2 tristate "Memory Technology Device (MTD) support"
4 Memory Technology Devices are flash, RAM and similar chips, often
5 used for solid state file systems on embedded devices. This option
6 will provide the generic support for MTD drivers to register
7 themselves with the kernel and for potential users of MTD devices
8 to enumerate the devices which are present and obtain a handle on
9 them. It will also allow you to select individual drivers for
10 particular hardware and users of MTD devices. If unsure, say N.
15 tristate "MTD tests support (DANGEROUS)"
18 This option includes various MTD tests into compilation. The tests
19 should normally be compiled as kernel modules. The modules perform
20 various checks and verifications when loaded.
22 WARNING: some of the tests will ERASE entire MTD device which they
23 test. Do not use these tests unless you really know what you do.
25 config MTD_REDBOOT_PARTS
26 tristate "RedBoot partition table parsing"
28 RedBoot is a ROM monitor and bootloader which deals with multiple
29 'images' in flash devices by putting a table one of the erase
30 blocks on the device, similar to a partition table, which gives
31 the offsets, lengths and names of all the images stored in the
34 If you need code which can detect and parse this table, and register
35 MTD 'partitions' corresponding to each image in the table, enable
38 You will still need the parsing functions to be called by the driver
39 for your particular device. It won't happen automatically. The
40 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
45 config MTD_REDBOOT_DIRECTORY_BLOCK
46 int "Location of RedBoot partition table"
49 This option is the Linux counterpart to the
50 CYGNUM_REDBOOT_FIS_DIRECTORY_BLOCK RedBoot compile time
53 The option specifies which Flash sectors holds the RedBoot
54 partition table. A zero or positive value gives an absolute
55 erase block number. A negative value specifies a number of
56 sectors before the end of the device.
58 For example "2" means block number 2, "-1" means the last
59 block and "-2" means the penultimate block.
61 config MTD_REDBOOT_PARTS_UNALLOCATED
62 bool "Include unallocated flash regions"
64 If you need to register each unallocated flash region as a MTD
65 'partition', enable this option.
67 config MTD_REDBOOT_PARTS_READONLY
68 bool "Force read-only for RedBoot system images"
70 If you need to force read-only for 'RedBoot', 'RedBoot Config' and
71 'FIS directory' images, enable this option.
73 endif # MTD_REDBOOT_PARTS
75 config MTD_CMDLINE_PARTS
76 tristate "Command line partition table parsing"
79 Allow generic configuration of the MTD partition tables via the kernel
80 command line. Multiple flash resources are supported for hardware where
81 different kinds of flash memory are available.
83 You will still need the parsing functions to be called by the driver
84 for your particular device. It won't happen automatically. The
85 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
88 The format for the command line is as follows:
90 mtdparts=<mtddef>[;<mtddef]
91 <mtddef> := <mtd-id>:<partdef>[,<partdef>]
92 <partdef> := <size>[@offset][<name>][ro]
93 <mtd-id> := unique id used in mapping driver/device
94 <size> := standard linux memsize OR "-" to denote all
98 Due to the way Linux handles the command line, no spaces are
99 allowed in the partition definition, including mtd id's and partition
104 1 flash resource (mtd-id "sa1100"), with 1 single writable partition:
107 Same flash, but 2 named partitions, the first one being read-only:
108 mtdparts=sa1100:256k(ARMboot)ro,-(root)
113 tristate "ARM Firmware Suite partition parsing"
114 depends on (ARM || ARM64)
116 The ARM Firmware Suite allows the user to divide flash devices into
117 multiple 'images'. Each such image has a header containing its name
120 If you need code which can detect and parse these tables, and
121 register MTD 'partitions' corresponding to each image detected,
124 You will still need the parsing functions to be called by the driver
125 for your particular device. It won't happen automatically. The
126 'physmap' map driver (CONFIG_MTD_PHYSMAP) does this, for example.
129 tristate "OpenFirmware partitioning information support"
133 This provides a partition parsing function which derives
134 the partition map from the children of the flash node,
135 as described in Documentation/devicetree/bindings/mtd/partition.txt.
138 tristate "TI AR7 partitioning support"
140 TI AR7 partitioning support
142 config MTD_BCM63XX_PARTS
143 tristate "BCM63XX CFE partitioning support"
144 depends on BCM63XX || BMIPS_GENERIC || COMPILE_TEST
147 This provides partions parsing for BCM63xx devices with CFE
150 config MTD_BCM47XX_PARTS
151 tristate "BCM47XX partitioning support"
152 depends on BCM47XX || ARCH_BCM_5301X
154 This provides partitions parser for devices based on BCM47xx
157 menu "Partition parsers"
158 source "drivers/mtd/parsers/Kconfig"
161 comment "User Modules And Translation Layers"
164 # MTD block device support is select'ed if needed
170 tristate "Caching block device access to MTD devices"
174 Although most flash chips have an erase size too large to be useful
175 as block devices, it is possible to use MTD devices which are based
176 on RAM chips in this manner. This block device is a user of MTD
177 devices performing that function.
179 At the moment, it is also required for the Journalling Flash File
180 System(s) to obtain a handle on the MTD device when it's mounted
181 (although JFFS and JFFS2 don't actually use any of the functionality
182 of the mtdblock device).
184 Later, it may be extended to perform read/erase/modify/write cycles
185 on flash chips to emulate a smaller block size. Needless to say,
186 this is very unsafe, but could be useful for file systems which are
187 almost never written to.
189 You do not need this option for use with the DiskOnChip devices. For
190 those, enable NFTL support (CONFIG_NFTL) instead.
193 tristate "Readonly block device access to MTD devices"
194 depends on MTD_BLOCK!=y && BLOCK
197 This allows you to mount read-only file systems (such as cramfs)
198 from an MTD device, without the overhead (and danger) of the caching
201 You do not need this option for use with the DiskOnChip devices. For
202 those, enable NFTL support (CONFIG_NFTL) instead.
205 tristate "FTL (Flash Translation Layer) support"
209 This provides support for the original Flash Translation Layer which
210 is part of the PCMCIA specification. It uses a kind of pseudo-
211 file system on a flash device to emulate a block device with
212 512-byte sectors, on top of which you put a 'normal' file system.
214 You may find that the algorithms used in this code are patented
215 unless you live in the Free World where software patents aren't
216 legal - in the USA you are only permitted to use this on PCMCIA
217 hardware, although under the terms of the GPL you're obviously
218 permitted to copy, modify and distribute the code as you wish. Just
222 tristate "NFTL (NAND Flash Translation Layer) support"
226 This provides support for the NAND Flash Translation Layer which is
227 used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
228 file system on a flash device to emulate a block device with
229 512-byte sectors, on top of which you put a 'normal' file system.
231 You may find that the algorithms used in this code are patented
232 unless you live in the Free World where software patents aren't
233 legal - in the USA you are only permitted to use this on DiskOnChip
234 hardware, although under the terms of the GPL you're obviously
235 permitted to copy, modify and distribute the code as you wish. Just
239 bool "Write support for NFTL"
242 Support for writing to the NAND Flash Translation Layer, as used
246 tristate "INFTL (Inverse NAND Flash Translation Layer) support"
250 This provides support for the Inverse NAND Flash Translation
251 Layer which is used on M-Systems' newer DiskOnChip devices. It
252 uses a kind of pseudo-file system on a flash device to emulate
253 a block device with 512-byte sectors, on top of which you put
254 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 tristate "Resident Flash Disk (Flash Translation Layer) support"
268 This provides support for the flash translation layer known
269 as the Resident Flash Disk (RFD), as used by the Embedded BIOS
270 of General Software. There is a blurb at:
272 http://www.gensw.com/pages/prod/bios/rfd.htm
275 tristate "NAND SSFDC (SmartMedia) read only translation layer"
279 This enables read only access to SmartMedia formatted NAND
280 flash. You can mount it with FAT file system.
284 tristate "SmartMedia/xD new translation layer"
289 This enables EXPERIMENTAL R/W support for SmartMedia/xD
290 FTL (Flash translation layer).
291 Write support is only lightly tested, therefore this driver
292 isn't recommended to use with valuable data (anyway if you have
293 valuable data, do backups regardless of software/hardware you
294 use, because you never know what will eat your data...)
295 If you only need R/O access, you can use older R/O driver
299 tristate "Log panic/oops to an MTD buffer"
301 This enables panic and oops messages to be logged to a circular
302 buffer in a flash partition where it can be read back at some
306 tristate "Swap on MTD device support"
307 depends on MTD && SWAP
310 Provides volatile block device driver on top of mtd partition
311 suitable for swapping. The mapping of written blocks is not saved.
312 The driver provides wear leveling by storing erase counter into the
315 config MTD_PARTITIONED_MASTER
316 bool "Retain master device when partitioned"
320 For historical reasons, by default, either a master is present or
321 several partitions are present, but not both. The concern was that
322 data listed in multiple partitions was dangerous; however, SCSI does
323 this and it is frequently useful for applications. This config option
324 leaves the master in even if the device is partitioned. It also makes
325 the parent of the partition device be the master device, rather than
326 what lies behind the master.
328 source "drivers/mtd/chips/Kconfig"
330 source "drivers/mtd/maps/Kconfig"
332 source "drivers/mtd/devices/Kconfig"
334 source "drivers/mtd/nand/Kconfig"
336 source "drivers/mtd/onenand/Kconfig"
338 source "drivers/mtd/lpddr/Kconfig"
340 source "drivers/mtd/spi-nor/Kconfig"
342 source "drivers/mtd/ubi/Kconfig"