1 # $Id: Kconfig,v 1.6 2004/08/09 13:19:42 dwmw2 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 bool "MTD partitioning support"
34 If you have a device which needs to divide its flash chip(s) up
35 into multiple 'partitions', each of which appears to the user as
36 a separate MTD device, you require this option to be enabled. If
39 Note, however, that you don't need this option for the DiskOnChip
40 devices. Partitioning on NFTL 'devices' is a different - that's the
41 'normal' form of partitioning used on a block device.
44 tristate "MTD concatenating support"
47 Support for concatenating several MTD devices into a single
48 (virtual) one. This allows you to have -for example- a JFFS(2)
49 file system spanning multiple physical flash chips. If unsure,
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 in the last erase
58 block of 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_PARTS_UNALLOCATED
72 bool " Include unallocated flash regions"
73 depends on MTD_REDBOOT_PARTS
75 If you need to register each unallocated flash region as a MTD
76 'partition', enable this option.
78 config MTD_REDBOOT_PARTS_READONLY
79 bool " Force read-only for RedBoot system images"
80 depends on MTD_REDBOOT_PARTS
82 If you need to force read-only for 'RedBoot', 'RedBoot Config' and
83 'FIS directory' images, enable this option.
85 config MTD_CMDLINE_PARTS
86 bool "Command line partition table parsing"
87 depends on MTD_PARTITIONS = "y"
89 Allow generic configuration of the MTD paritition tables via the kernel
90 command line. Multiple flash resources are supported for hardware where
91 different kinds of flash memory are available.
93 You will still need the parsing functions to be called by the driver
94 for your particular device. It won't happen automatically. The
95 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
98 The format for the command line is as follows:
100 mtdparts=<mtddef>[;<mtddef]
101 <mtddef> := <mtd-id>:<partdef>[,<partdef>]
102 <partdef> := <size>[@offset][<name>][ro]
103 <mtd-id> := unique id used in mapping driver/device
104 <size> := standard linux memsize OR "-" to denote all
108 Due to the way Linux handles the command line, no spaces are
109 allowed in the partition definition, including mtd id's and partition
114 1 flash resource (mtd-id "sa1100"), with 1 single writable partition:
117 Same flash, but 2 named partitions, the first one being read-only:
118 mtdparts=sa1100:256k(ARMboot)ro,-(root)
123 tristate "ARM Firmware Suite partition parsing"
124 depends on ARM && MTD_PARTITIONS
126 The ARM Firmware Suite allows the user to divide flash devices into
127 multiple 'images'. Each such image has a header containing its name
130 If you need code which can detect and parse these tables, and
131 register MTD 'partitions' corresponding to each image detected,
134 You will still need the parsing functions to be called by the driver
135 for your particular device. It won't happen automatically. The
136 'armflash' map driver (CONFIG_MTD_ARMFLASH) does this, for example.
138 comment "User Modules And Translation Layers"
142 tristate "Direct char device access to MTD devices"
145 This provides a character device for each MTD device present in
146 the system, allowing the user to read and write directly to the
147 memory chips, and also use ioctl() to obtain information about
148 the device, or to erase parts of it.
151 tristate "Caching block device access to MTD devices"
154 Although most flash chips have an erase size too large to be useful
155 as block devices, it is possible to use MTD devices which are based
156 on RAM chips in this manner. This block device is a user of MTD
157 devices performing that function.
159 At the moment, it is also required for the Journalling Flash File
160 System(s) to obtain a handle on the MTD device when it's mounted
161 (although JFFS and JFFS2 don't actually use any of the functionality
162 of the mtdblock device).
164 Later, it may be extended to perform read/erase/modify/write cycles
165 on flash chips to emulate a smaller block size. Needless to say,
166 this is very unsafe, but could be useful for file systems which are
167 almost never written to.
169 You do not need this option for use with the DiskOnChip devices. For
170 those, enable NFTL support (CONFIG_NFTL) instead.
173 tristate "Readonly block device access to MTD devices"
174 depends on MTD_BLOCK!=y && MTD
176 This allows you to mount read-only file systems (such as cramfs)
177 from an MTD device, without the overhead (and danger) of the caching
180 You do not need this option for use with the DiskOnChip devices. For
181 those, enable NFTL support (CONFIG_NFTL) instead.
184 tristate "FTL (Flash Translation Layer) support"
187 This provides support for the original Flash Translation Layer which
188 is part of the PCMCIA specification. It uses a kind of pseudo-
189 file system on a flash device to emulate a block device with
190 512-byte sectors, on top of which you put a 'normal' file system.
192 You may find that the algorithms used in this code are patented
193 unless you live in the Free World where software patents aren't
194 legal - in the USA you are only permitted to use this on PCMCIA
195 hardware, although under the terms of the GPL you're obviously
196 permitted to copy, modify and distribute the code as you wish. Just
200 tristate "NFTL (NAND Flash Translation Layer) support"
203 This provides support for the NAND Flash Translation Layer which is
204 used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
205 file system on a flash device to emulate a block device with
206 512-byte sectors, on top of which you put a 'normal' file system.
208 You may find that the algorithms used in this code are patented
209 unless you live in the Free World where software patents aren't
210 legal - in the USA you are only permitted to use this on DiskOnChip
211 hardware, although under the terms of the GPL you're obviously
212 permitted to copy, modify and distribute the code as you wish. Just
216 bool "Write support for NFTL"
219 Support for writing to the NAND Flash Translation Layer, as used
223 tristate "INFTL (Inverse NAND Flash Translation Layer) support"
226 This provides support for the Inverse NAND Flash Translation
227 Layer which is used on M-Systems' newer DiskOnChip devices. It
228 uses a kind of pseudo-file system on a flash device to emulate
229 a block device with 512-byte sectors, on top of which you put
230 a 'normal' file system.
232 You may find that the algorithms used in this code are patented
233 unless you live in the Free World where software patents aren't
234 legal - in the USA you are only permitted to use this on DiskOnChip
235 hardware, although under the terms of the GPL you're obviously
236 permitted to copy, modify and distribute the code as you wish. Just
239 source "drivers/mtd/chips/Kconfig"
241 source "drivers/mtd/maps/Kconfig"
243 source "drivers/mtd/devices/Kconfig"
245 source "drivers/mtd/nand/Kconfig"