1menuconfig MTD 2 tristate "Memory Technology Device (MTD) support" 3 depends on GENERIC_IO 4 help 5 Memory Technology Devices are flash, RAM and similar chips, often 6 used for solid state file systems on embedded devices. This option 7 will provide the generic support for MTD drivers to register 8 themselves with the kernel and for potential users of MTD devices 9 to enumerate the devices which are present and obtain a handle on 10 them. It will also allow you to select individual drivers for 11 particular hardware and users of MTD devices. If unsure, say N. 12 13if MTD 14 15config MTD_TESTS 16 tristate "MTD tests support (DANGEROUS)" 17 depends on m 18 help 19 This option includes various MTD tests into compilation. The tests 20 should normally be compiled as kernel modules. The modules perform 21 various checks and verifications when loaded. 22 23 WARNING: some of the tests will ERASE entire MTD device which they 24 test. Do not use these tests unless you really know what you do. 25 26config MTD_REDBOOT_PARTS 27 tristate "RedBoot partition table parsing" 28 ---help--- 29 RedBoot is a ROM monitor and bootloader which deals with multiple 30 'images' in flash devices by putting a table one of the erase 31 blocks on the device, similar to a partition table, which gives 32 the offsets, lengths and names of all the images stored in the 33 flash. 34 35 If you need code which can detect and parse this table, and register 36 MTD 'partitions' corresponding to each image in the table, enable 37 this option. 38 39 You will still need the parsing functions to be called by the driver 40 for your particular device. It won't happen automatically. The 41 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for 42 example. 43 44if MTD_REDBOOT_PARTS 45 46config MTD_REDBOOT_DIRECTORY_BLOCK 47 int "Location of RedBoot partition table" 48 default "-1" 49 ---help--- 50 This option is the Linux counterpart to the 51 CYGNUM_REDBOOT_FIS_DIRECTORY_BLOCK RedBoot compile time 52 option. 53 54 The option specifies which Flash sectors holds the RedBoot 55 partition table. A zero or positive value gives an absolute 56 erase block number. A negative value specifies a number of 57 sectors before the end of the device. 58 59 For example "2" means block number 2, "-1" means the last 60 block and "-2" means the penultimate block. 61 62config MTD_REDBOOT_PARTS_UNALLOCATED 63 bool "Include unallocated flash regions" 64 help 65 If you need to register each unallocated flash region as a MTD 66 'partition', enable this option. 67 68config MTD_REDBOOT_PARTS_READONLY 69 bool "Force read-only for RedBoot system images" 70 help 71 If you need to force read-only for 'RedBoot', 'RedBoot Config' and 72 'FIS directory' images, enable this option. 73 74endif # MTD_REDBOOT_PARTS 75 76config MTD_CMDLINE_PARTS 77 tristate "Command line partition table parsing" 78 depends on MTD 79 ---help--- 80 Allow generic configuration of the MTD partition tables via the kernel 81 command line. Multiple flash resources are supported for hardware where 82 different kinds of flash memory are available. 83 84 You will still need the parsing functions to be called by the driver 85 for your particular device. It won't happen automatically. The 86 SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for 87 example. 88 89 The format for the command line is as follows: 90 91 mtdparts=<mtddef>[;<mtddef] 92 <mtddef> := <mtd-id>:<partdef>[,<partdef>] 93 <partdef> := <size>[@offset][<name>][ro] 94 <mtd-id> := unique id used in mapping driver/device 95 <size> := standard linux memsize OR "-" to denote all 96 remaining space 97 <name> := (NAME) 98 99 Due to the way Linux handles the command line, no spaces are 100 allowed in the partition definition, including mtd id's and partition 101 names. 102 103 Examples: 104 105 1 flash resource (mtd-id "sa1100"), with 1 single writable partition: 106 mtdparts=sa1100:- 107 108 Same flash, but 2 named partitions, the first one being read-only: 109 mtdparts=sa1100:256k(ARMboot)ro,-(root) 110 111 If unsure, say 'N'. 112 113config MTD_AFS_PARTS 114 tristate "ARM Firmware Suite partition parsing" 115 depends on (ARM || ARM64) 116 ---help--- 117 The ARM Firmware Suite allows the user to divide flash devices into 118 multiple 'images'. Each such image has a header containing its name 119 and offset/size etc. 120 121 If you need code which can detect and parse these tables, and 122 register MTD 'partitions' corresponding to each image detected, 123 enable this option. 124 125 You will still need the parsing functions to be called by the driver 126 for your particular device. It won't happen automatically. The 127 'physmap' map driver (CONFIG_MTD_PHYSMAP) does this, for example. 128 129config MTD_OF_PARTS 130 tristate "OpenFirmware partitioning information support" 131 default y 132 depends on OF 133 help 134 This provides a partition parsing function which derives 135 the partition map from the children of the flash node, 136 as described in Documentation/devicetree/bindings/mtd/partition.txt. 137 138config MTD_AR7_PARTS 139 tristate "TI AR7 partitioning support" 140 ---help--- 141 TI AR7 partitioning support 142 143config MTD_BCM63XX_PARTS 144 tristate "BCM63XX CFE partitioning support" 145 depends on BCM63XX 146 select CRC32 147 help 148 This provides partions parsing for BCM63xx devices with CFE 149 bootloaders. 150 151config MTD_BCM47XX_PARTS 152 tristate "BCM47XX partitioning support" 153 depends on BCM47XX || ARCH_BCM_5301X 154 help 155 This provides partitions parser for devices based on BCM47xx 156 boards. 157 158comment "User Modules And Translation Layers" 159 160# 161# MTD block device support is select'ed if needed 162# 163config MTD_BLKDEVS 164 tristate 165 166config MTD_BLOCK 167 tristate "Caching block device access to MTD devices" 168 depends on BLOCK 169 select MTD_BLKDEVS 170 ---help--- 171 Although most flash chips have an erase size too large to be useful 172 as block devices, it is possible to use MTD devices which are based 173 on RAM chips in this manner. This block device is a user of MTD 174 devices performing that function. 175 176 At the moment, it is also required for the Journalling Flash File 177 System(s) to obtain a handle on the MTD device when it's mounted 178 (although JFFS and JFFS2 don't actually use any of the functionality 179 of the mtdblock device). 180 181 Later, it may be extended to perform read/erase/modify/write cycles 182 on flash chips to emulate a smaller block size. Needless to say, 183 this is very unsafe, but could be useful for file systems which are 184 almost never written to. 185 186 You do not need this option for use with the DiskOnChip devices. For 187 those, enable NFTL support (CONFIG_NFTL) instead. 188 189config MTD_BLOCK_RO 190 tristate "Readonly block device access to MTD devices" 191 depends on MTD_BLOCK!=y && BLOCK 192 select MTD_BLKDEVS 193 help 194 This allows you to mount read-only file systems (such as cramfs) 195 from an MTD device, without the overhead (and danger) of the caching 196 driver. 197 198 You do not need this option for use with the DiskOnChip devices. For 199 those, enable NFTL support (CONFIG_NFTL) instead. 200 201config FTL 202 tristate "FTL (Flash Translation Layer) support" 203 depends on BLOCK 204 select MTD_BLKDEVS 205 ---help--- 206 This provides support for the original Flash Translation Layer which 207 is part of the PCMCIA specification. It uses a kind of pseudo- 208 file system on a flash device to emulate a block device with 209 512-byte sectors, on top of which you put a 'normal' file system. 210 211 You may find that the algorithms used in this code are patented 212 unless you live in the Free World where software patents aren't 213 legal - in the USA you are only permitted to use this on PCMCIA 214 hardware, although under the terms of the GPL you're obviously 215 permitted to copy, modify and distribute the code as you wish. Just 216 not use it. 217 218config NFTL 219 tristate "NFTL (NAND Flash Translation Layer) support" 220 depends on BLOCK 221 select MTD_BLKDEVS 222 ---help--- 223 This provides support for the NAND Flash Translation Layer which is 224 used on M-Systems' DiskOnChip devices. It uses a kind of pseudo- 225 file system on a flash device to emulate a block device with 226 512-byte sectors, on top of which you put a 'normal' file system. 227 228 You may find that the algorithms used in this code are patented 229 unless you live in the Free World where software patents aren't 230 legal - in the USA you are only permitted to use this on DiskOnChip 231 hardware, although under the terms of the GPL you're obviously 232 permitted to copy, modify and distribute the code as you wish. Just 233 not use it. 234 235config NFTL_RW 236 bool "Write support for NFTL" 237 depends on NFTL 238 help 239 Support for writing to the NAND Flash Translation Layer, as used 240 on the DiskOnChip. 241 242config INFTL 243 tristate "INFTL (Inverse NAND Flash Translation Layer) support" 244 depends on BLOCK 245 select MTD_BLKDEVS 246 ---help--- 247 This provides support for the Inverse NAND Flash Translation 248 Layer which is used on M-Systems' newer DiskOnChip devices. It 249 uses a kind of pseudo-file system on a flash device to emulate 250 a block device with 512-byte sectors, on top of which you put 251 a 'normal' file system. 252 253 You may find that the algorithms used in this code are patented 254 unless you live in the Free World where software patents aren't 255 legal - in the USA you are only permitted to use this on DiskOnChip 256 hardware, although under the terms of the GPL you're obviously 257 permitted to copy, modify and distribute the code as you wish. Just 258 not use it. 259 260config RFD_FTL 261 tristate "Resident Flash Disk (Flash Translation Layer) support" 262 depends on BLOCK 263 select MTD_BLKDEVS 264 ---help--- 265 This provides support for the flash translation layer known 266 as the Resident Flash Disk (RFD), as used by the Embedded BIOS 267 of General Software. There is a blurb at: 268 269 http://www.gensw.com/pages/prod/bios/rfd.htm 270 271config SSFDC 272 tristate "NAND SSFDC (SmartMedia) read only translation layer" 273 depends on BLOCK 274 select MTD_BLKDEVS 275 help 276 This enables read only access to SmartMedia formatted NAND 277 flash. You can mount it with FAT file system. 278 279 280config SM_FTL 281 tristate "SmartMedia/xD new translation layer" 282 depends on BLOCK 283 select MTD_BLKDEVS 284 select MTD_NAND_ECC 285 help 286 This enables EXPERIMENTAL R/W support for SmartMedia/xD 287 FTL (Flash translation layer). 288 Write support is only lightly tested, therefore this driver 289 isn't recommended to use with valuable data (anyway if you have 290 valuable data, do backups regardless of software/hardware you 291 use, because you never know what will eat your data...) 292 If you only need R/O access, you can use older R/O driver 293 (CONFIG_SSFDC) 294 295config MTD_OOPS 296 tristate "Log panic/oops to an MTD buffer" 297 help 298 This enables panic and oops messages to be logged to a circular 299 buffer in a flash partition where it can be read back at some 300 later point. 301 302config MTD_SWAP 303 tristate "Swap on MTD device support" 304 depends on MTD && SWAP 305 select MTD_BLKDEVS 306 help 307 Provides volatile block device driver on top of mtd partition 308 suitable for swapping. The mapping of written blocks is not saved. 309 The driver provides wear leveling by storing erase counter into the 310 OOB. 311 312config MTD_PARTITIONED_MASTER 313 bool "Retain master device when partitioned" 314 default n 315 depends on MTD 316 help 317 For historical reasons, by default, either a master is present or 318 several partitions are present, but not both. The concern was that 319 data listed in multiple partitions was dangerous; however, SCSI does 320 this and it is frequently useful for applications. This config option 321 leaves the master in even if the device is partitioned. It also makes 322 the parent of the partition device be the master device, rather than 323 what lies behind the master. 324 325source "drivers/mtd/chips/Kconfig" 326 327source "drivers/mtd/maps/Kconfig" 328 329source "drivers/mtd/devices/Kconfig" 330 331source "drivers/mtd/nand/Kconfig" 332 333source "drivers/mtd/onenand/Kconfig" 334 335source "drivers/mtd/lpddr/Kconfig" 336 337source "drivers/mtd/spi-nor/Kconfig" 338 339source "drivers/mtd/ubi/Kconfig" 340 341endif # MTD 342