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.
154 tristate "Flash partition map based on OF description"
155 depends on PPC_OF && MTD_PARTITIONS
157 This provides a partition parsing function which derives
158 the partition map from the children of the flash node,
159 as described in Documentation/powerpc/booting-without-of.txt.
161 comment "User Modules And Translation Layers"
164 tristate "Direct char device access to MTD devices"
166 This provides a character device for each MTD device present in
167 the system, allowing the user to read and write directly to the
168 memory chips, and also use ioctl() to obtain information about
169 the device, or to erase parts of it.
172 tristate "Common interface to block layer for MTD 'translation layers'"
177 tristate "Caching block device access to MTD devices"
181 Although most flash chips have an erase size too large to be useful
182 as block devices, it is possible to use MTD devices which are based
183 on RAM chips in this manner. This block device is a user of MTD
184 devices performing that function.
186 At the moment, it is also required for the Journalling Flash File
187 System(s) to obtain a handle on the MTD device when it's mounted
188 (although JFFS and JFFS2 don't actually use any of the functionality
189 of the mtdblock device).
191 Later, it may be extended to perform read/erase/modify/write cycles
192 on flash chips to emulate a smaller block size. Needless to say,
193 this is very unsafe, but could be useful for file systems which are
194 almost never written to.
196 You do not need this option for use with the DiskOnChip devices. For
197 those, enable NFTL support (CONFIG_NFTL) instead.
200 tristate "Readonly block device access to MTD devices"
201 depends on MTD_BLOCK!=y && BLOCK
204 This allows you to mount read-only file systems (such as cramfs)
205 from an MTD device, without the overhead (and danger) of the caching
208 You do not need this option for use with the DiskOnChip devices. For
209 those, enable NFTL support (CONFIG_NFTL) instead.
212 tristate "FTL (Flash Translation Layer) support"
216 This provides support for the original Flash Translation Layer which
217 is part of the PCMCIA specification. It uses a kind of pseudo-
218 file system on a flash device to emulate a block device with
219 512-byte sectors, on top of which you put a 'normal' file system.
221 You may find that the algorithms used in this code are patented
222 unless you live in the Free World where software patents aren't
223 legal - in the USA you are only permitted to use this on PCMCIA
224 hardware, although under the terms of the GPL you're obviously
225 permitted to copy, modify and distribute the code as you wish. Just
229 tristate "NFTL (NAND Flash Translation Layer) support"
233 This provides support for the NAND Flash Translation Layer which is
234 used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
235 file system on a flash device to emulate a block device with
236 512-byte sectors, on top of which you put a 'normal' file system.
238 You may find that the algorithms used in this code are patented
239 unless you live in the Free World where software patents aren't
240 legal - in the USA you are only permitted to use this on DiskOnChip
241 hardware, although under the terms of the GPL you're obviously
242 permitted to copy, modify and distribute the code as you wish. Just
246 bool "Write support for NFTL"
249 Support for writing to the NAND Flash Translation Layer, as used
253 tristate "INFTL (Inverse NAND Flash Translation Layer) support"
257 This provides support for the Inverse NAND Flash Translation
258 Layer which is used on M-Systems' newer DiskOnChip devices. It
259 uses a kind of pseudo-file system on a flash device to emulate
260 a block device with 512-byte sectors, on top of which you put
261 a 'normal' file system.
263 You may find that the algorithms used in this code are patented
264 unless you live in the Free World where software patents aren't
265 legal - in the USA you are only permitted to use this on DiskOnChip
266 hardware, although under the terms of the GPL you're obviously
267 permitted to copy, modify and distribute the code as you wish. Just
271 tristate "Resident Flash Disk (Flash Translation Layer) support"
275 This provides support for the flash translation layer known
276 as the Resident Flash Disk (RFD), as used by the Embedded BIOS
277 of General Software. There is a blurb at:
279 http://www.gensw.com/pages/prod/bios/rfd.htm
282 tristate "NAND SSFDC (SmartMedia) read only translation layer"
286 This enables read only access to SmartMedia formatted NAND
287 flash. You can mount it with FAT file system.
290 tristate "Log panic/oops to an MTD buffer"
293 This enables panic and oops messages to be logged to a circular
294 buffer in a flash partition where it can be read back at some
297 To use, add console=ttyMTDx to the kernel command line,
298 where x is the MTD device number to use.
300 source "drivers/mtd/chips/Kconfig"
302 source "drivers/mtd/maps/Kconfig"
304 source "drivers/mtd/devices/Kconfig"
306 source "drivers/mtd/nand/Kconfig"
308 source "drivers/mtd/onenand/Kconfig"
310 source "drivers/mtd/ubi/Kconfig"