1 menu "RAM/ROM/Flash chip drivers"
5 tristate "Detect flash chips by Common Flash Interface (CFI) probe"
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.
17 tristate "Detect non-CFI AMD/JEDEC-compatible flash chips"
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
30 config MTD_CFI_ADV_OPTIONS
31 bool "Flash chip driver advanced configuration options"
32 depends on MTD_GEN_PROBE
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.
43 prompt "Flash cmd/query data swapping"
44 depends on MTD_CFI_ADV_OPTIONS
45 default MTD_CFI_NOSWAP
50 This option defines the way in which the CPU attempts to arrange
51 data bits when writing the 'magic' commands to the chips. Saying
52 'NO', which is the default when CONFIG_MTD_CFI_ADV_OPTIONS isn't
53 enabled, means that the CPU will not do any swapping; the chips
54 are expected to be wired to the CPU in 'host-endian' form.
55 Specific arrangements are possible with the BIG_ENDIAN_BYTE and
56 LITTLE_ENDIAN_BYTE, if the bytes are reversed.
58 If you have a LART, on which the data (and address) lines were
59 connected in a fashion which ensured that the nets were as short
60 as possible, resulting in a bit-shuffling which seems utterly
61 random to the untrained eye, you need the LART_ENDIAN_BYTE option.
63 Yes, there really exists something sicker than PDP-endian :)
65 config MTD_CFI_BE_BYTE_SWAP
66 bool "BIG_ENDIAN_BYTE"
68 config MTD_CFI_LE_BYTE_SWAP
69 bool "LITTLE_ENDIAN_BYTE"
73 config MTD_CFI_GEOMETRY
74 bool "Specific CFI Flash geometry selection"
75 depends on MTD_CFI_ADV_OPTIONS
77 This option does not affect the code directly, but will enable
78 some other configuration options which would allow you to reduce
79 the size of the kernel by including support for only certain
80 arrangements of CFI chips. If unsure, say 'N' and all options
81 which are supported by the current code will be enabled.
83 config MTD_MAP_BANK_WIDTH_1
84 bool "Support 8-bit buswidth" if MTD_CFI_GEOMETRY
87 If you wish to support CFI devices on a physical bus which is
90 config MTD_MAP_BANK_WIDTH_2
91 bool "Support 16-bit buswidth" if MTD_CFI_GEOMETRY
94 If you wish to support CFI devices on a physical bus which is
95 16 bits wide, say 'Y'.
97 config MTD_MAP_BANK_WIDTH_4
98 bool "Support 32-bit buswidth" if MTD_CFI_GEOMETRY
101 If you wish to support CFI devices on a physical bus which is
102 32 bits wide, say 'Y'.
104 config MTD_MAP_BANK_WIDTH_8
105 bool "Support 64-bit buswidth" if MTD_CFI_GEOMETRY
108 If you wish to support CFI devices on a physical bus which is
109 64 bits wide, say 'Y'.
111 config MTD_MAP_BANK_WIDTH_16
112 bool "Support 128-bit buswidth" if MTD_CFI_GEOMETRY
115 If you wish to support CFI devices on a physical bus which is
116 128 bits wide, say 'Y'.
118 config MTD_MAP_BANK_WIDTH_32
119 bool "Support 256-bit buswidth" if MTD_CFI_GEOMETRY
122 If you wish to support CFI devices on a physical bus which is
123 256 bits wide, say 'Y'.
126 bool "Support 1-chip flash interleave" if MTD_CFI_GEOMETRY
129 If your flash chips are not interleaved - i.e. you only have one
130 flash chip addressed by each bus cycle, then say 'Y'.
133 bool "Support 2-chip flash interleave" if MTD_CFI_GEOMETRY
136 If your flash chips are interleaved in pairs - i.e. you have two
137 flash chips addressed by each bus cycle, then say 'Y'.
140 bool "Support 4-chip flash interleave" if MTD_CFI_GEOMETRY
143 If your flash chips are interleaved in fours - i.e. you have four
144 flash chips addressed by each bus cycle, then say 'Y'.
147 bool "Support 8-chip flash interleave" if MTD_CFI_GEOMETRY
150 If your flash chips are interleaved in eights - i.e. you have eight
151 flash chips addressed by each bus cycle, then say 'Y'.
154 bool "Protection Registers aka one-time programmable (OTP) bits"
155 depends on MTD_CFI_ADV_OPTIONS
159 This enables support for reading, writing and locking so called
160 "Protection Registers" present on some flash chips.
161 A subset of them are pre-programmed at the factory with a
162 unique set of values. The rest is user-programmable.
164 The user-programmable Protection Registers contain one-time
165 programmable (OTP) bits; when programmed, register bits cannot be
166 erased. Each Protection Register can be accessed multiple times to
167 program individual bits, as long as the register remains unlocked.
169 Each Protection Register has an associated Lock Register bit. When a
170 Lock Register bit is programmed, the associated Protection Register
171 can only be read; it can no longer be programmed. Additionally,
172 because the Lock Register bits themselves are OTP, when programmed,
173 Lock Register bits cannot be erased. Therefore, when a Protection
174 Register is locked, it cannot be unlocked.
176 This feature should therefore be used with extreme care. Any mistake
177 in the programming of OTP bits will waste them.
179 config MTD_CFI_INTELEXT
180 tristate "Support for Intel/Sharp flash chips"
181 depends on MTD_GEN_PROBE
184 The Common Flash Interface defines a number of different command
185 sets which a CFI-compliant chip may claim to implement. This code
186 provides support for one of those command sets, used on Intel
187 StrataFlash and other parts.
189 config MTD_CFI_AMDSTD
190 tristate "Support for AMD/Fujitsu/Spansion flash chips"
191 depends on MTD_GEN_PROBE
194 The Common Flash Interface defines a number of different command
195 sets which a CFI-compliant chip may claim to implement. This code
196 provides support for one of those command sets, used on chips
197 including the AMD Am29LV320.
200 tristate "Support for ST (Advanced Architecture) flash chips"
201 depends on MTD_GEN_PROBE
204 The Common Flash Interface defines a number of different command
205 sets which a CFI-compliant chip may claim to implement. This code
206 provides support for one of those command sets.
212 tristate "Support for RAM chips in bus mapping"
214 This option enables basic support for RAM chips accessed through
215 a bus mapping driver.
218 tristate "Support for ROM chips in bus mapping"
220 This option enables basic support for ROM chips accessed through
221 a bus mapping driver.
224 tristate "Support for absent chips in bus mapping"
226 This option enables support for a dummy probing driver used to
227 allocated placeholder MTD devices on systems that have socketed
228 or removable media. Use of this driver as a fallback chip probe
229 preserves the expected registration order of MTD device nodes on
230 the system regardless of media presence. Device nodes created
231 with this driver will return -ENODEV upon access.
234 bool "XIP aware MTD support"
235 depends on !SMP && (MTD_CFI_INTELEXT || MTD_CFI_AMDSTD) && EXPERIMENTAL && ARCH_MTD_XIP
236 default y if XIP_KERNEL
238 This allows MTD support to work with flash memory which is also
239 used for XIP purposes. If you're not sure what this is all about