1 # $Id: Kconfig,v 1.11 2005/11/07 11:14:19 gleixner Exp $
4 tristate "Memory Technology Device (MTD) support"
7 Memory Technology Devices are flash, RAM and similar chips, often
8 used for solid state file systems on embedded devices. This option
9 will provide the generic support for MTD drivers to register
10 themselves with the kernel and for potential users of MTD devices
11 to enumerate the devices which are present and obtain a handle on
12 them. It will also allow you to select individual drivers for
13 particular hardware and users of MTD devices. If unsure, say N.
20 This turns on low-level debugging for the entire MTD sub-system.
21 Normally, you should say 'N'.
23 config MTD_DEBUG_VERBOSE
24 int "Debugging verbosity (0 = quiet, 3 = noisy)"
28 Determines the verbosity level of the MTD debugging messages.
31 tristate "MTD concatenating support"
33 Support for concatenating several MTD devices into a single
34 (virtual) one. This allows you to have -for example- a JFFS(2)
35 file system spanning multiple physical flash chips. If unsure,
39 bool "MTD partitioning support"
41 If you have a device which needs to divide its flash chip(s) up
42 into multiple 'partitions', each of which appears to the user as
43 a separate MTD device, you require this option to be enabled. If
46 Note, however, that you don't need this option for the DiskOnChip
47 devices. Partitioning on NFTL 'devices' is a different - that's the
48 'normal' form of partitioning used on a block device.
50 config MTD_REDBOOT_PARTS
51 tristate "RedBoot partition table parsing"
52 depends on MTD_PARTITIONS
54 RedBoot is a ROM monitor and bootloader which deals with multiple
55 'images' in flash devices by putting a table one of the erase
56 blocks on the device, similar to a partition table, which gives
57 the offsets, lengths and names of all the images stored in the
60 If you need code which can detect and parse this table, and register
61 MTD 'partitions' corresponding to each image in the table, enable
64 You will still need the parsing functions to be called by the driver
65 for your particular device. It won't happen automatically. The
66 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
69 config MTD_REDBOOT_DIRECTORY_BLOCK
70 int "Location of RedBoot partition table"
71 depends on MTD_REDBOOT_PARTS
74 This option is the Linux counterpart to the
75 CYGNUM_REDBOOT_FIS_DIRECTORY_BLOCK RedBoot compile time
78 The option specifies which Flash sectors holds the RedBoot
79 partition table. A zero or positive value gives an absolute
80 erase block number. A negative value specifies a number of
81 sectors before the end of the device.
83 For example "2" means block number 2, "-1" means the last
84 block and "-2" means the penultimate block.
86 config MTD_REDBOOT_PARTS_UNALLOCATED
87 bool "Include unallocated flash regions"
88 depends on MTD_REDBOOT_PARTS
90 If you need to register each unallocated flash region as a MTD
91 'partition', enable this option.
93 config MTD_REDBOOT_PARTS_READONLY
94 bool "Force read-only for RedBoot system images"
95 depends on MTD_REDBOOT_PARTS
97 If you need to force read-only for 'RedBoot', 'RedBoot Config' and
98 'FIS directory' images, enable this option.
100 config MTD_CMDLINE_PARTS
101 bool "Command line partition table parsing"
102 depends on MTD_PARTITIONS = "y" && MTD = "y"
104 Allow generic configuration of the MTD partition tables via the kernel
105 command line. Multiple flash resources are supported for hardware where
106 different kinds of flash memory are available.
108 You will still need the parsing functions to be called by the driver
109 for your particular device. It won't happen automatically. The
110 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
113 The format for the command line is as follows:
115 mtdparts=<mtddef>[;<mtddef]
116 <mtddef> := <mtd-id>:<partdef>[,<partdef>]
117 <partdef> := <size>[@offset][<name>][ro]
118 <mtd-id> := unique id used in mapping driver/device
119 <size> := standard linux memsize OR "-" to denote all
123 Due to the way Linux handles the command line, no spaces are
124 allowed in the partition definition, including mtd id's and partition
129 1 flash resource (mtd-id "sa1100"), with 1 single writable partition:
132 Same flash, but 2 named partitions, the first one being read-only:
133 mtdparts=sa1100:256k(ARMboot)ro,-(root)
138 tristate "ARM Firmware Suite partition parsing"
139 depends on ARM && MTD_PARTITIONS
141 The ARM Firmware Suite allows the user to divide flash devices into
142 multiple 'images'. Each such image has a header containing its name
145 If you need code which can detect and parse these tables, and
146 register MTD 'partitions' corresponding to each image detected,
149 You will still need the parsing functions to be called by the driver
150 for your particular device. It won't happen automatically. The
151 'armflash' map driver (CONFIG_MTD_ARMFLASH) does this, for example.
153 comment "User Modules And Translation Layers"
156 tristate "Direct char device access to MTD devices"
158 This provides a character device for each MTD device present in
159 the system, allowing the user to read and write directly to the
160 memory chips, and also use ioctl() to obtain information about
161 the device, or to erase parts of it.
164 tristate "Common interface to block layer for MTD 'translation layers'"
169 tristate "Caching block device access to MTD devices"
173 Although most flash chips have an erase size too large to be useful
174 as block devices, it is possible to use MTD devices which are based
175 on RAM chips in this manner. This block device is a user of MTD
176 devices performing that function.
178 At the moment, it is also required for the Journalling Flash File
179 System(s) to obtain a handle on the MTD device when it's mounted
180 (although JFFS and JFFS2 don't actually use any of the functionality
181 of the mtdblock device).
183 Later, it may be extended to perform read/erase/modify/write cycles
184 on flash chips to emulate a smaller block size. Needless to say,
185 this is very unsafe, but could be useful for file systems which are
186 almost never written to.
188 You do not need this option for use with the DiskOnChip devices. For
189 those, enable NFTL support (CONFIG_NFTL) instead.
192 tristate "Readonly block device access to MTD devices"
193 depends on MTD_BLOCK!=y && BLOCK
196 This allows you to mount read-only file systems (such as cramfs)
197 from an MTD device, without the overhead (and danger) of the caching
200 You do not need this option for use with the DiskOnChip devices. For
201 those, enable NFTL support (CONFIG_NFTL) instead.
204 tristate "FTL (Flash Translation Layer) support"
208 This provides support for the original Flash Translation Layer which
209 is part of the PCMCIA specification. It uses a kind of pseudo-
210 file system on a flash device to emulate a block device with
211 512-byte sectors, on top of which you put a 'normal' file system.
213 You may find that the algorithms used in this code are patented
214 unless you live in the Free World where software patents aren't
215 legal - in the USA you are only permitted to use this on PCMCIA
216 hardware, although under the terms of the GPL you're obviously
217 permitted to copy, modify and distribute the code as you wish. Just
221 tristate "NFTL (NAND Flash Translation Layer) support"
225 This provides support for the NAND Flash Translation Layer which is
226 used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
227 file system on a flash device to emulate a block device with
228 512-byte sectors, on top of which you put a 'normal' file system.
230 You may find that the algorithms used in this code are patented
231 unless you live in the Free World where software patents aren't
232 legal - in the USA you are only permitted to use this on DiskOnChip
233 hardware, although under the terms of the GPL you're obviously
234 permitted to copy, modify and distribute the code as you wish. Just
238 bool "Write support for NFTL"
241 Support for writing to the NAND Flash Translation Layer, as used
245 tristate "INFTL (Inverse NAND Flash Translation Layer) support"
249 This provides support for the Inverse NAND Flash Translation
250 Layer which is used on M-Systems' newer DiskOnChip devices. It
251 uses a kind of pseudo-file system on a flash device to emulate
252 a block device with 512-byte sectors, on top of which you put
253 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 tristate "Resident Flash Disk (Flash Translation Layer) support"
267 This provides support for the flash translation layer known
268 as the Resident Flash Disk (RFD), as used by the Embedded BIOS
269 of General Software. There is a blurb at:
271 http://www.gensw.com/pages/prod/bios/rfd.htm
274 tristate "NAND SSFDC (SmartMedia) read only translation layer"
278 This enables read only access to SmartMedia formatted NAND
279 flash. You can mount it with FAT file system.
281 source "drivers/mtd/chips/Kconfig"
283 source "drivers/mtd/maps/Kconfig"
285 source "drivers/mtd/devices/Kconfig"
287 source "drivers/mtd/nand/Kconfig"
289 source "drivers/mtd/onenand/Kconfig"
291 source "drivers/mtd/ubi/Kconfig"