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 tristate "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 config MTD_BCM63XX_PARTS
144 tristate "BCM63XX CFE partitioning support"
148 This provides partions parsing for BCM63xx devices with CFE
151 config MTD_BCM47XX_PARTS
152 tristate "BCM47XX partitioning support"
155 This provides partitions parser for devices based on BCM47xx
158 comment "User Modules And Translation Layers"
161 tristate "Common interface to block layer for MTD 'translation layers'"
166 tristate "Caching block device access to MTD devices"
170 Although most flash chips have an erase size too large to be useful
171 as block devices, it is possible to use MTD devices which are based
172 on RAM chips in this manner. This block device is a user of MTD
173 devices performing that function.
175 At the moment, it is also required for the Journalling Flash File
176 System(s) to obtain a handle on the MTD device when it's mounted
177 (although JFFS and JFFS2 don't actually use any of the functionality
178 of the mtdblock device).
180 Later, it may be extended to perform read/erase/modify/write cycles
181 on flash chips to emulate a smaller block size. Needless to say,
182 this is very unsafe, but could be useful for file systems which are
183 almost never written to.
185 You do not need this option for use with the DiskOnChip devices. For
186 those, enable NFTL support (CONFIG_NFTL) instead.
189 tristate "Readonly block device access to MTD devices"
190 depends on MTD_BLOCK!=y && BLOCK
193 This allows you to mount read-only file systems (such as cramfs)
194 from an MTD device, without the overhead (and danger) of the caching
197 You do not need this option for use with the DiskOnChip devices. For
198 those, enable NFTL support (CONFIG_NFTL) instead.
201 tristate "FTL (Flash Translation Layer) support"
205 This provides support for the original Flash Translation Layer which
206 is part of the PCMCIA specification. It uses a kind of pseudo-
207 file system on a flash device to emulate a block device with
208 512-byte sectors, on top of which you put a 'normal' file system.
210 You may find that the algorithms used in this code are patented
211 unless you live in the Free World where software patents aren't
212 legal - in the USA you are only permitted to use this on PCMCIA
213 hardware, although under the terms of the GPL you're obviously
214 permitted to copy, modify and distribute the code as you wish. Just
218 tristate "NFTL (NAND Flash Translation Layer) support"
222 This provides support for the NAND Flash Translation Layer which is
223 used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
224 file system on a flash device to emulate a block device with
225 512-byte sectors, on top of which you put a 'normal' file system.
227 You may find that the algorithms used in this code are patented
228 unless you live in the Free World where software patents aren't
229 legal - in the USA you are only permitted to use this on DiskOnChip
230 hardware, although under the terms of the GPL you're obviously
231 permitted to copy, modify and distribute the code as you wish. Just
235 bool "Write support for NFTL"
238 Support for writing to the NAND Flash Translation Layer, as used
242 tristate "INFTL (Inverse NAND Flash Translation Layer) support"
246 This provides support for the Inverse NAND Flash Translation
247 Layer which is used on M-Systems' newer DiskOnChip devices. It
248 uses a kind of pseudo-file system on a flash device to emulate
249 a block device with 512-byte sectors, on top of which you put
250 a 'normal' file system.
252 You may find that the algorithms used in this code are patented
253 unless you live in the Free World where software patents aren't
254 legal - in the USA you are only permitted to use this on DiskOnChip
255 hardware, although under the terms of the GPL you're obviously
256 permitted to copy, modify and distribute the code as you wish. Just
260 tristate "Resident Flash Disk (Flash Translation Layer) support"
264 This provides support for the flash translation layer known
265 as the Resident Flash Disk (RFD), as used by the Embedded BIOS
266 of General Software. There is a blurb at:
268 http://www.gensw.com/pages/prod/bios/rfd.htm
271 tristate "NAND SSFDC (SmartMedia) read only translation layer"
275 This enables read only access to SmartMedia formatted NAND
276 flash. You can mount it with FAT file system.
280 tristate "SmartMedia/xD new translation layer"
285 This enables EXPERIMENTAL R/W support for SmartMedia/xD
286 FTL (Flash translation layer).
287 Write support is only lightly tested, therefore this driver
288 isn't recommended to use with valuable data (anyway if you have
289 valuable data, do backups regardless of software/hardware you
290 use, because you never know what will eat your data...)
291 If you only need R/O access, you can use older R/O driver
295 tristate "Log panic/oops to an MTD buffer"
297 This enables panic and oops messages to be logged to a circular
298 buffer in a flash partition where it can be read back at some
302 tristate "Swap on MTD device support"
303 depends on MTD && SWAP
306 Provides volatile block device driver on top of mtd partition
307 suitable for swapping. The mapping of written blocks is not saved.
308 The driver provides wear leveling by storing erase counter into the
311 source "drivers/mtd/chips/Kconfig"
313 source "drivers/mtd/maps/Kconfig"
315 source "drivers/mtd/devices/Kconfig"
317 source "drivers/mtd/nand/Kconfig"
319 source "drivers/mtd/onenand/Kconfig"
321 source "drivers/mtd/lpddr/Kconfig"
323 source "drivers/mtd/ubi/Kconfig"