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Cypress' HyperBus is Low Signal Count, High Performance Double Data Rate Bus interface between a host system master and one or more slave interfaces. HyperBus is used to connect microprocessor, microcontroller, or ASIC devices with random access NOR flash memory (called HyperFlash) or self refresh DRAM (called HyperRAM). Its a 8-bit data bus (DQ[7:0]) with Read-Write Data Strobe (RWDS) signal and either Single-ended clock(3.0V parts) or Differential clock (1.8V parts). It uses ChipSelect lines to select b/w multiple slaves. At bus level, it follows a separate protocol described in HyperBus specification[1]. HyperFlash follows CFI AMD/Fujitsu Extended Command Set (0x0002) similar to that of existing parallel NORs. Since HyperBus is x8 DDR bus, its equivalent to x16 parallel NOR flash with respect to bits per clock cycle. But HyperBus operates at >166MHz frequencies. HyperRAM provides direct random read/write access to flash memory array. But, HyperBus memory controllers seem to abstract implementation details and expose a simple MMIO interface to access connected flash. Add support for registering HyperFlash devices with MTD framework. MTD maps framework along with CFI chip support framework are used to support communicating with flash. Framework is modelled along the lines of spi-nor framework. HyperBus memory controller (HBMC) drivers calls hyperbus_register_device() to register a single HyperFlash device. HyperFlash core parses MMIO access information from DT, sets up the map_info struct, probes CFI flash and registers it with MTD framework. Some HBMC masters need calibration/training sequence[3] to be carried out, in order for DLL inside the controller to lock, by reading a known string/pattern. This is done by repeatedly reading CFI Query Identification String. Calibration needs to be done before trying to detect flash as part of CFI flash probe. HyperRAM is not supported at the moment. HyperBus specification can be found at[1] HyperFlash datasheet can be found at[2] [1] https://www.cypress.com/file/213356/download [2] https://www.cypress.com/file/213346/download [3] http://www.ti.com/lit/ug/spruid7b/spruid7b.pdf Table 12-5741. HyperFlash Access Sequence Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
280 lines
9.4 KiB
Plaintext
280 lines
9.4 KiB
Plaintext
menuconfig MTD
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tristate "Memory Technology Device (MTD) support"
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imply NVMEM
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help
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Memory Technology Devices are flash, RAM and similar chips, often
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used for solid state file systems on embedded devices. This option
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will provide the generic support for MTD drivers to register
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themselves with the kernel and for potential users of MTD devices
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to enumerate the devices which are present and obtain a handle on
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them. It will also allow you to select individual drivers for
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particular hardware and users of MTD devices. If unsure, say N.
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if MTD
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config MTD_TESTS
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tristate "MTD tests support (DANGEROUS)"
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depends on m
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help
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This option includes various MTD tests into compilation. The tests
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should normally be compiled as kernel modules. The modules perform
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various checks and verifications when loaded.
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WARNING: some of the tests will ERASE entire MTD device which they
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test. Do not use these tests unless you really know what you do.
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config MTD_CMDLINE_PARTS
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tristate "Command line partition table parsing"
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depends on MTD
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help
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Allow generic configuration of the MTD partition tables via the kernel
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command line. Multiple flash resources are supported for hardware where
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different kinds of flash memory are available.
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You will still need the parsing functions to be called by the driver
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for your particular device. It won't happen automatically. The
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SA1100 map driver (CONFIG_MTD_SA1100) has an option for this, for
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example.
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The format for the command line is as follows:
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mtdparts=<mtddef>[;<mtddef]
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<mtddef> := <mtd-id>:<partdef>[,<partdef>]
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<partdef> := <size>[@offset][<name>][ro]
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<mtd-id> := unique id used in mapping driver/device
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<size> := standard linux memsize OR "-" to denote all
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remaining space
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<name> := (NAME)
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Due to the way Linux handles the command line, no spaces are
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allowed in the partition definition, including mtd id's and partition
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names.
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Examples:
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1 flash resource (mtd-id "sa1100"), with 1 single writable partition:
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mtdparts=sa1100:-
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Same flash, but 2 named partitions, the first one being read-only:
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mtdparts=sa1100:256k(ARMboot)ro,-(root)
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If unsure, say 'N'.
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config MTD_OF_PARTS
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tristate "OpenFirmware partitioning information support"
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default y
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depends on OF
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help
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This provides a partition parsing function which derives
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the partition map from the children of the flash node,
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as described in Documentation/devicetree/bindings/mtd/partition.txt.
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config MTD_AR7_PARTS
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tristate "TI AR7 partitioning support"
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help
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TI AR7 partitioning support
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config MTD_BCM63XX_PARTS
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tristate "BCM63XX CFE partitioning support"
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depends on BCM63XX || BMIPS_GENERIC || COMPILE_TEST
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select CRC32
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select MTD_PARSER_IMAGETAG
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help
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This provides partition parsing for BCM63xx devices with CFE
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bootloaders.
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config MTD_BCM47XX_PARTS
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tristate "BCM47XX partitioning support"
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depends on BCM47XX || ARCH_BCM_5301X
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help
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This provides partitions parser for devices based on BCM47xx
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boards.
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menu "Partition parsers"
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source "drivers/mtd/parsers/Kconfig"
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endmenu
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comment "User Modules And Translation Layers"
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#
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# MTD block device support is select'ed if needed
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#
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config MTD_BLKDEVS
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tristate
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config MTD_BLOCK
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tristate "Caching block device access to MTD devices"
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depends on BLOCK
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select MTD_BLKDEVS
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help
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Although most flash chips have an erase size too large to be useful
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as block devices, it is possible to use MTD devices which are based
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on RAM chips in this manner. This block device is a user of MTD
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devices performing that function.
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At the moment, it is also required for the Journalling Flash File
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System(s) to obtain a handle on the MTD device when it's mounted
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(although JFFS and JFFS2 don't actually use any of the functionality
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of the mtdblock device).
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Later, it may be extended to perform read/erase/modify/write cycles
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on flash chips to emulate a smaller block size. Needless to say,
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this is very unsafe, but could be useful for file systems which are
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almost never written to.
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You do not need this option for use with the DiskOnChip devices. For
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those, enable NFTL support (CONFIG_NFTL) instead.
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config MTD_BLOCK_RO
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tristate "Readonly block device access to MTD devices"
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depends on MTD_BLOCK!=y && BLOCK
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select MTD_BLKDEVS
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help
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This allows you to mount read-only file systems (such as cramfs)
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from an MTD device, without the overhead (and danger) of the caching
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driver.
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You do not need this option for use with the DiskOnChip devices. For
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those, enable NFTL support (CONFIG_NFTL) instead.
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config FTL
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tristate "FTL (Flash Translation Layer) support"
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depends on BLOCK
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select MTD_BLKDEVS
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help
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This provides support for the original Flash Translation Layer which
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is part of the PCMCIA specification. It uses a kind of pseudo-
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file system on a flash device to emulate a block device with
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512-byte sectors, on top of which you put a 'normal' file system.
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You may find that the algorithms used in this code are patented
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unless you live in the Free World where software patents aren't
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legal - in the USA you are only permitted to use this on PCMCIA
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hardware, although under the terms of the GPL you're obviously
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permitted to copy, modify and distribute the code as you wish. Just
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not use it.
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config NFTL
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tristate "NFTL (NAND Flash Translation Layer) support"
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depends on BLOCK
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select MTD_BLKDEVS
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help
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This provides support for the NAND Flash Translation Layer which is
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used on M-Systems' DiskOnChip devices. It uses a kind of pseudo-
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file system on a flash device to emulate a block device with
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512-byte sectors, on top of which you put a 'normal' file system.
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You may find that the algorithms used in this code are patented
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unless you live in the Free World where software patents aren't
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legal - in the USA you are only permitted to use this on DiskOnChip
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hardware, although under the terms of the GPL you're obviously
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permitted to copy, modify and distribute the code as you wish. Just
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not use it.
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config NFTL_RW
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bool "Write support for NFTL"
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depends on NFTL
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help
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Support for writing to the NAND Flash Translation Layer, as used
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on the DiskOnChip.
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config INFTL
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tristate "INFTL (Inverse NAND Flash Translation Layer) support"
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depends on BLOCK
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select MTD_BLKDEVS
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help
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This provides support for the Inverse NAND Flash Translation
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Layer which is used on M-Systems' newer DiskOnChip devices. It
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uses a kind of pseudo-file system on a flash device to emulate
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a block device with 512-byte sectors, on top of which you put
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a 'normal' file system.
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You may find that the algorithms used in this code are patented
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unless you live in the Free World where software patents aren't
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legal - in the USA you are only permitted to use this on DiskOnChip
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hardware, although under the terms of the GPL you're obviously
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permitted to copy, modify and distribute the code as you wish. Just
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not use it.
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config RFD_FTL
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tristate "Resident Flash Disk (Flash Translation Layer) support"
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depends on BLOCK
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select MTD_BLKDEVS
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help
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This provides support for the flash translation layer known
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as the Resident Flash Disk (RFD), as used by the Embedded BIOS
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of General Software. There is a blurb at:
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http://www.gensw.com/pages/prod/bios/rfd.htm
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config SSFDC
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tristate "NAND SSFDC (SmartMedia) read only translation layer"
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depends on BLOCK
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select MTD_BLKDEVS
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help
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This enables read only access to SmartMedia formatted NAND
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flash. You can mount it with FAT file system.
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config SM_FTL
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tristate "SmartMedia/xD new translation layer"
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depends on BLOCK
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select MTD_BLKDEVS
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select MTD_NAND_ECC_SW_HAMMING
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help
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This enables EXPERIMENTAL R/W support for SmartMedia/xD
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FTL (Flash translation layer).
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Write support is only lightly tested, therefore this driver
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isn't recommended to use with valuable data (anyway if you have
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valuable data, do backups regardless of software/hardware you
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use, because you never know what will eat your data...)
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If you only need R/O access, you can use older R/O driver
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(CONFIG_SSFDC)
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config MTD_OOPS
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tristate "Log panic/oops to an MTD buffer"
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help
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This enables panic and oops messages to be logged to a circular
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buffer in a flash partition where it can be read back at some
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later point.
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config MTD_SWAP
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tristate "Swap on MTD device support"
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depends on MTD && SWAP
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select MTD_BLKDEVS
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help
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Provides volatile block device driver on top of mtd partition
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suitable for swapping. The mapping of written blocks is not saved.
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The driver provides wear leveling by storing erase counter into the
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OOB.
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config MTD_PARTITIONED_MASTER
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bool "Retain master device when partitioned"
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default n
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depends on MTD
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help
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For historical reasons, by default, either a master is present or
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several partitions are present, but not both. The concern was that
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data listed in multiple partitions was dangerous; however, SCSI does
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this and it is frequently useful for applications. This config option
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leaves the master in even if the device is partitioned. It also makes
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the parent of the partition device be the master device, rather than
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what lies behind the master.
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source "drivers/mtd/chips/Kconfig"
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source "drivers/mtd/maps/Kconfig"
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source "drivers/mtd/devices/Kconfig"
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source "drivers/mtd/nand/Kconfig"
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source "drivers/mtd/lpddr/Kconfig"
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source "drivers/mtd/spi-nor/Kconfig"
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source "drivers/mtd/ubi/Kconfig"
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source "drivers/mtd/hyperbus/Kconfig"
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endif # MTD
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