nuttx/drivers/mtd/Kconfig

#
# For a description of the syntax of this configuration file,
# see misc/tools/kconfig-language.txt.
#

comment "MTD Configuration"

config MTD_PARTITION
	bool "Support MTD partitions"
	default n
	---help---
		MTD partitions are build as MTD drivers that manage a sub-region
		of the FLASH memory.  The contain the original FLASH MTD driver and
		simply manage all accesses to assure that (1) FLASH accesses are
		always offset to the beginning of the partition, and (2) that FLASH
		accesses do not extend outside of the partition.

		A FLASH device may be broken up into several partitions managed,
		each managed by a separate MTD driver.  The MTD parition interface
		is described in:

			include/nuttx/mtd/mtd.h
			FAR struct mtd_dev_s *mtd_partition(FAR struct mtd_dev_s *mtd, off_t offset, off_t nblocks);

		Each call to mtd_partition() will create a new MTD driver instance
		managing the sub-region of flash beginning at 'offset' (in blocks)
		and of size 'nblocks' on the device specified by 'mtd'.

config MTD_BYTE_WRITE
	bool "Byte write"
	default n
	---help---
		Some devices (such as the EON EN25F80) support writing an arbitrary
		number of bytes to FLASH. This setting enables MTD interfaces to
		support such writes.  The SMART file system can take advantage of
		this option if it is enabled.

config MTD_CONFIG
	bool "Enable Dev Config (MTD based) device"
	default n
	---help---
		Provides a /dev/config device for saving / restoring application
		configuration data to a standard MTD device or partition.

config MTD_CONFIG_RAM_CONSOLIDATE
	bool "Always use RAM consolidation method (work in progress)"
	default n
	---help---
		When the MTD device used for /dev/config contains more than one
		erase block, the "unused entry" consolidation reserves one erase
		block by default for cleanup purposes.  This consumes the minimum
		amount of RAM, however it "wastes" one erase block on the device.
		(For configurations that have only a single erase block assigned
		to the config device, RAM consolidation is the ONLY option.)

		Another apporach is to allow the driver to use the entire MTD
		device (or partition) to save config data, and then allocate a
		RAM buffer (the size of one erase block) to perform the
		consolidation.  Enabling this feature basically trades off RAM
		usage for FLASH usage.  If the MTD device used for config data
		has small erase sizes (4K, etc.) and there is plenty of free RAM
		available, then this is probably a good option.

		Another benefit of this option is it reduces code space a bit
		since the "reserved block" consolidate routine is not needed.

config MTD_CONFIG_ERASEDVALUE
	hex "Erased value of bytes on the MTD device"
	depends on MTD_CONFIG
	default 0xff
	---help---
		Specifies the value of the erased state of the MTD FLASH.  For
		most FLASH parts, this is 0xff, but could also be zero depending
		on the device.

comment "MTD Device Drivers"

config MTD_NAND
	bool "Enable NAND support"
	default n
	---help---
		Enable support for NAND FLASH devices.

config ARCH_NAND_HWECC
	bool
	default n

if MTD_NAND

config MTD_NAND_MAXNUMBLOCKS
	int "Max blocks"
	default 1024
	---help---
		Maximum number of blocks in a device

config MTD_NAND_MAXNUMPAGESPERBLOCK
	int "Max pages per block"
	default 256
	---help---
		Maximum number of pages in one block

config MTD_NAND_MAXPAGEDATASIZE
	int "Max page size"
	default 4096
	---help---
		Maximum size of the data area of one page, in bytes.

config MTD_NAND_MAXPAGESPARESIZE
	int "Max size of spare area"
	default 256
	---help---
		Maximum size of the spare area of one page, in bytes.

config MTD_NAND_MAXSPAREECCBYTES
	int "Max number of ECC bytes"
	default 48
	---help---
		Maximum number of ECC bytes stored in the spare for one single page.

config MTD_NAND_BLOCKCHECK
	bool "Block check"
	default y
	---help---
		Enable support for ECC and bad block checking.

if MTD_NAND_BLOCKCHECK

config MTD_NAND_SWECC
	bool "Sofware ECC support"
	default n if ARCH_NAND_HWECC
	default y if !ARCH_NAND_HWECC
	---help---
		Build in logic to support software calculation of ECC.

config MTD_NAND_HWECC
	bool "Hardware ECC support"
	default n
	depends on ARCH_NAND_HWECC
	---help---
		Build in logic to support hardware calculation of ECC.

config MTD_NAND_MAXSPAREEXTRABYTES
	int "Max extra free bytes"
	default 206
	---help---
		Maximum number of extra free bytes inside the spare area of a page.

config MTD_NAND_MAX_HWECCSIZE
	int "Max H/W ECC size"
	default 200
	depends on MTD_NAND_HWECC
	---help---
		Maximum HW ECC size

config MTD_NAND_EMBEDDEDECC
	bool "Support devices with Embedded ECC"
	default n
	---help---
		Some NAND devices have internal, embedded ECC function.  One (the
		only one supported) is Micron, 4-bit ECC, device size = 1Gb or 2Gb
		or 4Gb.

endif # MTD_NAND

config RAMMTD
	bool "RAM-based MTD driver"
	default n
	---help---
		Build support for a RAM-based MTD driver.

if RAMMTD

config RAMMTD_BLOCKSIZE
	int "RAM MTD block size"
	default 512

config RAMMTD_ERASESIZE
	int "RAM MTD erase block size"
	default 4096

config RAMMTD_ERASESTATE
	hex "Simulated erase state"
	default 0xff

config RAMMTD_FLASHSIM
	bool "RAM MTD FLASH Simulation"
	default n
	---help---
		RAMMTD_FLASHSIM will add some extra logic to improve the level of
		FLASH simulation.

endif

config MTD_AT24XX
	bool "I2C-based AT24xx eeprom"
	default n
	select I2C
	---help---
		Build support for I2C-based AT24CXX EEPROM(at24c32, at24c64,
		at24c128, at24c256)

if MTD_AT24XX

config AT24XX_SIZE
	int "AT24xx size (kbit)"
	default 64
		---help---
		This is the XX in the AT24Cxx part number.  For example, if you have a
		AT 24C512, then the correct value is 512.  This value is also the capacity
		of the part in kilobits.  For example, the 24C512 supports 512 Kbits or
		512 /8 = 64 KiB.

config AT24XX_ADDR
	hex "AT24XX I2C address"
	default 0x50
	range 0x50 0x57

endif

config MTD_AT25
	bool "SPI-based AT25 FLASH"
	default n
	select SPI

if MTD_AT25

config AT25_SPIMODE
	int "AT25 SPI Mode"
	default 0

config AT25_SPIFREQUENCY
	int "AT25 SPI Frequency"
	default 20000000

endif

config MTD_AT45DB
	bool "SPI-based AT45DB flash"
	default n
	select SPI

if MTD_AT45DB

config AT45DB_FREQUENCY
	int "AT45DB frequency"
	default 1000000

config AT45DB_PREWAIT
	bool "Enable higher performance write logic"
	default y

config AT45DB_PWRSAVE
	bool "Enable power save"
	default n

endif

config MTD_M25P
	bool "SPI-based M25P FLASH"
	default n
	select SPI

if MTD_M25P

config M25P_SPIMODE
	int "M25P SPI mode"
	default 0

config M25P_MANUFACTURER
	hex "M25P manufacturers ID"
	default 0x20
	---help---
		Various manufacturers may have produced the parts.  0x20 is the manufacturer ID
		for the STMicro MP25x serial FLASH.  If, for example, you are using the a Macronix
		International MX25 serial FLASH, the correct manufacturer ID would be 0xc2.

config M25P_MEMORY_TYPE
	hex "M25P memory type ID"
	default 0x20
	---help---
		The memory type for M25 "P" series is 0x20, but the driver also supports "F" series
		devices, such as the EON EN25F80 part which adds a 4K sector erase capability.  The
		memory type for "F" series parts from EON is 0x31.  The 4K sector erase size will
		automatically be enabled when filessytems that can use it are enabled, such as SMART.

config M25P_SUBSECTOR_ERASE
	bool "Sub-Sector Erase"
	default n
	---help---
		Some devices (such as the EON EN25F80) support a smaller erase block
		size (4K vs 64K).  This option enables support for sub-sector erase.
		The SMART file system can take advantage of this option if it is enabled.

endif

config MTD_SMART
	bool "Sector Mapped Allocation for Really Tiny (SMART) Flash support"
	default n
	---help---
		The MP25x series of Flash devices are typically very small and have a very large
		erase block size.  This causes issues with the standard Flash Translation Layer
		block driver since it tries to allocate a RAM block the size of a flash erase
		block, which is typically 64K.  This block driver uses a different approach
		to sacrifice performance for RAM memory footprint by saving data in sectors
		(typically 2K - 4K based on memory size) and relocating sectors as needed when
		an erase block needs to be erased.

config MTD_SMART_SECTOR_SIZE
	int "SMART Device sector size"
    depends on MTD_SMART
	default 1024
	---help---
		Sets the size of a single alloction on the SMART device.  Larger sector sizes
		reduce overhead per sector, but cause more wasted space with a lot of smaller
		files.

config MTD_RAMTRON
	bool "SPI-based RAMTRON NVRAM Devices FM25V10"
	default n
	select SPI
	---help---
		SPI-based RAMTRON NVRAM Devices FM25V10

config MTD_SST25
	bool "SPI-based SST25 FLASH"
	default n
	select SPI

if MTD_SST25

config SST25_SPIMODE
	int "SST25 SPI Mode"
	default 0

config SST25_SPIFREQUENCY
	int "SST25 SPI Frequency"
	default 20000000

config SST25_READONLY
	bool "SST25 Read-Only FLASH"
	default n

config SST25_SECTOR512
	bool "Simulate 512 byte Erase Blocks"
	default n

config SST25_SLOWWRITE
	bool
	default n
	---help---
		There used to be a bug in the current code when using the higher speed AAI
		write sequence. The nature of the bug is that the WRDI instruction is not
		working. At the end of the AAI sequence, the status register continues to
		report that the SST25 is write enabled (WEL bit) and in AAI mode (AAI
		bit).  This has been fixed by David Sidrane!

config SST25_SLOWREAD
	bool
	default n

endif

config MTD_SST39FV
	bool "SST39FV NOR FLASH"
	default n
	---help---
		Selects 16-bit SST NOR FLASH.  This includes support for:

		SST39FV1601/SST39FV1602:  2Mb
		SST39FV3201/SST39FV3202:  4Mb

if MTD_SST39FV

config SST39VF_BASE_ADDRESS
	hex "SST39FV bass address"
	default 0x00000000
	---help---
		This is the address where the SST29VF FLASH can be found in memory.

endif

config MTD_W25
	bool "SPI-based W25 FLASH"
	default n
	select SPI

if MTD_W25

config W25_SPIMODE
	int "W25 SPI Mode"
	default 0

config W25_SPIFREQUENCY
	int "W25 SPI Frequency"
	default 20000000

config W25_READONLY
	bool "W25 Read-Only FLASH"
	default n

config W25_SECTOR512
	bool "Simulate 512 byte Erase Blocks"
	default n

config W25_SLOWREAD
	bool
	default n

endif