1menuconfig MTD 2 tristate "Memory Technology Device (MTD) support" 3 imply NVMEM 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 26menu "Partition parsers" 27source "drivers/mtd/parsers/Kconfig" 28endmenu 29 30comment "User Modules And Translation Layers" 31 32# 33# MTD block device support is select'ed if needed 34# 35config MTD_BLKDEVS 36 tristate 37 38config MTD_BLOCK 39 tristate "Caching block device access to MTD devices" 40 depends on BLOCK 41 select MTD_BLKDEVS 42 help 43 Although most flash chips have an erase size too large to be useful 44 as block devices, it is possible to use MTD devices which are based 45 on RAM chips in this manner. This block device is a user of MTD 46 devices performing that function. 47 48 At the moment, it is also required for the Journalling Flash File 49 System(s) to obtain a handle on the MTD device when it's mounted 50 (although JFFS and JFFS2 don't actually use any of the functionality 51 of the mtdblock device). 52 53 Later, it may be extended to perform read/erase/modify/write cycles 54 on flash chips to emulate a smaller block size. Needless to say, 55 this is very unsafe, but could be useful for file systems which are 56 almost never written to. 57 58 You do not need this option for use with the DiskOnChip devices. For 59 those, enable NFTL support (CONFIG_NFTL) instead. 60 61config MTD_BLOCK_RO 62 tristate "Readonly block device access to MTD devices" 63 depends on MTD_BLOCK!=y && BLOCK 64 select MTD_BLKDEVS 65 help 66 This allows you to mount read-only file systems (such as cramfs) 67 from an MTD device, without the overhead (and danger) of the caching 68 driver. 69 70 You do not need this option for use with the DiskOnChip devices. For 71 those, enable NFTL support (CONFIG_NFTL) instead. 72 73config FTL 74 tristate "FTL (Flash Translation Layer) support" 75 depends on BLOCK 76 select MTD_BLKDEVS 77 help 78 This provides support for the original Flash Translation Layer which 79 is part of the PCMCIA specification. It uses a kind of pseudo- 80 file system on a flash device to emulate a block device with 81 512-byte sectors, on top of which you put a 'normal' file system. 82 83 You may find that the algorithms used in this code are patented 84 unless you live in the Free World where software patents aren't 85 legal - in the USA you are only permitted to use this on PCMCIA 86 hardware, although under the terms of the GPL you're obviously 87 permitted to copy, modify and distribute the code as you wish. Just 88 not use it. 89 90config NFTL 91 tristate "NFTL (NAND Flash Translation Layer) support" 92 depends on BLOCK 93 select MTD_BLKDEVS 94 help 95 This provides support for the NAND Flash Translation Layer which is 96 used on M-Systems' DiskOnChip devices. It uses a kind of pseudo- 97 file system on a flash device to emulate a block device with 98 512-byte sectors, on top of which you put a 'normal' file system. 99 100 You may find that the algorithms used in this code are patented 101 unless you live in the Free World where software patents aren't 102 legal - in the USA you are only permitted to use this on DiskOnChip 103 hardware, although under the terms of the GPL you're obviously 104 permitted to copy, modify and distribute the code as you wish. Just 105 not use it. 106 107config NFTL_RW 108 bool "Write support for NFTL" 109 depends on NFTL 110 help 111 Support for writing to the NAND Flash Translation Layer, as used 112 on the DiskOnChip. 113 114config INFTL 115 tristate "INFTL (Inverse NAND Flash Translation Layer) support" 116 depends on BLOCK 117 select MTD_BLKDEVS 118 help 119 This provides support for the Inverse NAND Flash Translation 120 Layer which is used on M-Systems' newer DiskOnChip devices. It 121 uses a kind of pseudo-file system on a flash device to emulate 122 a block device with 512-byte sectors, on top of which you put 123 a 'normal' file system. 124 125 You may find that the algorithms used in this code are patented 126 unless you live in the Free World where software patents aren't 127 legal - in the USA you are only permitted to use this on DiskOnChip 128 hardware, although under the terms of the GPL you're obviously 129 permitted to copy, modify and distribute the code as you wish. Just 130 not use it. 131 132config RFD_FTL 133 tristate "Resident Flash Disk (Flash Translation Layer) support" 134 depends on BLOCK 135 select MTD_BLKDEVS 136 help 137 This provides support for the flash translation layer known 138 as the Resident Flash Disk (RFD), as used by the Embedded BIOS 139 of General Software. There is a blurb at: 140 141 http://www.gensw.com/pages/prod/bios/rfd.htm 142 143config SSFDC 144 tristate "NAND SSFDC (SmartMedia) read only translation layer" 145 depends on BLOCK 146 select MTD_BLKDEVS 147 help 148 This enables read only access to SmartMedia formatted NAND 149 flash. You can mount it with FAT file system. 150 151config SM_FTL 152 tristate "SmartMedia/xD new translation layer" 153 depends on BLOCK 154 select MTD_BLKDEVS 155 select MTD_NAND_ECC_SW_HAMMING 156 help 157 This enables EXPERIMENTAL R/W support for SmartMedia/xD 158 FTL (Flash translation layer). 159 Write support is only lightly tested, therefore this driver 160 isn't recommended to use with valuable data (anyway if you have 161 valuable data, do backups regardless of software/hardware you 162 use, because you never know what will eat your data...) 163 If you only need R/O access, you can use older R/O driver 164 (CONFIG_SSFDC) 165 166config MTD_OOPS 167 tristate "Log panic/oops to an MTD buffer" 168 help 169 This enables panic and oops messages to be logged to a circular 170 buffer in a flash partition where it can be read back at some 171 later point. 172 173config MTD_SWAP 174 tristate "Swap on MTD device support" 175 depends on MTD && SWAP 176 select MTD_BLKDEVS 177 help 178 Provides volatile block device driver on top of mtd partition 179 suitable for swapping. The mapping of written blocks is not saved. 180 The driver provides wear leveling by storing erase counter into the 181 OOB. 182 183config MTD_PARTITIONED_MASTER 184 bool "Retain master device when partitioned" 185 default n 186 depends on MTD 187 help 188 For historical reasons, by default, either a master is present or 189 several partitions are present, but not both. The concern was that 190 data listed in multiple partitions was dangerous; however, SCSI does 191 this and it is frequently useful for applications. This config option 192 leaves the master in even if the device is partitioned. It also makes 193 the parent of the partition device be the master device, rather than 194 what lies behind the master. 195 196source "drivers/mtd/chips/Kconfig" 197 198source "drivers/mtd/maps/Kconfig" 199 200source "drivers/mtd/devices/Kconfig" 201 202source "drivers/mtd/nand/Kconfig" 203 204source "drivers/mtd/lpddr/Kconfig" 205 206source "drivers/mtd/spi-nor/Kconfig" 207 208source "drivers/mtd/ubi/Kconfig" 209 210source "drivers/mtd/hyperbus/Kconfig" 211 212endif # MTD 213