1 # drivers/mtd/chips/Kconfig
2 # $Id: Kconfig,v 1.18 2005/11/07 11:14:22 gleixner Exp $
4 menu "RAM/ROM/Flash chip drivers"
8 tristate "Detect flash chips by Common Flash Interface (CFI) probe"
12 The Common Flash Interface specification was developed by Intel,
13 AMD and other flash manufactures that provides a universal method
14 for probing the capabilities of flash devices. If you wish to
15 support any device that is CFI-compliant, you need to enable this
16 option. Visit <http://www.amd.com/products/nvd/overview/cfi.html>
17 for more information on CFI.
20 tristate "Detect non-CFI AMD/JEDEC-compatible flash chips"
24 This option enables JEDEC-style probing of flash chips which are not
25 compatible with the Common Flash Interface, but will use the common
26 CFI-targetted flash drivers for any chips which are identified which
27 are in fact compatible in all but the probe method. This actually
28 covers most AMD/Fujitsu-compatible chips and also non-CFI
34 config MTD_CFI_ADV_OPTIONS
35 bool "Flash chip driver advanced configuration options"
36 depends on MTD_GEN_PROBE
38 If you need to specify a specific endianness for access to flash
39 chips, or if you wish to reduce the size of the kernel by including
40 support for only specific arrangements of flash chips, say 'Y'. This
41 option does not directly affect the code, but will enable other
42 configuration options which allow you to do so.
47 prompt "Flash cmd/query data swapping"
48 depends on MTD_CFI_ADV_OPTIONS
49 default MTD_CFI_NOSWAP
54 This option defines the way in which the CPU attempts to arrange
55 data bits when writing the 'magic' commands to the chips. Saying
56 'NO', which is the default when CONFIG_MTD_CFI_ADV_OPTIONS isn't
57 enabled, means that the CPU will not do any swapping; the chips
58 are expected to be wired to the CPU in 'host-endian' form.
59 Specific arrangements are possible with the BIG_ENDIAN_BYTE and
60 LITTLE_ENDIAN_BYTE, if the bytes are reversed.
62 If you have a LART, on which the data (and address) lines were
63 connected in a fashion which ensured that the nets were as short
64 as possible, resulting in a bit-shuffling which seems utterly
65 random to the untrained eye, you need the LART_ENDIAN_BYTE option.
67 Yes, there really exists something sicker than PDP-endian :)
69 config MTD_CFI_BE_BYTE_SWAP
70 bool "BIG_ENDIAN_BYTE"
72 config MTD_CFI_LE_BYTE_SWAP
73 bool "LITTLE_ENDIAN_BYTE"
77 config MTD_CFI_GEOMETRY
78 bool "Specific CFI Flash geometry selection"
79 depends on MTD_CFI_ADV_OPTIONS
81 This option does not affect the code directly, but will enable
82 some other configuration options which would allow you to reduce
83 the size of the kernel by including support for only certain
84 arrangements of CFI chips. If unsure, say 'N' and all options
85 which are supported by the current code will be enabled.
87 config MTD_MAP_BANK_WIDTH_1
88 bool "Support 8-bit buswidth" if MTD_CFI_GEOMETRY
91 If you wish to support CFI devices on a physical bus which is
94 config MTD_MAP_BANK_WIDTH_2
95 bool "Support 16-bit buswidth" if MTD_CFI_GEOMETRY
98 If you wish to support CFI devices on a physical bus which is
99 16 bits wide, say 'Y'.
101 config MTD_MAP_BANK_WIDTH_4
102 bool "Support 32-bit buswidth" if MTD_CFI_GEOMETRY
105 If you wish to support CFI devices on a physical bus which is
106 32 bits wide, say 'Y'.
108 config MTD_MAP_BANK_WIDTH_8
109 bool "Support 64-bit buswidth" if MTD_CFI_GEOMETRY
112 If you wish to support CFI devices on a physical bus which is
113 64 bits wide, say 'Y'.
115 config MTD_MAP_BANK_WIDTH_16
116 bool "Support 128-bit buswidth" if MTD_CFI_GEOMETRY
119 If you wish to support CFI devices on a physical bus which is
120 128 bits wide, say 'Y'.
122 config MTD_MAP_BANK_WIDTH_32
123 bool "Support 256-bit buswidth" if MTD_CFI_GEOMETRY
126 If you wish to support CFI devices on a physical bus which is
127 256 bits wide, say 'Y'.
130 bool "Support 1-chip flash interleave" if MTD_CFI_GEOMETRY
133 If your flash chips are not interleaved - i.e. you only have one
134 flash chip addressed by each bus cycle, then say 'Y'.
137 bool "Support 2-chip flash interleave" if MTD_CFI_GEOMETRY
140 If your flash chips are interleaved in pairs - i.e. you have two
141 flash chips addressed by each bus cycle, then say 'Y'.
144 bool "Support 4-chip flash interleave" if MTD_CFI_GEOMETRY
147 If your flash chips are interleaved in fours - i.e. you have four
148 flash chips addressed by each bus cycle, then say 'Y'.
151 bool "Support 8-chip flash interleave" if MTD_CFI_GEOMETRY
154 If your flash chips are interleaved in eights - i.e. you have eight
155 flash chips addressed by each bus cycle, then say 'Y'.
158 bool "Protection Registers aka one-time programmable (OTP) bits"
159 depends on MTD_CFI_ADV_OPTIONS
162 This enables support for reading, writing and locking so called
163 "Protection Registers" present on some flash chips.
164 A subset of them are pre-programmed at the factory with a
165 unique set of values. The rest is user-programmable.
167 The user-programmable Protection Registers contain one-time
168 programmable (OTP) bits; when programmed, register bits cannot be
169 erased. Each Protection Register can be accessed multiple times to
170 program individual bits, as long as the register remains unlocked.
172 Each Protection Register has an associated Lock Register bit. When a
173 Lock Register bit is programmed, the associated Protection Register
174 can only be read; it can no longer be programmed. Additionally,
175 because the Lock Register bits themselves are OTP, when programmed,
176 Lock Register bits cannot be erased. Therefore, when a Protection
177 Register is locked, it cannot be unlocked.
179 This feature should therefore be used with extreme care. Any mistake
180 in the programming of OTP bits will waste them.
182 config MTD_CFI_INTELEXT
183 tristate "Support for Intel/Sharp flash chips"
184 depends on MTD_GEN_PROBE
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 one of those command sets, used on Intel
190 StrataFlash and other parts.
192 config MTD_CFI_AMDSTD
193 tristate "Support for AMD/Fujitsu flash chips"
194 depends on MTD_GEN_PROBE
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 one of those command sets, used on chips
200 including the AMD Am29LV320.
203 tristate "Support for ST (Advanced Architecture) flash chips"
204 depends on MTD_GEN_PROBE
207 The Common Flash Interface defines a number of different command
208 sets which a CFI-compliant chip may claim to implement. This code
209 provides support for one of those command sets.
215 tristate "Support for RAM chips in bus mapping"
218 This option enables basic support for RAM chips accessed through
219 a bus mapping driver.
222 tristate "Support for ROM chips in bus mapping"
225 This option enables basic support for ROM chips accessed through
226 a bus mapping driver.
229 tristate "Support for absent chips in bus mapping"
232 This option enables support for a dummy probing driver used to
233 allocated placeholder MTD devices on systems that have socketed
234 or removable media. Use of this driver as a fallback chip probe
235 preserves the expected registration order of MTD device nodes on
236 the system regardless of media presence. Device nodes created
237 with this driver will return -ENODEV upon access.
239 config MTD_OBSOLETE_CHIPS
241 bool "Older (theoretically obsoleted now) drivers for non-CFI chips"
243 This option does not enable any code directly, but will allow you to
244 select some other chip drivers which are now considered obsolete,
245 because the generic CONFIG_JEDECPROBE code above should now detect
246 the chips which are supported by these drivers, and allow the generic
247 CFI-compatible drivers to drive the chips. Say 'N' here unless you have
248 already tried the CONFIG_JEDECPROBE method and reported its failure
249 to the MTD mailing list at <linux-mtd@lists.infradead.org>
252 tristate "AMD compatible flash chip support (non-CFI)"
253 depends on MTD && MTD_OBSOLETE_CHIPS && BROKEN
255 This option enables support for flash chips using AMD-compatible
256 commands, including some which are not CFI-compatible and hence
257 cannot be used with the CONFIG_MTD_CFI_AMDSTD option.
259 It also works on AMD compatible chips that do conform to CFI.
262 tristate "pre-CFI Sharp chip support"
263 depends on MTD && MTD_OBSOLETE_CHIPS
265 This option enables support for flash chips using Sharp-compatible
266 commands, including some which are not CFI-compatible and hence
267 cannot be used with the CONFIG_MTD_CFI_INTELxxx options.
270 tristate "JEDEC device support"
271 depends on MTD && MTD_OBSOLETE_CHIPS && BROKEN
273 Enable older older JEDEC flash interface devices for self
274 programming flash. It is commonly used in older AMD chips. It is
275 only called JEDEC because the JEDEC association
276 <http://www.jedec.org/> distributes the identification codes for the
280 bool "XIP aware MTD support"
281 depends on !SMP && (MTD_CFI_INTELEXT || MTD_CFI_AMDSTD) && EXPERIMENTAL && ARCH_MTD_XIP
282 default y if XIP_KERNEL
284 This allows MTD support to work with flash memory which is also
285 used for XIP purposes. If you're not sure what this is all about