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.
16 tristate "MTD tests support (DANGEROUS)"
19 This option includes various MTD tests into compilation. The tests
20 should normally be compiled as kernel modules. The modules perform
21 various checks and verifications when loaded.
23 WARNING: some of the tests will ERASE entire MTD device which they
24 test. Do not use these tests unless you really know what you do.
26 config MTD_REDBOOT_PARTS
27 tristate "RedBoot partition table parsing"
29 RedBoot is a ROM monitor and bootloader which deals with multiple
30 'images' in flash devices by putting a table one of the erase
31 blocks on the device, similar to a partition table, which gives
32 the offsets, lengths and names of all the images stored in the
35 If you need code which can detect and parse this table, and register
36 MTD 'partitions' corresponding to each image in the table, enable
39 You will still need the parsing functions to be called by the driver
40 for your particular device. It won't happen automatically. The
41 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
46 config MTD_REDBOOT_DIRECTORY_BLOCK
47 int "Location of RedBoot partition table"
50 This option is the Linux counterpart to the
51 CYGNUM_REDBOOT_FIS_DIRECTORY_BLOCK RedBoot compile time
54 The option specifies which Flash sectors holds the RedBoot
55 partition table. A zero or positive value gives an absolute
56 erase block number. A negative value specifies a number of
57 sectors before the end of the device.
59 For example "2" means block number 2, "-1" means the last
60 block and "-2" means the penultimate block.
62 config MTD_REDBOOT_PARTS_UNALLOCATED
63 bool "Include unallocated flash regions"
65 If you need to register each unallocated flash region as a MTD
66 'partition', enable this option.
68 config MTD_REDBOOT_PARTS_READONLY
69 bool "Force read-only for RedBoot system images"
71 If you need to force read-only for 'RedBoot', 'RedBoot Config' and
72 'FIS directory' images, enable this option.
74 endif # MTD_REDBOOT_PARTS
76 config MTD_CMDLINE_PARTS
77 bool "Command line partition table parsing"
80 Allow generic configuration of the MTD partition tables via the kernel
81 command line. Multiple flash resources are supported for hardware where
82 different kinds of flash memory are available.
84 You will still need the parsing functions to be called by the driver
85 for your particular device. It won't happen automatically. The
86 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
89 The format for the command line is as follows:
91 mtdparts=<mtddef>[;<mtddef]
92 <mtddef> := <mtd-id>:<partdef>[,<partdef>]
93 <partdef> := <size>[@offset][<name>][ro]
94 <mtd-id> := unique id used in mapping driver/device
95 <size> := standard linux memsize OR "-" to denote all
99 Due to the way Linux handles the command line, no spaces are
100 allowed in the partition definition, including mtd id's and partition
105 1 flash resource (mtd-id "sa1100"), with 1 single writable partition:
108 Same flash, but 2 named partitions, the first one being read-only:
109 mtdparts=sa1100:256k(ARMboot)ro,-(root)
114 tristate "ARM Firmware Suite partition parsing"
117 The ARM Firmware Suite allows the user to divide flash devices into
118 multiple 'images'. Each such image has a header containing its name
121 If you need code which can detect and parse these tables, and
122 register MTD 'partitions' corresponding to each image detected,
125 You will still need the parsing functions to be called by the driver
126 for your particular device. It won't happen automatically. The
127 'physmap' map driver (CONFIG_MTD_PHYSMAP) does this, for example.
130 tristate "OpenFirmware partitioning information support"
134 This provides a partition parsing function which derives
135 the partition map from the children of the flash node,
136 as described in Documentation/devicetree/booting-without-of.txt.
139 tristate "TI AR7 partitioning support"
141 TI AR7 partitioning support
143 comment "User Modules And Translation Layers"
146 tristate "Direct char device access to MTD devices"
148 This provides a character device for each MTD device present in
149 the system, allowing the user to read and write directly to the
150 memory chips, and also use ioctl() to obtain information about
151 the device, or to erase parts of it.
156 Enable access to OTP regions using MTD_CHAR.
159 tristate "Common interface to block layer for MTD 'translation layers'"
164 tristate "Caching block device access to MTD devices"
168 Although most flash chips have an erase size too large to be useful
169 as block devices, it is possible to use MTD devices which are based
170 on RAM chips in this manner. This block device is a user of MTD
171 devices performing that function.
173 At the moment, it is also required for the Journalling Flash File
174 System(s) to obtain a handle on the MTD device when it's mounted
175 (although JFFS and JFFS2 don't actually use any of the functionality
176 of the mtdblock device).
178 Later, it may be extended to perform read/erase/modify/write cycles
179 on flash chips to emulate a smaller block size. Needless to say,
180 this is very unsafe, but could be useful for file systems which are
181 almost never written to.
183 You do not need this option for use with the DiskOnChip devices. For
184 those, enable NFTL support (CONFIG_NFTL) instead.
187 tristate "Readonly block device access to MTD devices"
188 depends on MTD_BLOCK!=y && BLOCK
191 This allows you to mount read-only file systems (such as cramfs)
192 from an MTD device, without the overhead (and danger) of the caching
195 You do not need this option for use with the DiskOnChip devices. For
196 those, enable NFTL support (CONFIG_NFTL) instead.
199 tristate "FTL (Flash Translation Layer) support"
203 This provides support for the original Flash Translation Layer which
204 is part of the PCMCIA specification. It uses a kind of pseudo-
205 file system on a flash device to emulate a block device with
206 512-byte sectors, on top of which you put a 'normal' file system.
208 You may find that the algorithms used in this code are patented
209 unless you live in the Free World where software patents aren't
210 legal - in the USA you are only permitted to use this on PCMCIA
211 hardware, although under the terms of the GPL you're obviously
212 permitted to copy, modify and distribute the code as you wish. Just
216 tristate "NFTL (NAND Flash Translation Layer) support"
220 This provides support for the NAND Flash Translation Layer which is
221 used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
222 file system on a flash device to emulate a block device with
223 512-byte sectors, on top of which you put a 'normal' file system.
225 You may find that the algorithms used in this code are patented
226 unless you live in the Free World where software patents aren't
227 legal - in the USA you are only permitted to use this on DiskOnChip
228 hardware, although under the terms of the GPL you're obviously
229 permitted to copy, modify and distribute the code as you wish. Just
233 bool "Write support for NFTL"
236 Support for writing to the NAND Flash Translation Layer, as used
240 tristate "INFTL (Inverse NAND Flash Translation Layer) support"
244 This provides support for the Inverse NAND Flash Translation
245 Layer which is used on M-Systems' newer DiskOnChip devices. It
246 uses a kind of pseudo-file system on a flash device to emulate
247 a block device with 512-byte sectors, on top of which you put
248 a 'normal' file system.
250 You may find that the algorithms used in this code are patented
251 unless you live in the Free World where software patents aren't
252 legal - in the USA you are only permitted to use this on DiskOnChip
253 hardware, although under the terms of the GPL you're obviously
254 permitted to copy, modify and distribute the code as you wish. Just
258 tristate "Resident Flash Disk (Flash Translation Layer) support"
262 This provides support for the flash translation layer known
263 as the Resident Flash Disk (RFD), as used by the Embedded BIOS
264 of General Software. There is a blurb at:
266 http://www.gensw.com/pages/prod/bios/rfd.htm
269 tristate "NAND SSFDC (SmartMedia) read only translation layer"
273 This enables read only access to SmartMedia formatted NAND
274 flash. You can mount it with FAT file system.
278 tristate "SmartMedia/xD new translation layer"
279 depends on EXPERIMENTAL && BLOCK
283 This enables EXPERIMENTAL R/W support for SmartMedia/xD
284 FTL (Flash translation layer).
285 Write support is only lightly tested, therefore this driver
286 isn't recommended to use with valuable data (anyway if you have
287 valuable data, do backups regardless of software/hardware you
288 use, because you never know what will eat your data...)
289 If you only need R/O access, you can use older R/O driver
293 tristate "Log panic/oops to an MTD buffer"
295 This enables panic and oops messages to be logged to a circular
296 buffer in a flash partition where it can be read back at some
299 To use, add console=ttyMTDx to the kernel command line,
300 where x is the MTD device number to use.
303 tristate "Swap on MTD device support"
304 depends on MTD && SWAP
307 Provides volatile block device driver on top of mtd partition
308 suitable for swapping. The mapping of written blocks is not saved.
309 The driver provides wear leveling by storing erase counter into the
312 source "drivers/mtd/chips/Kconfig"
314 source "drivers/mtd/maps/Kconfig"
316 source "drivers/mtd/devices/Kconfig"
318 source "drivers/mtd/nand/Kconfig"
320 source "drivers/mtd/onenand/Kconfig"
322 source "drivers/mtd/lpddr/Kconfig"
324 source "drivers/mtd/ubi/Kconfig"