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.
49 tristate "MTD tests support"
52 This option includes various MTD tests into compilation. The tests
53 should normally be compiled as kernel modules. The modules perform
54 various checks and verifications when loaded.
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_ARMFLASH) does this, for example.
160 tristate "Flash partition map based on OF description"
161 depends on PPC_OF && MTD_PARTITIONS
163 This provides a partition parsing function which derives
164 the partition map from the children of the flash node,
165 as described in Documentation/powerpc/booting-without-of.txt.
168 tristate "TI AR7 partitioning support"
169 depends on MTD_PARTITIONS
171 TI AR7 partitioning support
173 comment "User Modules And Translation Layers"
176 tristate "Direct char device access to MTD devices"
178 This provides a character device for each MTD device present in
179 the system, allowing the user to read and write directly to the
180 memory chips, and also use ioctl() to obtain information about
181 the device, or to erase parts of it.
186 Enable access to OTP regions using MTD_CHAR.
189 tristate "Common interface to block layer for MTD 'translation layers'"
194 tristate "Caching block device access to MTD devices"
198 Although most flash chips have an erase size too large to be useful
199 as block devices, it is possible to use MTD devices which are based
200 on RAM chips in this manner. This block device is a user of MTD
201 devices performing that function.
203 At the moment, it is also required for the Journalling Flash File
204 System(s) to obtain a handle on the MTD device when it's mounted
205 (although JFFS and JFFS2 don't actually use any of the functionality
206 of the mtdblock device).
208 Later, it may be extended to perform read/erase/modify/write cycles
209 on flash chips to emulate a smaller block size. Needless to say,
210 this is very unsafe, but could be useful for file systems which are
211 almost never written to.
213 You do not need this option for use with the DiskOnChip devices. For
214 those, enable NFTL support (CONFIG_NFTL) instead.
217 tristate "Readonly block device access to MTD devices"
218 depends on MTD_BLOCK!=y && BLOCK
221 This allows you to mount read-only file systems (such as cramfs)
222 from an MTD device, without the overhead (and danger) of the caching
225 You do not need this option for use with the DiskOnChip devices. For
226 those, enable NFTL support (CONFIG_NFTL) instead.
229 tristate "FTL (Flash Translation Layer) support"
233 This provides support for the original Flash Translation Layer which
234 is part of the PCMCIA specification. It uses a kind of pseudo-
235 file system on a flash device to emulate a block device with
236 512-byte sectors, on top of which you put a 'normal' file system.
238 You may find that the algorithms used in this code are patented
239 unless you live in the Free World where software patents aren't
240 legal - in the USA you are only permitted to use this on PCMCIA
241 hardware, although under the terms of the GPL you're obviously
242 permitted to copy, modify and distribute the code as you wish. Just
246 tristate "NFTL (NAND Flash Translation Layer) support"
250 This provides support for the NAND Flash Translation Layer which is
251 used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
252 file system on a flash device to emulate a block device with
253 512-byte sectors, on top of which you put a 'normal' file system.
255 You may find that the algorithms used in this code are patented
256 unless you live in the Free World where software patents aren't
257 legal - in the USA you are only permitted to use this on DiskOnChip
258 hardware, although under the terms of the GPL you're obviously
259 permitted to copy, modify and distribute the code as you wish. Just
263 bool "Write support for NFTL"
266 Support for writing to the NAND Flash Translation Layer, as used
270 tristate "INFTL (Inverse NAND Flash Translation Layer) support"
274 This provides support for the Inverse NAND Flash Translation
275 Layer which is used on M-Systems' newer DiskOnChip devices. It
276 uses a kind of pseudo-file system on a flash device to emulate
277 a block device with 512-byte sectors, on top of which you put
278 a 'normal' file system.
280 You may find that the algorithms used in this code are patented
281 unless you live in the Free World where software patents aren't
282 legal - in the USA you are only permitted to use this on DiskOnChip
283 hardware, although under the terms of the GPL you're obviously
284 permitted to copy, modify and distribute the code as you wish. Just
288 tristate "Resident Flash Disk (Flash Translation Layer) support"
292 This provides support for the flash translation layer known
293 as the Resident Flash Disk (RFD), as used by the Embedded BIOS
294 of General Software. There is a blurb at:
296 http://www.gensw.com/pages/prod/bios/rfd.htm
299 tristate "NAND SSFDC (SmartMedia) read only translation layer"
303 This enables read only access to SmartMedia formatted NAND
304 flash. You can mount it with FAT file system.
307 tristate "Log panic/oops to an MTD buffer"
310 This enables panic and oops messages to be logged to a circular
311 buffer in a flash partition where it can be read back at some
314 To use, add console=ttyMTDx to the kernel command line,
315 where x is the MTD device number to use.
317 source "drivers/mtd/chips/Kconfig"
319 source "drivers/mtd/maps/Kconfig"
321 source "drivers/mtd/devices/Kconfig"
323 source "drivers/mtd/nand/Kconfig"
325 source "drivers/mtd/onenand/Kconfig"
327 source "drivers/mtd/lpddr/Kconfig"
329 source "drivers/mtd/ubi/Kconfig"