drivers/mtd/Kconfig

   1 # $Id: Kconfig,v 1.11 2005/11/07 11:14:19 gleixner Exp $
   2
   3 menuconfig MTD
   4         tristate "Memory Technology Device (MTD) support"
   5         depends on HAS_IOMEM
   6         help
   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.
  14
  15 if MTD
  16
  17 config MTD_DEBUG
  18         bool "Debugging"
  19         help
  20           This turns on low-level debugging for the entire MTD sub-system.
  21           Normally, you should say 'N'.
  22
  23 config MTD_DEBUG_VERBOSE
  24         int "Debugging verbosity (0 = quiet, 3 = noisy)"
  25         depends on MTD_DEBUG
  26         default "0"
  27         help
  28           Determines the verbosity level of the MTD debugging messages.
  29
  30 config MTD_CONCAT
  31         tristate "MTD concatenating support"
  32         help
  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,
  36           say 'Y'.
  37
  38 config MTD_PARTITIONS
  39         bool "MTD partitioning support"
  40         help
  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
  44           unsure, say 'Y'.
  45
  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.
  49
  50 config MTD_REDBOOT_PARTS
  51         tristate "RedBoot partition table parsing"
  52         depends on MTD_PARTITIONS
  53         ---help---
  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
  58           flash.
  59
  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
  62           this option.
  63
  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
  67           example.
  68
  69 config MTD_REDBOOT_DIRECTORY_BLOCK
  70         int "Location of RedBoot partition table"
  71         depends on MTD_REDBOOT_PARTS
  72         default "-1"
  73         ---help---
  74           This option is the Linux counterpart to the
  75           CYGNUM_REDBOOT_FIS_DIRECTORY_BLOCK RedBoot compile time
  76           option.
  77
  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.
  82
  83           For example "2" means block number 2, "-1" means the last
  84           block and "-2" means the penultimate block.
  85
  86 config MTD_REDBOOT_PARTS_UNALLOCATED
  87         bool "Include unallocated flash regions"
  88         depends on MTD_REDBOOT_PARTS
  89         help
  90           If you need to register each unallocated flash region as a MTD
  91           'partition', enable this option.
  92
  93 config MTD_REDBOOT_PARTS_READONLY
  94         bool "Force read-only for RedBoot system images"
  95         depends on MTD_REDBOOT_PARTS
  96         help
  97           If you need to force read-only for 'RedBoot', 'RedBoot Config' and
  98           'FIS directory' images, enable this option.
  99
 100 config MTD_CMDLINE_PARTS
 101         bool "Command line partition table parsing"
 102         depends on MTD_PARTITIONS = "y" && MTD = "y"
 103         ---help---
 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.
 107
 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
 111           example.
 112
 113           The format for the command line is as follows:
 114
 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
 120           remaining space
 121           <name>    := (NAME)
 122
 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
 125           names.
 126
 127           Examples:
 128
 129           1 flash resource (mtd-id "sa1100"), with 1 single writable partition:
 130           mtdparts=sa1100:-
 131
 132           Same flash, but 2 named partitions, the first one being read-only:
 133           mtdparts=sa1100:256k(ARMboot)ro,-(root)
 134
 135           If unsure, say 'N'.
 136
 137 config MTD_AFS_PARTS
 138         tristate "ARM Firmware Suite partition parsing"
 139         depends on ARM && MTD_PARTITIONS
 140         ---help---
 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
 143           and offset/size etc.
 144
 145           If you need code which can detect and parse these tables, and
 146           register MTD 'partitions' corresponding to each image detected,
 147           enable this option.
 148
 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.
 152
 153 comment "User Modules And Translation Layers"
 154
 155 config MTD_CHAR
 156         tristate "Direct char device access to MTD devices"
 157         help
 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.
 162
 163 config MTD_BLKDEVS
 164         tristate "Common interface to block layer for MTD 'translation layers'"
 165         depends on BLOCK
 166         default n
 167
 168 config MTD_BLOCK
 169         tristate "Caching block device access to MTD devices"
 170         depends on BLOCK
 171         select MTD_BLKDEVS
 172         ---help---
 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.
 177
 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).
 182
 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.
 187
 188           You do not need this option for use with the DiskOnChip devices. For
 189           those, enable NFTL support (CONFIG_NFTL) instead.
 190
 191 config MTD_BLOCK_RO
 192         tristate "Readonly block device access to MTD devices"
 193         depends on MTD_BLOCK!=y && BLOCK
 194         select MTD_BLKDEVS
 195         help
 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
 198           driver.
 199
 200           You do not need this option for use with the DiskOnChip devices. For
 201           those, enable NFTL support (CONFIG_NFTL) instead.
 202
 203 config FTL
 204         tristate "FTL (Flash Translation Layer) support"
 205         depends on BLOCK
 206         select MTD_BLKDEVS
 207         ---help---
 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.
 212
 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
 218           not use it.
 219
 220 config NFTL
 221         tristate "NFTL (NAND Flash Translation Layer) support"
 222         depends on BLOCK
 223         select MTD_BLKDEVS
 224         ---help---
 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.
 229
 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
 235           not use it.
 236
 237 config NFTL_RW
 238         bool "Write support for NFTL"
 239         depends on NFTL
 240         help
 241           Support for writing to the NAND Flash Translation Layer, as used
 242           on the DiskOnChip.
 243
 244 config INFTL
 245         tristate "INFTL (Inverse NAND Flash Translation Layer) support"
 246         depends on BLOCK
 247         select MTD_BLKDEVS
 248         ---help---
 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.
 254
 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
 260           not use it.
 261
 262 config RFD_FTL
 263         tristate "Resident Flash Disk (Flash Translation Layer) support"
 264         depends on BLOCK
 265         select MTD_BLKDEVS
 266         ---help---
 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:
 270
 271                 http://www.gensw.com/pages/prod/bios/rfd.htm
 272
 273 config SSFDC
 274         tristate "NAND SSFDC (SmartMedia) read only translation layer"
 275         depends on BLOCK
 276         select MTD_BLKDEVS
 277         help
 278           This enables read only access to SmartMedia formatted NAND
 279           flash. You can mount it with FAT file system.
 280
 281 source "drivers/mtd/chips/Kconfig"
 282
 283 source "drivers/mtd/maps/Kconfig"
 284
 285 source "drivers/mtd/devices/Kconfig"
 286
 287 source "drivers/mtd/nand/Kconfig"
 288
 289 source "drivers/mtd/onenand/Kconfig"
 290
 291 source "drivers/mtd/ubi/Kconfig"
 292
 293 endif # MTD