support"
39 If you have a device which needs to divide its flash chip(s) up
40 into multiple 'partitions', each of which appears to the user as
41 a separate MTD device, you require this option to be enabled. If
44 Note, however, that you don't need this option for the DiskOnChip
45 devices. Partitioning on NFTL 'devices' is a different - that's the
46 'normal' form of partitioning used on a block device.
48 config MTD_REDBOOT_PARTS
49 tristate "RedBoot partition table parsing"
50 depends on MTD_PARTITIONS
52 RedBoot is a ROM monitor and bootloader which deals with multiple
53 'images' in flash devices by putting a table one of the erase
54 blocks on the device, similar to a partition table, which gives
55 the offsets, lengths and names of all the images stored in the
58 If you need code which can detect and parse this table, and register
59 MTD 'partitions' corresponding to each image in the table, enable
62 You will still need the parsing functions to be called by the driver
63 for your particular device. It won't happen automatically. The
64 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
67 config MTD_REDBOOT_DIRECTORY_BLOCK
68 int "Location of RedBoot partition table"
69 depends on MTD_REDBOOT_PARTS
72 This option is the Linux counterpart to the
73 CYGNUM_REDBOOT_FIS_DIRECTORY_BLOCK RedBoot compile time
76 The option specifies which Flash sectors holds the RedBoot
77 partition table. A zero or positive value gives an absolute
78 erase block number. A negative value specifies a number of
79 sectors before the end of the device.
81 For example "2" means block number 2, "-1" means the last
82 block and "-2" means the penultimate block.
84 config MTD_REDBOOT_PARTS_UNALLOCATED
85 bool "Include unallocated flash regions"
86 depends on MTD_REDBOOT_PARTS
88 If you need to register each unallocated flash region as a MTD
89 'partition', enable this option.
91 config MTD_REDBOOT_PARTS_READONLY
92 bool "Force read-only for RedBoot system images"
93 depends on MTD_REDBOOT_PARTS
95 If you need to force read-only for 'RedBoot', 'RedBoot Config' and
96 'FIS directory' images, enable this option.
98 config MTD_CMDLINE_PARTS
99 bool "Command line partition table parsing"
100 depends on MTD_PARTITIONS = "y" && MTD = "y"
102 Allow generic configuration of the MTD partition tables via the kernel
103 command line. Multiple flash resources are supported for hardware where
104 different kinds of flash memory are available.
106 You will still need the parsing functions to be called by the driver
107 for your particular device. It won't happen automatically. The
108 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
111 The format for the command line is as follows:
113 mtdparts=<mtddef>[;<mtddef]
114 <mtddef> := <mtd-id>:<partdef>[,<partdef>]
115 <partdef> := <size>[@offset][<name>][ro]
116 <mtd-id> := unique id used in mapping driver/device
117 <size> := standard linux memsize OR "-" to denote all
121 Due to the way Linux handles the command line, no spaces are
122 allowed in the partition definition, including mtd id's and partition
127 1 flash resource (mtd-id "sa1100"), with 1 single writable partition:
130 Same flash, but 2 named partitions, the first one being read-only:
131 mtdparts=sa1100:256k(ARMboot)ro,-(root)
136 tristate "ARM Firmware Suite partition parsing"
137 depends on ARM && MTD_PARTITIONS
139 The ARM Firmware Suite allows the user to divide flash devices into
140 multiple 'images'. Each such image has a header containing its name
143 If you need code which can detect and parse these tables, and
144 register MTD 'partitions' corresponding to each image detected,
147 You will still need the parsing functions to be called by the driver
148 for your particular device. It won't happen automatically. The
149 'armflash' map driver (CONFIG_MTD_ARMFLASH) does this, for example.
152 tristate "Flash partition map based on OF description"
153 depends on PPC_OF && MTD_PARTITIONS
155 This provides a partition parsing function which derives
156 the partition map from the children of the flash node,
157 as described in Documentation/powerpc/booting-without-of.txt.
160 tristate "TI AR7 partitioning support"
161 depends on MTD_PARTITIONS
163 TI AR7 partitioning support
165 comment "User Modules And Translation Layers"
168 tristate "Direct char device access to MTD devices"
170 This provides a character device for each MTD device present in
171 the system, allowing the user to read and write directly to the
172 memory chips, and also use ioctl() to obtain information about
173 the device, or to erase parts of it.
178 Enable access to OTP regions using MTD_CHAR.
181 tristate "Common interface to block layer for MTD 'translation layers'"
186 tristate "Caching block device access to MTD devices"
190 Although most flash chips have an erase size too large to be useful
191 as block devices, it is possible to use MTD devices which are based
192 on RAM chips in this manner. This block device is a user of MTD
193 devices performing that function.
195 At the moment, it is also required for the Journalling Flash File
196 System(s) to obtain a handle on the MTD device when it's mounted
197 (although JFFS and JFFS2 don't actually use any of the functionality
198 of the mtdblock device).
200 Later, it may be extended to perform read/erase/modify/write cycles
201 on flash chips to emulate a smaller block size. Needless to say,
202 this is very unsafe, but could be useful for file systems which are
203 almost never written to.
205 You do not need this option for use with the DiskOnChip devices. For
206 those, enable NFTL support (CONFIG_NFTL) instead.
209 tristate "Readonly block device access to MTD devices"
210 depends on MTD_BLOCK!=y && BLOCK
213 This allows you to mount read-only file systems (such as cramfs)
214 from an MTD device, without the overhead (and danger) of the caching
217 You do not need this option for use with the DiskOnChip devices. For
218 those, enable NFTL support (CONFIG_NFTL) instead.
221 tristate "FTL (Flash Translation Layer) support"
225 This provides support for the original Flash Translation Layer which
226 is part of the PCMCIA specification. It uses a kind of pseudo-
227 file system on a flash device to emulate a block device with
228 512-byte sectors, on top of which you put a 'normal' file system.
230 You may find that the algorithms used in this code are patented
231 unless you live in the Free World where software patents aren't
232 legal - in the USA you are only permitted to use this on PCMCIA
233 hardware, although under the terms of the GPL you're obviously
234 permitted to copy, modify and distribute the code as you wish. Just
238 tristate "NFTL (NAND Flash Translation Layer) support"
242 This provides support for the NAND Flash Translation Layer which is
243 used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
244 file system on a flash device to emulate a block device with
245 512-byte sectors, on top of which you put a 'normal' file system.
247 You may find that the algorithms used in this code are patented
248 unless you live in the Free World where software patents aren't
249 legal - in the USA you are only permitted to use this on DiskOnChip
250 hardware, although under the terms of the GPL you're obviously
251 permitted to copy, modify and distribute the code as you wish. Just
255 bool "Write support for NFTL"
258 Support for writing to the NAND Flash Translation Layer, as used
262 tristate "INFTL (Inverse NAND Flash Translation Layer) support"
266 This provides support for the Inverse NAND Flash Translation
267 Layer which is used on M-Systems' newer DiskOnChip devices. It
268 uses a kind of pseudo-file system on a flash device to emulate
269 a block device with 512-byte sectors, on top of which you put
270 a 'normal' file system.
272 You may find that the algorithms used in this code are patented
273 unless you live in the Free World where software patents aren't
274 legal - in the USA you are only permitted to use this on DiskOnChip
275 hardware, although under the terms of the GPL you're obviously
276 permitted to copy, modify and distribute the code as you wish. Just
280 tristate "Resident Flash Disk (Flash Translation Layer) support"
284 This provides support for the flash translation layer known
285 as the Resident Flash Disk (RFD), as used by the Embedded BIOS
286 of General Software. There is a blurb at:
288 http://www.gensw.com/pages/prod/bios/rfd.htm
291 tristate "NAND SSFDC (SmartMedia) read only translation layer"
295 This enables read only access to SmartMedia formatted NAND
296 flash. You can mount it with FAT file system.
299 tristate "Log panic/oops to an MTD buffer"
302 This enables panic and oops messages to be logged to a circular
303 buffer in a flash partition where it can be read back at some
306 To use, add console=ttyMTDx to the kernel command line,
307 where x is the MTD device number to use.
309 source "drivers/mtd/chips/Kconfig"
311 source "drivers/mtd/maps/Kconfig"
313 source "drivers/mtd/devices/Kconfig"
315 source "drivers/mtd/nand/Kconfig"
317 source "drivers/mtd/onenand/Kconfig"
319 source "drivers/mtd/ubi/Kconfig"