1 # $Id: Kconfig,v 1.11 2005/11/07 11:14:19 gleixner Exp $
3 menu "Memory Technology Devices (MTD)"
6 tristate "Memory Technology Device (MTD) support"
8 Memory Technology Devices are flash, RAM and similar chips, often
9 used for solid state file systems on embedded devices. This option
10 will provide the generic support for MTD drivers to register
11 themselves with the kernel and for potential users of MTD devices
12 to enumerate the devices which are present and obtain a handle on
13 them. It will also allow you to select individual drivers for
14 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"
34 Support for concatenating several MTD devices into a single
35 (virtual) one. This allows you to have -for example- a JFFS(2)
36 file system spanning multiple physical flash chips. If unsure,
40 bool "MTD partitioning support"
43 If you have a device which needs to divide its flash chip(s) up
44 into multiple 'partitions', each of which appears to the user as
45 a separate MTD device, you require this option to be enabled. If
48 Note, however, that you don't need this option for the DiskOnChip
49 devices. Partitioning on NFTL 'devices' is a different - that's the
50 'normal' form of partitioning used on a block device.
52 config MTD_REDBOOT_PARTS
53 tristate "RedBoot partition table parsing"
54 depends on MTD_PARTITIONS
56 RedBoot is a ROM monitor and bootloader which deals with multiple
57 'images' in flash devices by putting a table one of the erase
58 blocks on the device, similar to a partition table, which gives
59 the offsets, lengths and names of all the images stored in the
62 If you need code which can detect and parse this table, and register
63 MTD 'partitions' corresponding to each image in the table, enable
66 You will still need the parsing functions to be called by the driver
67 for your particular device. It won't happen automatically. The
68 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
71 config MTD_REDBOOT_DIRECTORY_BLOCK
72 int "Location of RedBoot partition table"
73 depends on MTD_REDBOOT_PARTS
76 This option is the Linux counterpart to the
77 CYGNUM_REDBOOT_FIS_DIRECTORY_BLOCK RedBoot compile time
80 The option specifies which Flash sectors holds the RedBoot
81 partition table. A zero or positive value gives an absolute
82 erase block number. A negative value specifies a number of
83 sectors before the end of the device.
85 For example "2" means block number 2, "-1" means the last
86 block and "-2" means the penultimate block.
88 config MTD_REDBOOT_PARTS_UNALLOCATED
89 bool "Include unallocated flash regions"
90 depends on MTD_REDBOOT_PARTS
92 If you need to register each unallocated flash region as a MTD
93 'partition', enable this option.
95 config MTD_REDBOOT_PARTS_READONLY
96 bool "Force read-only for RedBoot system images"
97 depends on MTD_REDBOOT_PARTS
99 If you need to force read-only for 'RedBoot', 'RedBoot Config' and
100 'FIS directory' images, enable this option.
102 config MTD_CMDLINE_PARTS
103 bool "Command line partition table parsing"
104 depends on MTD_PARTITIONS = "y" && MTD = "y"
106 Allow generic configuration of the MTD partition tables via the kernel
107 command line. Multiple flash resources are supported for hardware where
108 different kinds of flash memory are available.
110 You will still need the parsing functions to be called by the driver
111 for your particular device. It won't happen automatically. The
112 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
115 The format for the command line is as follows:
117 mtdparts=<mtddef>[;<mtddef]
118 <mtddef> := <mtd-id>:<partdef>[,<partdef>]
119 <partdef> := <size>[@offset][<name>][ro]
120 <mtd-id> := unique id used in mapping driver/device
121 <size> := standard linux memsize OR "-" to denote all
125 Due to the way Linux handles the command line, no spaces are
126 allowed in the partition definition, including mtd id's and partition
131 1 flash resource (mtd-id "sa1100"), with 1 single writable partition:
134 Same flash, but 2 named partitions, the first one being read-only:
135 mtdparts=sa1100:256k(ARMboot)ro,-(root)
140 tristate "ARM Firmware Suite partition parsing"
141 depends on ARM && MTD_PARTITIONS
143 The ARM Firmware Suite allows the user to divide flash devices into
144 multiple 'images'. Each such image has a header containing its name
147 If you need code which can detect and parse these tables, and
148 register MTD 'partitions' corresponding to each image detected,
151 You will still need the parsing functions to be called by the driver
152 for your particular device. It won't happen automatically. The
153 'armflash' map driver (CONFIG_MTD_ARMFLASH) does this, for example.
155 comment "User Modules And Translation Layers"
159 tristate "Direct char device access to MTD devices"
162 This provides a character device for each MTD device present in
163 the system, allowing the user to read and write directly to the
164 memory chips, and also use ioctl() to obtain information about
165 the device, or to erase parts of it.
168 tristate "Common interface to block layer for MTD 'translation layers'"
169 depends on MTD && BLOCK
173 tristate "Caching block device access to MTD devices"
174 depends on MTD && BLOCK
177 Although most flash chips have an erase size too large to be useful
178 as block devices, it is possible to use MTD devices which are based
179 on RAM chips in this manner. This block device is a user of MTD
180 devices performing that function.
182 At the moment, it is also required for the Journalling Flash File
183 System(s) to obtain a handle on the MTD device when it's mounted
184 (although JFFS and JFFS2 don't actually use any of the functionality
185 of the mtdblock device).
187 Later, it may be extended to perform read/erase/modify/write cycles
188 on flash chips to emulate a smaller block size. Needless to say,
189 this is very unsafe, but could be useful for file systems which are
190 almost never written to.
192 You do not need this option for use with the DiskOnChip devices. For
193 those, enable NFTL support (CONFIG_NFTL) instead.
196 tristate "Readonly block device access to MTD devices"
197 depends on MTD_BLOCK!=y && MTD && BLOCK
200 This allows you to mount read-only file systems (such as cramfs)
201 from an MTD device, without the overhead (and danger) of the caching
204 You do not need this option for use with the DiskOnChip devices. For
205 those, enable NFTL support (CONFIG_NFTL) instead.
208 tristate "FTL (Flash Translation Layer) support"
209 depends on MTD && BLOCK
212 This provides support for the original Flash Translation Layer which
213 is part of the PCMCIA specification. It uses a kind of pseudo-
214 file system on a flash device to emulate a block device with
215 512-byte sectors, on top of which you put a 'normal' file system.
217 You may find that the algorithms used in this code are patented
218 unless you live in the Free World where software patents aren't
219 legal - in the USA you are only permitted to use this on PCMCIA
220 hardware, although under the terms of the GPL you're obviously
221 permitted to copy, modify and distribute the code as you wish. Just
225 tristate "NFTL (NAND Flash Translation Layer) support"
226 depends on MTD && BLOCK
229 This provides support for the NAND Flash Translation Layer which is
230 used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
231 file system on a flash device to emulate a block device with
232 512-byte sectors, on top of which you put a 'normal' file system.
234 You may find that the algorithms used in this code are patented
235 unless you live in the Free World where software patents aren't
236 legal - in the USA you are only permitted to use this on DiskOnChip
237 hardware, although under the terms of the GPL you're obviously
238 permitted to copy, modify and distribute the code as you wish. Just
242 bool "Write support for NFTL"
245 Support for writing to the NAND Flash Translation Layer, as used
249 tristate "INFTL (Inverse NAND Flash Translation Layer) support"
250 depends on MTD && BLOCK
253 This provides support for the Inverse NAND Flash Translation
254 Layer which is used on M-Systems' newer DiskOnChip devices. It
255 uses a kind of pseudo-file system on a flash device to emulate
256 a block device with 512-byte sectors, on top of which you put
257 a 'normal' file system.
259 You may find that the algorithms used in this code are patented
260 unless you live in the Free World where software patents aren't
261 legal - in the USA you are only permitted to use this on DiskOnChip
262 hardware, although under the terms of the GPL you're obviously
263 permitted to copy, modify and distribute the code as you wish. Just
267 tristate "Resident Flash Disk (Flash Translation Layer) support"
268 depends on MTD && BLOCK
271 This provides support for the flash translation layer known
272 as the Resident Flash Disk (RFD), as used by the Embedded BIOS
273 of General Software. There is a blurb at:
275 http://www.gensw.com/pages/prod/bios/rfd.htm
278 tristate "NAND SSFDC (SmartMedia) read only translation layer"
279 depends on MTD && BLOCK
282 This enables read only access to SmartMedia formatted NAND
283 flash. You can mount it with FAT file system.
285 source "drivers/mtd/chips/Kconfig"
287 source "drivers/mtd/maps/Kconfig"
289 source "drivers/mtd/devices/Kconfig"
291 source "drivers/mtd/nand/Kconfig"
293 source "drivers/mtd/onenand/Kconfig"