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fddcca5107
When map_word gets too large, we use a lot of kernel stack, and for
MTD_MAP_BANK_WIDTH_32, this means we use more than the recommended
1024 bytes in a number of functions:
drivers/mtd/chips/cfi_cmdset_0020.c: In function 'cfi_staa_write_buffers':
drivers/mtd/chips/cfi_cmdset_0020.c:651:1: warning: the frame size of 1336 bytes is larger than 1024 bytes [-Wframe-larger-than=]
drivers/mtd/chips/cfi_cmdset_0020.c: In function 'cfi_staa_erase_varsize':
drivers/mtd/chips/cfi_cmdset_0020.c:972:1: warning: the frame size of 1208 bytes is larger than 1024 bytes [-Wframe-larger-than=]
drivers/mtd/chips/cfi_cmdset_0001.c: In function 'do_write_buffer':
drivers/mtd/chips/cfi_cmdset_0001.c:1835:1: warning: the frame size of 1240 bytes is larger than 1024 bytes [-Wframe-larger-than=]
This can be avoided if all operations on the map word are done
indirectly and the stack gets reused between the calls. We can
mostly achieve this by selecting MTD_COMPLEX_MAPPINGS whenever
MTD_MAP_BANK_WIDTH_32 is set, but for the case that no other
bank width is enabled, we also need to use a non-constant
map_bankwidth() to convince the compiler to use less stack.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
[Brian: this patch mostly achieves its goal by forcing
MTD_COMPLEX_MAPPINGS (and the accompanying indirection) for 256-bit
mappings; the rest of the change is mostly a wash, though it helps
reduce stack size slightly. If we really care about supporting
256-bit mappings though, we should consider rewriting some of this
code to avoid keeping and assigning so many 256-bit objects on the
stack.]
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
241 lines
8.2 KiB
Plaintext
241 lines
8.2 KiB
Plaintext
menu "RAM/ROM/Flash chip drivers"
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depends on MTD!=n
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config MTD_CFI
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tristate "Detect flash chips by Common Flash Interface (CFI) probe"
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select MTD_GEN_PROBE
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select MTD_CFI_UTIL
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help
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The Common Flash Interface specification was developed by Intel,
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AMD and other flash manufactures that provides a universal method
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for probing the capabilities of flash devices. If you wish to
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support any device that is CFI-compliant, you need to enable this
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option. Visit <http://www.amd.com/products/nvd/overview/cfi.html>
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for more information on CFI.
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config MTD_JEDECPROBE
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tristate "Detect non-CFI AMD/JEDEC-compatible flash chips"
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select MTD_GEN_PROBE
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select MTD_CFI_UTIL
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help
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This option enables JEDEC-style probing of flash chips which are not
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compatible with the Common Flash Interface, but will use the common
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CFI-targeted flash drivers for any chips which are identified which
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are in fact compatible in all but the probe method. This actually
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covers most AMD/Fujitsu-compatible chips and also non-CFI
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Intel chips.
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config MTD_GEN_PROBE
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tristate
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config MTD_CFI_ADV_OPTIONS
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bool "Flash chip driver advanced configuration options"
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depends on MTD_GEN_PROBE
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help
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If you need to specify a specific endianness for access to flash
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chips, or if you wish to reduce the size of the kernel by including
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support for only specific arrangements of flash chips, say 'Y'. This
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option does not directly affect the code, but will enable other
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configuration options which allow you to do so.
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If unsure, say 'N'.
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choice
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prompt "Flash cmd/query data swapping"
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depends on MTD_CFI_ADV_OPTIONS
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default MTD_CFI_NOSWAP
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---help---
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This option defines the way in which the CPU attempts to arrange
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data bits when writing the 'magic' commands to the chips. Saying
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'NO', which is the default when CONFIG_MTD_CFI_ADV_OPTIONS isn't
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enabled, means that the CPU will not do any swapping; the chips
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are expected to be wired to the CPU in 'host-endian' form.
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Specific arrangements are possible with the BIG_ENDIAN_BYTE and
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LITTLE_ENDIAN_BYTE, if the bytes are reversed.
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config MTD_CFI_NOSWAP
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bool "NO"
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config MTD_CFI_BE_BYTE_SWAP
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bool "BIG_ENDIAN_BYTE"
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config MTD_CFI_LE_BYTE_SWAP
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bool "LITTLE_ENDIAN_BYTE"
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endchoice
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config MTD_CFI_GEOMETRY
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bool "Specific CFI Flash geometry selection"
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depends on MTD_CFI_ADV_OPTIONS
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select MTD_MAP_BANK_WIDTH_1 if !(MTD_MAP_BANK_WIDTH_2 || \
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MTD_MAP_BANK_WIDTH_4 || MTD_MAP_BANK_WIDTH_8 || \
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MTD_MAP_BANK_WIDTH_16 || MTD_MAP_BANK_WIDTH_32)
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select MTD_CFI_I1 if !(MTD_CFI_I2 || MTD_CFI_I4 || MTD_CFI_I8)
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help
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This option does not affect the code directly, but will enable
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some other configuration options which would allow you to reduce
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the size of the kernel by including support for only certain
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arrangements of CFI chips. If unsure, say 'N' and all options
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which are supported by the current code will be enabled.
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config MTD_MAP_BANK_WIDTH_1
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bool "Support 8-bit buswidth" if MTD_CFI_GEOMETRY
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default y
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help
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If you wish to support CFI devices on a physical bus which is
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8 bits wide, say 'Y'.
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config MTD_MAP_BANK_WIDTH_2
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bool "Support 16-bit buswidth" if MTD_CFI_GEOMETRY
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default y
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help
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If you wish to support CFI devices on a physical bus which is
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16 bits wide, say 'Y'.
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config MTD_MAP_BANK_WIDTH_4
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bool "Support 32-bit buswidth" if MTD_CFI_GEOMETRY
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default y
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help
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If you wish to support CFI devices on a physical bus which is
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32 bits wide, say 'Y'.
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config MTD_MAP_BANK_WIDTH_8
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bool "Support 64-bit buswidth" if MTD_CFI_GEOMETRY
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default n
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help
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If you wish to support CFI devices on a physical bus which is
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64 bits wide, say 'Y'.
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config MTD_MAP_BANK_WIDTH_16
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bool "Support 128-bit buswidth" if MTD_CFI_GEOMETRY
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default n
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help
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If you wish to support CFI devices on a physical bus which is
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128 bits wide, say 'Y'.
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config MTD_MAP_BANK_WIDTH_32
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bool "Support 256-bit buswidth" if MTD_CFI_GEOMETRY
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select MTD_COMPLEX_MAPPINGS if HAS_IOMEM
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default n
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help
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If you wish to support CFI devices on a physical bus which is
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256 bits wide, say 'Y'.
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config MTD_CFI_I1
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bool "Support 1-chip flash interleave" if MTD_CFI_GEOMETRY
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default y
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help
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If your flash chips are not interleaved - i.e. you only have one
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flash chip addressed by each bus cycle, then say 'Y'.
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config MTD_CFI_I2
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bool "Support 2-chip flash interleave" if MTD_CFI_GEOMETRY
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default y
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help
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If your flash chips are interleaved in pairs - i.e. you have two
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flash chips addressed by each bus cycle, then say 'Y'.
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config MTD_CFI_I4
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bool "Support 4-chip flash interleave" if MTD_CFI_GEOMETRY
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default n
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help
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If your flash chips are interleaved in fours - i.e. you have four
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flash chips addressed by each bus cycle, then say 'Y'.
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config MTD_CFI_I8
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bool "Support 8-chip flash interleave" if MTD_CFI_GEOMETRY
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default n
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help
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If your flash chips are interleaved in eights - i.e. you have eight
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flash chips addressed by each bus cycle, then say 'Y'.
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config MTD_OTP
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bool "Protection Registers aka one-time programmable (OTP) bits"
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depends on MTD_CFI_ADV_OPTIONS
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default n
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help
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This enables support for reading, writing and locking so called
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"Protection Registers" present on some flash chips.
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A subset of them are pre-programmed at the factory with a
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unique set of values. The rest is user-programmable.
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The user-programmable Protection Registers contain one-time
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programmable (OTP) bits; when programmed, register bits cannot be
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erased. Each Protection Register can be accessed multiple times to
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program individual bits, as long as the register remains unlocked.
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Each Protection Register has an associated Lock Register bit. When a
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Lock Register bit is programmed, the associated Protection Register
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can only be read; it can no longer be programmed. Additionally,
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because the Lock Register bits themselves are OTP, when programmed,
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Lock Register bits cannot be erased. Therefore, when a Protection
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Register is locked, it cannot be unlocked.
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This feature should therefore be used with extreme care. Any mistake
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in the programming of OTP bits will waste them.
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config MTD_CFI_INTELEXT
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tristate "Support for CFI command set 0001 (Intel/Sharp chips)"
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depends on MTD_GEN_PROBE
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select MTD_CFI_UTIL
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help
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The Common Flash Interface defines a number of different command
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sets which a CFI-compliant chip may claim to implement. This code
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provides support for command set 0001, used on Intel StrataFlash
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and other parts.
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config MTD_CFI_AMDSTD
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tristate "Support for CFI command set 0002 (AMD/Fujitsu/Spansion chips)"
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depends on MTD_GEN_PROBE
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select MTD_CFI_UTIL
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help
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The Common Flash Interface defines a number of different command
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sets which a CFI-compliant chip may claim to implement. This code
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provides support for command set 0002, used on chips including
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the AMD Am29LV320.
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config MTD_CFI_STAA
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tristate "Support for CFI command set 0020 (ST (Advanced Architecture) chips)"
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depends on MTD_GEN_PROBE
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select MTD_CFI_UTIL
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help
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The Common Flash Interface defines a number of different command
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sets which a CFI-compliant chip may claim to implement. This code
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provides support for command set 0020.
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config MTD_CFI_UTIL
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tristate
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config MTD_RAM
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tristate "Support for RAM chips in bus mapping"
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help
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This option enables basic support for RAM chips accessed through
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a bus mapping driver.
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config MTD_ROM
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tristate "Support for ROM chips in bus mapping"
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help
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This option enables basic support for ROM chips accessed through
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a bus mapping driver.
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config MTD_ABSENT
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tristate "Support for absent chips in bus mapping"
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help
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This option enables support for a dummy probing driver used to
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allocated placeholder MTD devices on systems that have socketed
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or removable media. Use of this driver as a fallback chip probe
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preserves the expected registration order of MTD device nodes on
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the system regardless of media presence. Device nodes created
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with this driver will return -ENODEV upon access.
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config MTD_XIP
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bool "XIP aware MTD support"
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depends on !SMP && (MTD_CFI_INTELEXT || MTD_CFI_AMDSTD) && ARCH_MTD_XIP
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default y if XIP_KERNEL
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help
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This allows MTD support to work with flash memory which is also
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used for XIP purposes. If you're not sure what this is all about
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then say N.
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endmenu
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