linux-arkmicro/u-boot/drivers/mtd/nand/Kconfig

menuconfig NAND
	bool "NAND Device Support"
if NAND

config SYS_NAND_SELF_INIT
	bool
	help
	  This option, if enabled, provides more flexible and linux-like
	  NAND initialization process.

config NAND_DENALI
	bool
	select SYS_NAND_SELF_INIT
	imply CMD_NAND

config NAND_DENALI_DT
	bool "Support Denali NAND controller as a DT device"
	select NAND_DENALI
	depends on OF_CONTROL && DM
	help
	  Enable the driver for NAND flash on platforms using a Denali NAND
	  controller as a DT device.

config NAND_DENALI_SPARE_AREA_SKIP_BYTES
	int "Number of bytes skipped in OOB area"
	depends on NAND_DENALI
	range 0 63
	help
	  This option specifies the number of bytes to skip from the beginning
	  of OOB area before last ECC sector data starts.  This is potentially
	  used to preserve the bad block marker in the OOB area.

config NAND_OMAP_GPMC
	bool "Support OMAP GPMC NAND controller"
	depends on ARCH_OMAP2PLUS
	help
	  Enables omap_gpmc.c driver for OMAPx and AMxxxx platforms.
	  GPMC controller is used for parallel NAND flash devices, and can
	  do ECC calculation (not ECC error detection) for HAM1, BCH4, BCH8
	  and BCH16 ECC algorithms.

config NAND_OMAP_GPMC_PREFETCH
	bool "Enable GPMC Prefetch"
	depends on NAND_OMAP_GPMC
	default y
	help
	  On OMAP platforms that use the GPMC controller
	  (CONFIG_NAND_OMAP_GPMC_PREFETCH), this options enables the code that
	  uses the prefetch mode to speed up read operations.

config NAND_OMAP_ELM
	bool "Enable ELM driver for OMAPxx and AMxx platforms."
	depends on NAND_OMAP_GPMC && !OMAP34XX
	help
	  ELM controller is used for ECC error detection (not ECC calculation)
	  of BCH4, BCH8 and BCH16 ECC algorithms.
	  Some legacy platforms like OMAP3xx do not have in-built ELM h/w engine,
	  thus such SoC platforms need to depend on software library for ECC error
	  detection. However ECC calculation on such plaforms would still be
	  done by GPMC controller.

config NAND_VF610_NFC
	bool "Support for Freescale NFC for VF610"
	select SYS_NAND_SELF_INIT
	imply CMD_NAND
	help
	  Enables support for NAND Flash Controller on some Freescale
	  processors like the VF610, MCF54418 or Kinetis K70.
	  The driver supports a maximum 2k page size. The driver
	  currently does not support hardware ECC.

choice
	prompt "Hardware ECC strength"
	depends on NAND_VF610_NFC
	default SYS_NAND_VF610_NFC_45_ECC_BYTES
	help
	  Select the ECC strength used in the hardware BCH ECC block.

config SYS_NAND_VF610_NFC_45_ECC_BYTES
	bool "24-error correction (45 ECC bytes)"

config SYS_NAND_VF610_NFC_60_ECC_BYTES
	bool "32-error correction (60 ECC bytes)"

endchoice

config NAND_PXA3XX
	bool "Support for NAND on PXA3xx and Armada 370/XP/38x"
	select SYS_NAND_SELF_INIT
	imply CMD_NAND
	help
	  This enables the driver for the NAND flash device found on
	  PXA3xx processors (NFCv1) and also on Armada 370/XP (NFCv2).

config NAND_SUNXI
	bool "Support for NAND on Allwinner SoCs"
	default ARCH_SUNXI
	depends on MACH_SUN4I || MACH_SUN5I || MACH_SUN7I || MACH_SUN8I
	select SYS_NAND_SELF_INIT
	select SYS_NAND_U_BOOT_LOCATIONS
	select SPL_NAND_SUPPORT
	imply CMD_NAND
	---help---
	Enable support for NAND. This option enables the standard and
	SPL drivers.
	The SPL driver only supports reading from the NAND using DMA
	transfers.

if NAND_SUNXI

config NAND_SUNXI_SPL_ECC_STRENGTH
	int "Allwinner NAND SPL ECC Strength"
	default 64

config NAND_SUNXI_SPL_ECC_SIZE
	int "Allwinner NAND SPL ECC Step Size"
	default 1024

config NAND_SUNXI_SPL_USABLE_PAGE_SIZE
	int "Allwinner NAND SPL Usable Page Size"
	default 1024

endif

config NAND_ARASAN
	bool "Configure Arasan Nand"
	select SYS_NAND_SELF_INIT
	imply CMD_NAND
	help
	  This enables Nand driver support for Arasan nand flash
	  controller. This uses the hardware ECC for read and
	  write operations.

config NAND_MXC
	bool "MXC NAND support"
	depends on CPU_ARM926EJS || CPU_ARM1136 || MX5
	imply CMD_NAND
	help
	  This enables the NAND driver for the NAND flash controller on the
	  i.MX27 / i.MX31 / i.MX5 rocessors.

config NAND_MXS
	bool "MXS NAND support"
	depends on MX23 || MX28 || MX6 || MX7
	select SYS_NAND_SELF_INIT
	imply CMD_NAND
	select APBH_DMA
	select APBH_DMA_BURST if ARCH_MX6 || ARCH_MX7
	select APBH_DMA_BURST8 if ARCH_MX6 || ARCH_MX7
	help
	  This enables NAND driver for the NAND flash controller on the
	  MXS processors.

if NAND_MXS

config NAND_MXS_DT
	bool "Support MXS NAND controller as a DT device"
	depends on OF_CONTROL && MTD
	help
	  Enable the driver for MXS NAND flash on platforms using
	  device tree.

config NAND_MXS_USE_MINIMUM_ECC
	bool "Use minimum ECC strength supported by the controller"
	default false

endif

config NAND_ZYNQ
	bool "Support for Zynq Nand controller"
	select SYS_NAND_SELF_INIT
	imply CMD_NAND
	help
	  This enables Nand driver support for Nand flash controller
	  found on Zynq SoC.

config NAND_ZYNQ_USE_BOOTLOADER1_TIMINGS
	bool "Enable use of 1st stage bootloader timing for NAND"
	depends on NAND_ZYNQ
	help
	  This flag prevent U-boot reconfigure NAND flash controller and reuse
	  the NAND timing from 1st stage bootloader.
	  
config NAND_ARKMICRO
	bool "Support for Arkmicro Nand controller"
	select SYS_NAND_SELF_INIT
	imply CMD_NAND
	help
	  This enables Nand driver support for Nand flash controller
	  found on Arkmicro SoC.	  

comment "Generic NAND options"

config SYS_NAND_BLOCK_SIZE
	hex "NAND chip eraseblock size"
	depends on ARCH_SUNXI
	help
	  Number of data bytes in one eraseblock for the NAND chip on the
	  board. This is the multiple of NAND_PAGE_SIZE and the number of
	  pages.

config SYS_NAND_PAGE_SIZE
	hex "NAND chip page size"
	depends on ARCH_SUNXI
	help
	  Number of data bytes in one page for the NAND chip on the
	  board, not including the OOB area.

config SYS_NAND_OOBSIZE
	hex "NAND chip OOB size"
	depends on ARCH_SUNXI
	help
	  Number of bytes in the Out-Of-Band area for the NAND chip on
	  the board.

# Enhance depends when converting drivers to Kconfig which use this config
# option (mxc_nand, ndfc, omap_gpmc).
config SYS_NAND_BUSWIDTH_16BIT
	bool "Use 16-bit NAND interface"
	depends on NAND_VF610_NFC || NAND_OMAP_GPMC || NAND_MXC || ARCH_DAVINCI
	help
	  Indicates that NAND device has 16-bit wide data-bus. In absence of this
	  config, bus-width of NAND device is assumed to be either 8-bit and later
	  determined by reading ONFI params.
	  Above config is useful when NAND device's bus-width information cannot
	  be determined from on-chip ONFI params, like in following scenarios:
	  - SPL boot does not support reading of ONFI parameters. This is done to
	    keep SPL code foot-print small.
	  - In current U-Boot flow using nand_init(), driver initialization
	    happens in board_nand_init() which is called before any device probe
	    (nand_scan_ident + nand_scan_tail), thus device's ONFI parameters are
	    not available while configuring controller. So a static CONFIG_NAND_xx
	    is needed to know the device's bus-width in advance.

if SPL

config SYS_NAND_U_BOOT_LOCATIONS
	bool "Define U-boot binaries locations in NAND"
	help
	Enable CONFIG_SYS_NAND_U_BOOT_OFFS though Kconfig.
	This option should not be enabled when compiling U-boot for boards
	defining CONFIG_SYS_NAND_U_BOOT_OFFS in their include/configs/<board>.h
	file.

config SYS_NAND_U_BOOT_OFFS
	hex "Location in NAND to read U-Boot from"
	default 0x800000 if NAND_SUNXI
	depends on SYS_NAND_U_BOOT_LOCATIONS
	help
	Set the offset from the start of the nand where u-boot should be
	loaded from.

config SYS_NAND_U_BOOT_OFFS_REDUND
	hex "Location in NAND to read U-Boot from"
	default SYS_NAND_U_BOOT_OFFS
	depends on SYS_NAND_U_BOOT_LOCATIONS
	help
	Set the offset from the start of the nand where the redundant u-boot
	should be loaded from.

config SPL_NAND_AM33XX_BCH
	bool "Enables SPL-NAND driver which supports ELM based"
	depends on NAND_OMAP_GPMC && !OMAP34XX
	default y
        help
	  Hardware ECC correction. This is useful for platforms which have ELM
	  hardware engine and use NAND boot mode.
	  Some legacy platforms like OMAP3xx do not have in-built ELM h/w engine,
	  so those platforms should use CONFIG_SPL_NAND_SIMPLE for enabling
          SPL-NAND driver with software ECC correction support.

config SPL_NAND_DENALI
	bool "Support Denali NAND controller for SPL"
	help
	  This is a small implementation of the Denali NAND controller
	  for use on SPL.

config SPL_NAND_SIMPLE
	bool "Use simple SPL NAND driver"
	depends on !SPL_NAND_AM33XX_BCH
	help
	  Support for NAND boot using simple NAND drivers that
	  expose the cmd_ctrl() interface.
endif

endif   # if NAND