1menu "RAM/ROM/Flash chip drivers" 2 depends on MTD!=n 3 4config MTD_CFI 5 tristate "Detect flash chips by Common Flash Interface (CFI) probe" 6 select MTD_GEN_PROBE 7 select MTD_CFI_UTIL 8 help 9 The Common Flash Interface specification was developed by Intel, 10 AMD and other flash manufactures that provides a universal method 11 for probing the capabilities of flash devices. If you wish to 12 support any device that is CFI-compliant, you need to enable this 13 option. Visit <http://www.amd.com/products/nvd/overview/cfi.html> 14 for more information on CFI. 15 16config MTD_JEDECPROBE 17 tristate "Detect non-CFI AMD/JEDEC-compatible flash chips" 18 select MTD_GEN_PROBE 19 help 20 This option enables JEDEC-style probing of flash chips which are not 21 compatible with the Common Flash Interface, but will use the common 22 CFI-targeted flash drivers for any chips which are identified which 23 are in fact compatible in all but the probe method. This actually 24 covers most AMD/Fujitsu-compatible chips and also non-CFI 25 Intel chips. 26 27config MTD_GEN_PROBE 28 tristate 29 30config MTD_CFI_ADV_OPTIONS 31 bool "Flash chip driver advanced configuration options" 32 depends on MTD_GEN_PROBE 33 help 34 If you need to specify a specific endianness for access to flash 35 chips, or if you wish to reduce the size of the kernel by including 36 support for only specific arrangements of flash chips, say 'Y'. This 37 option does not directly affect the code, but will enable other 38 configuration options which allow you to do so. 39 40 If unsure, say 'N'. 41 42choice 43 prompt "Flash cmd/query data swapping" 44 depends on MTD_CFI_ADV_OPTIONS 45 default MTD_CFI_NOSWAP 46 ---help--- 47 This option defines the way in which the CPU attempts to arrange 48 data bits when writing the 'magic' commands to the chips. Saying 49 'NO', which is the default when CONFIG_MTD_CFI_ADV_OPTIONS isn't 50 enabled, means that the CPU will not do any swapping; the chips 51 are expected to be wired to the CPU in 'host-endian' form. 52 Specific arrangements are possible with the BIG_ENDIAN_BYTE and 53 LITTLE_ENDIAN_BYTE, if the bytes are reversed. 54 55config MTD_CFI_NOSWAP 56 bool "NO" 57 58config MTD_CFI_BE_BYTE_SWAP 59 bool "BIG_ENDIAN_BYTE" 60 61config MTD_CFI_LE_BYTE_SWAP 62 bool "LITTLE_ENDIAN_BYTE" 63 64endchoice 65 66config MTD_CFI_GEOMETRY 67 bool "Specific CFI Flash geometry selection" 68 depends on MTD_CFI_ADV_OPTIONS 69 help 70 This option does not affect the code directly, but will enable 71 some other configuration options which would allow you to reduce 72 the size of the kernel by including support for only certain 73 arrangements of CFI chips. If unsure, say 'N' and all options 74 which are supported by the current code will be enabled. 75 76config MTD_MAP_BANK_WIDTH_1 77 bool "Support 8-bit buswidth" if MTD_CFI_GEOMETRY 78 default y 79 help 80 If you wish to support CFI devices on a physical bus which is 81 8 bits wide, say 'Y'. 82 83config MTD_MAP_BANK_WIDTH_2 84 bool "Support 16-bit buswidth" if MTD_CFI_GEOMETRY 85 default y 86 help 87 If you wish to support CFI devices on a physical bus which is 88 16 bits wide, say 'Y'. 89 90config MTD_MAP_BANK_WIDTH_4 91 bool "Support 32-bit buswidth" if MTD_CFI_GEOMETRY 92 default y 93 help 94 If you wish to support CFI devices on a physical bus which is 95 32 bits wide, say 'Y'. 96 97config MTD_MAP_BANK_WIDTH_8 98 bool "Support 64-bit buswidth" if MTD_CFI_GEOMETRY 99 default n 100 help 101 If you wish to support CFI devices on a physical bus which is 102 64 bits wide, say 'Y'. 103 104config MTD_MAP_BANK_WIDTH_16 105 bool "Support 128-bit buswidth" if MTD_CFI_GEOMETRY 106 default n 107 help 108 If you wish to support CFI devices on a physical bus which is 109 128 bits wide, say 'Y'. 110 111config MTD_MAP_BANK_WIDTH_32 112 bool "Support 256-bit buswidth" if MTD_CFI_GEOMETRY 113 select MTD_COMPLEX_MAPPINGS if HAS_IOMEM 114 default n 115 help 116 If you wish to support CFI devices on a physical bus which is 117 256 bits wide, say 'Y'. 118 119config MTD_CFI_I1 120 bool "Support 1-chip flash interleave" if MTD_CFI_GEOMETRY 121 default y 122 help 123 If your flash chips are not interleaved - i.e. you only have one 124 flash chip addressed by each bus cycle, then say 'Y'. 125 126config MTD_CFI_I2 127 bool "Support 2-chip flash interleave" if MTD_CFI_GEOMETRY 128 default y 129 help 130 If your flash chips are interleaved in pairs - i.e. you have two 131 flash chips addressed by each bus cycle, then say 'Y'. 132 133config MTD_CFI_I4 134 bool "Support 4-chip flash interleave" if MTD_CFI_GEOMETRY 135 default n 136 help 137 If your flash chips are interleaved in fours - i.e. you have four 138 flash chips addressed by each bus cycle, then say 'Y'. 139 140config MTD_CFI_I8 141 bool "Support 8-chip flash interleave" if MTD_CFI_GEOMETRY 142 default n 143 help 144 If your flash chips are interleaved in eights - i.e. you have eight 145 flash chips addressed by each bus cycle, then say 'Y'. 146 147config MTD_OTP 148 bool "Protection Registers aka one-time programmable (OTP) bits" 149 depends on MTD_CFI_ADV_OPTIONS 150 default n 151 help 152 This enables support for reading, writing and locking so called 153 "Protection Registers" present on some flash chips. 154 A subset of them are pre-programmed at the factory with a 155 unique set of values. The rest is user-programmable. 156 157 The user-programmable Protection Registers contain one-time 158 programmable (OTP) bits; when programmed, register bits cannot be 159 erased. Each Protection Register can be accessed multiple times to 160 program individual bits, as long as the register remains unlocked. 161 162 Each Protection Register has an associated Lock Register bit. When a 163 Lock Register bit is programmed, the associated Protection Register 164 can only be read; it can no longer be programmed. Additionally, 165 because the Lock Register bits themselves are OTP, when programmed, 166 Lock Register bits cannot be erased. Therefore, when a Protection 167 Register is locked, it cannot be unlocked. 168 169 This feature should therefore be used with extreme care. Any mistake 170 in the programming of OTP bits will waste them. 171 172config MTD_CFI_INTELEXT 173 tristate "Support for CFI command set 0001 (Intel/Sharp chips)" 174 depends on MTD_GEN_PROBE 175 select MTD_CFI_UTIL 176 help 177 The Common Flash Interface defines a number of different command 178 sets which a CFI-compliant chip may claim to implement. This code 179 provides support for command set 0001, used on Intel StrataFlash 180 and other parts. 181 182config MTD_CFI_AMDSTD 183 tristate "Support for CFI command set 0002 (AMD/Fujitsu/Spansion chips)" 184 depends on MTD_GEN_PROBE 185 select MTD_CFI_UTIL 186 help 187 The Common Flash Interface defines a number of different command 188 sets which a CFI-compliant chip may claim to implement. This code 189 provides support for command set 0002, used on chips including 190 the AMD Am29LV320. 191 192config MTD_CFI_STAA 193 tristate "Support for CFI command set 0020 (ST (Advanced Architecture) chips)" 194 depends on MTD_GEN_PROBE 195 select MTD_CFI_UTIL 196 help 197 The Common Flash Interface defines a number of different command 198 sets which a CFI-compliant chip may claim to implement. This code 199 provides support for command set 0020. 200 201config MTD_CFI_UTIL 202 tristate 203 204config MTD_RAM 205 tristate "Support for RAM chips in bus mapping" 206 help 207 This option enables basic support for RAM chips accessed through 208 a bus mapping driver. 209 210config MTD_ROM 211 tristate "Support for ROM chips in bus mapping" 212 help 213 This option enables basic support for ROM chips accessed through 214 a bus mapping driver. 215 216config MTD_ABSENT 217 tristate "Support for absent chips in bus mapping" 218 help 219 This option enables support for a dummy probing driver used to 220 allocated placeholder MTD devices on systems that have socketed 221 or removable media. Use of this driver as a fallback chip probe 222 preserves the expected registration order of MTD device nodes on 223 the system regardless of media presence. Device nodes created 224 with this driver will return -ENODEV upon access. 225 226config MTD_XIP 227 bool "XIP aware MTD support" 228 depends on !SMP && (MTD_CFI_INTELEXT || MTD_CFI_AMDSTD) && ARCH_MTD_XIP 229 default y if XIP_KERNEL 230 help 231 This allows MTD support to work with flash memory which is also 232 used for XIP purposes. If you're not sure what this is all about 233 then say N. 234 235endmenu 236