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 "Direct char device access to MTD devices"
163 This provides a character device for each MTD device present in
164 the system, allowing the user to read and write directly to the
165 memory chips, and also use ioctl() to obtain information about
166 the device, or to erase parts of it.
171 Enable access to OTP regions using MTD_CHAR.
174 tristate "Common interface to block layer for MTD 'translation layers'"
179 tristate "Caching block device access to MTD devices"
183 Although most flash chips have an erase size too large to be useful
184 as block devices, it is possible to use MTD devices which are based
185 on RAM chips in this manner. This block device is a user of MTD
186 devices performing that function.
188 At the moment, it is also required for the Journalling Flash File
189 System(s) to obtain a handle on the MTD device when it's mounted
190 (although JFFS and JFFS2 don't actually use any of the functionality
191 of the mtdblock device).
193 Later, it may be extended to perform read/erase/modify/write cycles
194 on flash chips to emulate a smaller block size. Needless to say,
195 this is very unsafe, but could be useful for file systems which are
196 almost never written to.
198 You do not need this option for use with the DiskOnChip devices. For
199 those, enable NFTL support (CONFIG_NFTL) instead.
202 tristate "Readonly block device access to MTD devices"
203 depends on MTD_BLOCK!=y && BLOCK
206 This allows you to mount read-only file systems (such as cramfs)
207 from an MTD device, without the overhead (and danger) of the caching
210 You do not need this option for use with the DiskOnChip devices. For
211 those, enable NFTL support (CONFIG_NFTL) instead.
214 tristate "FTL (Flash Translation Layer) support"
218 This provides support for the original Flash Translation Layer which
219 is part of the PCMCIA specification. It uses a kind of pseudo-
220 file system on a flash device to emulate a block device with
221 512-byte sectors, on top of which you put a 'normal' file system.
223 You may find that the algorithms used in this code are patented
224 unless you live in the Free World where software patents aren't
225 legal - in the USA you are only permitted to use this on PCMCIA
226 hardware, although under the terms of the GPL you're obviously
227 permitted to copy, modify and distribute the code as you wish. Just
231 tristate "NFTL (NAND Flash Translation Layer) support"
235 This provides support for the NAND Flash Translation Layer which is
236 used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
237 file system on a flash device to emulate a block device with
238 512-byte sectors, on top of which you put a 'normal' file system.
240 You may find that the algorithms used in this code are patented
241 unless you live in the Free World where software patents aren't
242 legal - in the USA you are only permitted to use this on DiskOnChip
243 hardware, although under the terms of the GPL you're obviously
244 permitted to copy, modify and distribute the code as you wish. Just
248 bool "Write support for NFTL"
251 Support for writing to the NAND Flash Translation Layer, as used
255 tristate "INFTL (Inverse NAND Flash Translation Layer) support"
259 This provides support for the Inverse NAND Flash Translation
260 Layer which is used on M-Systems' newer DiskOnChip devices. It
261 uses a kind of pseudo-file system on a flash device to emulate
262 a block device with 512-byte sectors, on top of which you put
263 a 'normal' file system.
265 You may find that the algorithms used in this code are patented
266 unless you live in the Free World where software patents aren't
267 legal - in the USA you are only permitted to use this on DiskOnChip
268 hardware, although under the terms of the GPL you're obviously
269 permitted to copy, modify and distribute the code as you wish. Just
273 tristate "Resident Flash Disk (Flash Translation Layer) support"
277 This provides support for the flash translation layer known
278 as the Resident Flash Disk (RFD), as used by the Embedded BIOS
279 of General Software. There is a blurb at:
281 http://www.gensw.com/pages/prod/bios/rfd.htm
284 tristate "NAND SSFDC (SmartMedia) read only translation layer"
288 This enables read only access to SmartMedia formatted NAND
289 flash. You can mount it with FAT file system.
293 tristate "SmartMedia/xD new translation layer"
298 This enables EXPERIMENTAL R/W support for SmartMedia/xD
299 FTL (Flash translation layer).
300 Write support is only lightly tested, therefore this driver
301 isn't recommended to use with valuable data (anyway if you have
302 valuable data, do backups regardless of software/hardware you
303 use, because you never know what will eat your data...)
304 If you only need R/O access, you can use older R/O driver
308 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
315 tristate "Swap on MTD device support"
316 depends on MTD && SWAP
319 Provides volatile block device driver on top of mtd partition
320 suitable for swapping. The mapping of written blocks is not saved.
321 The driver provides wear leveling by storing erase counter into the
324 source "drivers/mtd/chips/Kconfig"
326 source "drivers/mtd/maps/Kconfig"
328 source "drivers/mtd/devices/Kconfig"
330 source "drivers/mtd/nand/Kconfig"
332 source "drivers/mtd/onenand/Kconfig"
334 source "drivers/mtd/lpddr/Kconfig"
336 source "drivers/mtd/ubi/Kconfig"