|  | # SPDX-License-Identifier: GPL-2.0-only | 
|  | menuconfig MTD_RAW_NAND | 
|  | tristate "Raw/Parallel NAND Device Support" | 
|  | select MTD_NAND_CORE | 
|  | select MTD_NAND_ECC | 
|  | help | 
|  | This enables support for accessing all type of raw/parallel | 
|  | NAND flash devices. For further information see | 
|  | <http://www.linux-mtd.infradead.org/doc/nand.html>. | 
|  |  | 
|  | if MTD_RAW_NAND | 
|  |  | 
|  | comment "Raw/parallel NAND flash controllers" | 
|  |  | 
|  | config MTD_NAND_DENALI | 
|  | tristate | 
|  |  | 
|  | config MTD_NAND_DENALI_PCI | 
|  | tristate "Denali NAND controller on Intel Moorestown" | 
|  | select MTD_NAND_DENALI | 
|  | depends on PCI | 
|  | help | 
|  | Enable the driver for NAND flash on Intel Moorestown, using the | 
|  | Denali NAND controller core. | 
|  |  | 
|  | config MTD_NAND_DENALI_DT | 
|  | tristate "Denali NAND controller as a DT device" | 
|  | select MTD_NAND_DENALI | 
|  | depends on HAS_DMA && HAVE_CLK && OF && HAS_IOMEM | 
|  | help | 
|  | Enable the driver for NAND flash on platforms using a Denali NAND | 
|  | controller as a DT device. | 
|  |  | 
|  | config MTD_NAND_AMS_DELTA | 
|  | tristate "Amstrad E3 NAND controller" | 
|  | depends on MACH_AMS_DELTA || COMPILE_TEST | 
|  | default y | 
|  | help | 
|  | Support for NAND flash on Amstrad E3 (Delta). | 
|  |  | 
|  | config MTD_NAND_OMAP2 | 
|  | tristate "OMAP2, OMAP3, OMAP4 and Keystone NAND controller" | 
|  | depends on ARCH_OMAP2PLUS || ARCH_KEYSTONE || ARCH_K3 || COMPILE_TEST | 
|  | depends on HAS_IOMEM | 
|  | depends on OMAP_GPMC | 
|  | help | 
|  | Support for NAND flash on Texas Instruments OMAP2, OMAP3, OMAP4 | 
|  | and Keystone platforms. | 
|  |  | 
|  | config MTD_NAND_OMAP_BCH | 
|  | depends on MTD_NAND_OMAP2 | 
|  | bool "Support hardware based BCH error correction" | 
|  | default n | 
|  | select BCH | 
|  | help | 
|  | This config enables the ELM hardware engine, which can be used to | 
|  | locate and correct errors when using BCH ECC scheme. This offloads | 
|  | the cpu from doing ECC error searching and correction. However some | 
|  | legacy OMAP families like OMAP2xxx, OMAP3xxx do not have ELM engine | 
|  | so this is optional for them. | 
|  |  | 
|  | config MTD_NAND_OMAP_BCH_BUILD | 
|  | def_tristate MTD_NAND_OMAP2 && MTD_NAND_OMAP_BCH | 
|  |  | 
|  | config MTD_NAND_AU1550 | 
|  | tristate "Au1550/1200 NAND support" | 
|  | depends on MIPS_ALCHEMY | 
|  | help | 
|  | This enables the driver for the NAND flash controller on the | 
|  | AMD/Alchemy 1550 SOC. | 
|  |  | 
|  | config MTD_NAND_NDFC | 
|  | tristate "IBM/MCC 4xx NAND controller" | 
|  | depends on 4xx | 
|  | select MTD_NAND_ECC_SW_HAMMING | 
|  | select MTD_NAND_ECC_SW_HAMMING_SMC | 
|  | help | 
|  | NDFC Nand Flash Controllers are integrated in IBM/AMCC's 4xx SoCs | 
|  |  | 
|  | config MTD_NAND_S3C2410 | 
|  | tristate "Samsung S3C NAND controller" | 
|  | depends on ARCH_S3C64XX | 
|  | help | 
|  | This enables the NAND flash controller on the S3C24xx and S3C64xx | 
|  | SoCs | 
|  |  | 
|  | No board specific support is done by this driver, each board | 
|  | must advertise a platform_device for the driver to attach. | 
|  |  | 
|  | config MTD_NAND_S3C2410_DEBUG | 
|  | bool "Samsung S3C NAND controller debug" | 
|  | depends on MTD_NAND_S3C2410 | 
|  | help | 
|  | Enable debugging of the S3C NAND driver | 
|  |  | 
|  | config MTD_NAND_S3C2410_CLKSTOP | 
|  | bool "Samsung S3C NAND IDLE clock stop" | 
|  | depends on MTD_NAND_S3C2410 | 
|  | default n | 
|  | help | 
|  | Stop the clock to the NAND controller when there is no chip | 
|  | selected to save power. This will mean there is a small delay | 
|  | when the is NAND chip selected or released, but will save | 
|  | approximately 5mA of power when there is nothing happening. | 
|  |  | 
|  | config MTD_NAND_SHARPSL | 
|  | tristate "Sharp SL Series (C7xx + others) NAND controller" | 
|  | depends on ARCH_PXA || COMPILE_TEST | 
|  | depends on HAS_IOMEM | 
|  |  | 
|  | config MTD_NAND_CAFE | 
|  | tristate "OLPC CAFÉ NAND controller" | 
|  | depends on PCI | 
|  | select REED_SOLOMON | 
|  | select REED_SOLOMON_DEC16 | 
|  | help | 
|  | Use NAND flash attached to the CAFÉ chip designed for the OLPC | 
|  | laptop. | 
|  |  | 
|  | config MTD_NAND_CS553X | 
|  | tristate "CS5535/CS5536 (AMD Geode companion) NAND controller" | 
|  | depends on X86_32 | 
|  | depends on !UML && HAS_IOMEM | 
|  | help | 
|  | The CS553x companion chips for the AMD Geode processor | 
|  | include NAND flash controllers with built-in hardware ECC | 
|  | capabilities; enabling this option will allow you to use | 
|  | these. The driver will check the MSRs to verify that the | 
|  | controller is enabled for NAND, and currently requires that | 
|  | the controller be in MMIO mode. | 
|  |  | 
|  | If you say "m", the module will be called cs553x_nand. | 
|  |  | 
|  | config MTD_NAND_ATMEL | 
|  | tristate "Atmel AT91 NAND Flash/SmartMedia NAND controller" | 
|  | depends on ARCH_AT91 || COMPILE_TEST | 
|  | depends on HAS_IOMEM | 
|  | select GENERIC_ALLOCATOR | 
|  | select MFD_ATMEL_SMC | 
|  | help | 
|  | Enables support for NAND Flash / Smart Media Card interface | 
|  | on Atmel AT91 processors. | 
|  |  | 
|  | config MTD_NAND_ORION | 
|  | tristate "Marvell Orion NAND controller" | 
|  | depends on PLAT_ORION | 
|  | help | 
|  | This enables the NAND flash controller on Orion machines. | 
|  |  | 
|  | No board specific support is done by this driver, each board | 
|  | must advertise a platform_device for the driver to attach. | 
|  |  | 
|  | config MTD_NAND_MARVELL | 
|  | tristate "Marvell EBU NAND controller" | 
|  | depends on PXA3xx || ARCH_MMP || PLAT_ORION || ARCH_MVEBU || \ | 
|  | COMPILE_TEST | 
|  | depends on HAS_IOMEM | 
|  | help | 
|  | This enables the NAND flash controller driver for Marvell boards, | 
|  | including: | 
|  | - PXA3xx processors (NFCv1) | 
|  | - 32-bit Armada platforms (XP, 37x, 38x, 39x) (NFCv2) | 
|  | - 64-bit Aramda platforms (7k, 8k, ac5) (NFCv2) | 
|  |  | 
|  | config MTD_NAND_SLC_LPC32XX | 
|  | tristate "NXP LPC32xx SLC NAND controller" | 
|  | depends on ARCH_LPC32XX || COMPILE_TEST | 
|  | depends on HAS_IOMEM | 
|  | help | 
|  | Enables support for NXP's LPC32XX SLC (i.e. for Single Level Cell | 
|  | chips) NAND controller. This is the default for the PHYTEC 3250 | 
|  | reference board which contains a NAND256R3A2CZA6 chip. | 
|  |  | 
|  | Please check the actual NAND chip connected and its support | 
|  | by the SLC NAND controller. | 
|  |  | 
|  | config MTD_NAND_MLC_LPC32XX | 
|  | tristate "NXP LPC32xx MLC NAND controller" | 
|  | depends on ARCH_LPC32XX || COMPILE_TEST | 
|  | depends on HAS_IOMEM | 
|  | help | 
|  | Uses the LPC32XX MLC (i.e. for Multi Level Cell chips) NAND | 
|  | controller. This is the default for the WORK92105 controller | 
|  | board. | 
|  |  | 
|  | Please check the actual NAND chip connected and its support | 
|  | by the MLC NAND controller. | 
|  |  | 
|  | config MTD_NAND_PASEMI | 
|  | tristate "PA Semi PWRficient NAND controller" | 
|  | depends on PPC_PASEMI | 
|  | help | 
|  | Enables support for NAND Flash interface on PA Semi PWRficient | 
|  | based boards | 
|  |  | 
|  | source "drivers/mtd/nand/raw/brcmnand/Kconfig" | 
|  |  | 
|  | config MTD_NAND_BCM47XXNFLASH | 
|  | tristate "BCM4706 BCMA NAND controller" | 
|  | depends on BCMA_NFLASH | 
|  | depends on BCMA | 
|  | help | 
|  | BCMA bus can have various flash memories attached, they are | 
|  | registered by bcma as platform devices. This enables driver for | 
|  | NAND flash memories. For now only BCM4706 is supported. | 
|  |  | 
|  | config MTD_NAND_MPC5121_NFC | 
|  | tristate "MPC5121 NAND controller" | 
|  | depends on PPC_MPC512x | 
|  | help | 
|  | This enables the driver for the NAND flash controller on the | 
|  | MPC5121 SoC. | 
|  |  | 
|  | config MTD_NAND_GPMI_NAND | 
|  | tristate "Freescale GPMI NAND controller" | 
|  | depends on MXS_DMA | 
|  | help | 
|  | Enables NAND Flash support for IMX23, IMX28 or IMX6. | 
|  | The GPMI controller is very powerful, with the help of BCH | 
|  | module, it can do the hardware ECC. The GPMI supports several | 
|  | NAND flashs at the same time. | 
|  |  | 
|  | config MTD_NAND_FSL_ELBC | 
|  | tristate "Freescale eLBC NAND controller" | 
|  | depends on FSL_SOC | 
|  | select FSL_LBC | 
|  | help | 
|  | Various Freescale chips, including the 8313, include a NAND Flash | 
|  | Controller Module with built-in hardware ECC capabilities. | 
|  | Enabling this option will enable you to use this to control | 
|  | external NAND devices. | 
|  |  | 
|  | config MTD_NAND_FSL_IFC | 
|  | tristate "Freescale IFC NAND controller" | 
|  | depends on FSL_SOC || ARCH_LAYERSCAPE || SOC_LS1021A || COMPILE_TEST | 
|  | depends on HAS_IOMEM | 
|  | select FSL_IFC | 
|  | select MEMORY | 
|  | help | 
|  | Various Freescale chips e.g P1010, include a NAND Flash machine | 
|  | with built-in hardware ECC capabilities. | 
|  | Enabling this option will enable you to use this to control | 
|  | external NAND devices. | 
|  |  | 
|  | config MTD_NAND_FSL_UPM | 
|  | tristate "Freescale UPM NAND controller" | 
|  | depends on PPC_83xx || PPC_85xx | 
|  | select FSL_LBC | 
|  | help | 
|  | Enables support for NAND Flash chips wired onto Freescale PowerPC | 
|  | processor localbus with User-Programmable Machine support. | 
|  |  | 
|  | config MTD_NAND_VF610_NFC | 
|  | tristate "Freescale VF610/MPC5125 NAND controller" | 
|  | depends on (SOC_VF610 || COMPILE_TEST) | 
|  | depends on HAS_IOMEM | 
|  | help | 
|  | Enables support for NAND Flash Controller on some Freescale | 
|  | processors like the VF610, MPC5125, MCF54418 or Kinetis K70. | 
|  | The driver supports a maximum 2k page size. With 2k pages and | 
|  | 64 bytes or more of OOB, hardware ECC with up to 32-bit error | 
|  | correction is supported. Hardware ECC is only enabled through | 
|  | device tree. | 
|  |  | 
|  | config MTD_NAND_MXC | 
|  | tristate "Freescale MXC NAND controller" | 
|  | depends on ARCH_MXC || COMPILE_TEST | 
|  | depends on HAS_IOMEM && OF | 
|  | help | 
|  | This enables the driver for the NAND flash controller on the | 
|  | MXC processors. | 
|  |  | 
|  | config MTD_NAND_SH_FLCTL | 
|  | tristate "Renesas SuperH FLCTL NAND controller" | 
|  | depends on SUPERH || COMPILE_TEST | 
|  | depends on HAS_IOMEM | 
|  | help | 
|  | Several Renesas SuperH CPU has FLCTL. This option enables support | 
|  | for NAND Flash using FLCTL. | 
|  |  | 
|  | config MTD_NAND_DAVINCI | 
|  | tristate "DaVinci/Keystone NAND controller" | 
|  | depends on ARCH_DAVINCI || (ARCH_KEYSTONE && TI_AEMIF) || COMPILE_TEST | 
|  | depends on HAS_IOMEM | 
|  | help | 
|  | Enable the driver for NAND flash chips on Texas Instruments | 
|  | DaVinci/Keystone processors. | 
|  |  | 
|  | config MTD_NAND_TXX9NDFMC | 
|  | tristate "TXx9 NAND controller" | 
|  | depends on SOC_TX4938 || COMPILE_TEST | 
|  | depends on HAS_IOMEM | 
|  | help | 
|  | This enables the NAND flash controller on the TXx9 SoCs. | 
|  |  | 
|  | config MTD_NAND_SOCRATES | 
|  | tristate "Socrates NAND controller" | 
|  | depends on SOCRATES | 
|  | help | 
|  | Enables support for NAND Flash chips wired onto Socrates board. | 
|  |  | 
|  | source "drivers/mtd/nand/raw/ingenic/Kconfig" | 
|  |  | 
|  | config MTD_NAND_FSMC | 
|  | tristate "ST Micros FSMC NAND controller" | 
|  | depends on OF && HAS_IOMEM | 
|  | depends on PLAT_SPEAR || ARCH_NOMADIK || ARCH_U8500 || COMPILE_TEST | 
|  | help | 
|  | Enables support for NAND Flash chips on the ST Microelectronics | 
|  | Flexible Static Memory Controller (FSMC) | 
|  |  | 
|  | config MTD_NAND_XWAY | 
|  | bool "Lantiq XWAY NAND controller" | 
|  | depends on LANTIQ && SOC_TYPE_XWAY | 
|  | help | 
|  | Enables support for NAND Flash chips on Lantiq XWAY SoCs. NAND is attached | 
|  | to the External Bus Unit (EBU). | 
|  |  | 
|  | config MTD_NAND_SUNXI | 
|  | tristate "Allwinner NAND controller" | 
|  | depends on ARCH_SUNXI || COMPILE_TEST | 
|  | depends on HAS_IOMEM | 
|  | help | 
|  | Enables support for NAND Flash chips on Allwinner SoCs. | 
|  |  | 
|  | config MTD_NAND_HISI504 | 
|  | tristate "Hisilicon Hip04 NAND controller" | 
|  | depends on ARCH_HISI || COMPILE_TEST | 
|  | depends on HAS_IOMEM | 
|  | help | 
|  | Enables support for NAND controller on Hisilicon SoC Hip04. | 
|  |  | 
|  | config MTD_NAND_QCOM | 
|  | tristate "QCOM NAND controller" | 
|  | depends on ARCH_QCOM || COMPILE_TEST | 
|  | depends on HAS_IOMEM | 
|  | help | 
|  | Enables support for NAND flash chips on SoCs containing the EBI2 NAND | 
|  | controller. This controller is found on IPQ806x SoC. | 
|  |  | 
|  | config MTD_NAND_MTK | 
|  | tristate "MTK NAND controller" | 
|  | depends on MTD_NAND_ECC_MEDIATEK | 
|  | depends on ARCH_MEDIATEK || COMPILE_TEST | 
|  | depends on HAS_IOMEM | 
|  | help | 
|  | Enables support for NAND controller on MTK SoCs. | 
|  | This controller is found on mt27xx, mt81xx, mt65xx SoCs. | 
|  |  | 
|  | config MTD_NAND_MXIC | 
|  | tristate "Macronix raw NAND controller" | 
|  | depends on HAS_IOMEM || COMPILE_TEST | 
|  | help | 
|  | This selects the Macronix raw NAND controller driver. | 
|  |  | 
|  | config MTD_NAND_TEGRA | 
|  | tristate "NVIDIA Tegra NAND controller" | 
|  | depends on ARCH_TEGRA || COMPILE_TEST | 
|  | depends on HAS_IOMEM | 
|  | help | 
|  | Enables support for NAND flash controller on NVIDIA Tegra SoC. | 
|  | The driver has been developed and tested on a Tegra 2 SoC. DMA | 
|  | support, raw read/write page as well as HW ECC read/write page | 
|  | is supported. Extra OOB bytes when using HW ECC are currently | 
|  | not supported. | 
|  |  | 
|  | config MTD_NAND_STM32_FMC2 | 
|  | tristate "Support for NAND controller on STM32MP SoCs" | 
|  | depends on ARCH_STM32 || COMPILE_TEST | 
|  | select MFD_SYSCON | 
|  | help | 
|  | Enables support for NAND Flash chips on SoCs containing the FMC2 | 
|  | NAND controller. This controller is found on STM32MP SoCs. | 
|  | The controller supports a maximum 8k page size and supports | 
|  | a maximum 8-bit correction error per sector of 512 bytes. | 
|  |  | 
|  | config MTD_NAND_MESON | 
|  | tristate "Support for NAND controller on Amlogic's Meson SoCs" | 
|  | depends on COMMON_CLK && (ARCH_MESON || COMPILE_TEST) | 
|  | select MFD_SYSCON | 
|  | help | 
|  | Enables support for NAND controller on Amlogic's Meson SoCs. | 
|  | This controller is found on Meson SoCs. | 
|  |  | 
|  | config MTD_NAND_GPIO | 
|  | tristate "GPIO assisted NAND controller" | 
|  | depends on GPIOLIB || COMPILE_TEST | 
|  | depends on HAS_IOMEM | 
|  | help | 
|  | This enables a NAND flash driver where control signals are | 
|  | connected to GPIO pins, and commands and data are communicated | 
|  | via a memory mapped interface. | 
|  |  | 
|  | config MTD_NAND_PLATFORM | 
|  | tristate "Generic NAND controller" | 
|  | depends on HAS_IOMEM | 
|  | help | 
|  | This implements a generic NAND driver for on-SOC platform | 
|  | devices. You will need to provide platform-specific functions | 
|  | via platform_data. | 
|  |  | 
|  | config MTD_NAND_CADENCE | 
|  | tristate "Support Cadence NAND (HPNFC) controller" | 
|  | depends on OF && HAS_IOMEM | 
|  | help | 
|  | Enable the driver for NAND flash on platforms using a Cadence NAND | 
|  | controller. | 
|  |  | 
|  | config MTD_NAND_ARASAN | 
|  | tristate "Support for Arasan NAND flash controller" | 
|  | depends on HAS_IOMEM && HAS_DMA | 
|  | select BCH | 
|  | help | 
|  | Enables the driver for the Arasan NAND flash controller on | 
|  | Zynq Ultrascale+ MPSoC. | 
|  |  | 
|  | config MTD_NAND_INTEL_LGM | 
|  | tristate "Support for NAND controller on Intel LGM SoC" | 
|  | depends on OF | 
|  | depends on HAS_IOMEM | 
|  | help | 
|  | Enables support for NAND Flash chips on Intel's LGM SoC. | 
|  | NAND flash controller interfaced through the External Bus Unit. | 
|  |  | 
|  | config MTD_NAND_ROCKCHIP | 
|  | tristate "Rockchip NAND controller" | 
|  | depends on ARCH_ROCKCHIP && HAS_IOMEM | 
|  | help | 
|  | Enables support for NAND controller on Rockchip SoCs. | 
|  | There are four different versions of NAND FLASH Controllers, | 
|  | including: | 
|  | NFC v600: RK2928, RK3066, RK3188 | 
|  | NFC v622: RK3036, RK3128 | 
|  | NFC v800: RK3308, RV1108 | 
|  | NFC v900: PX30, RK3326 | 
|  |  | 
|  | config MTD_NAND_PL35X | 
|  | tristate "ARM PL35X NAND controller" | 
|  | depends on OF | 
|  | depends on PL353_SMC | 
|  | help | 
|  | Enables support for PrimeCell SMC PL351 and PL353 NAND | 
|  | controller found on Zynq7000. | 
|  |  | 
|  | config MTD_NAND_RENESAS | 
|  | tristate "Renesas R-Car Gen3 & RZ/N1 NAND controller" | 
|  | depends on ARCH_RENESAS || COMPILE_TEST | 
|  | help | 
|  | Enables support for the NAND controller found on Renesas R-Car | 
|  | Gen3 and RZ/N1 SoC families. | 
|  |  | 
|  | comment "Misc" | 
|  |  | 
|  | config MTD_SM_COMMON | 
|  | tristate | 
|  | default n | 
|  |  | 
|  | config MTD_NAND_NANDSIM | 
|  | tristate "Support for NAND Flash Simulator" | 
|  | help | 
|  | The simulator may simulate various NAND flash chips for the | 
|  | MTD nand layer. | 
|  |  | 
|  | config MTD_NAND_RICOH | 
|  | tristate "Ricoh xD card reader" | 
|  | default n | 
|  | depends on PCI | 
|  | select MTD_SM_COMMON | 
|  | help | 
|  | Enable support for Ricoh R5C852 xD card reader | 
|  | You also need to enable either | 
|  | NAND SSFDC (SmartMedia) read only translation layer' or new | 
|  | experimental, readwrite | 
|  | 'SmartMedia/xD new translation layer' | 
|  |  | 
|  | config MTD_NAND_DISKONCHIP | 
|  | tristate "DiskOnChip 2000, Millennium and Millennium Plus (NAND reimplementation)" | 
|  | depends on HAS_IOMEM | 
|  | select REED_SOLOMON | 
|  | select REED_SOLOMON_DEC16 | 
|  | help | 
|  | This is a reimplementation of M-Systems DiskOnChip 2000, | 
|  | Millennium and Millennium Plus as a standard NAND device driver, | 
|  | as opposed to the earlier self-contained MTD device drivers. | 
|  | This should enable, among other things, proper JFFS2 operation on | 
|  | these devices. | 
|  |  | 
|  | config MTD_NAND_DISKONCHIP_PROBE_ADVANCED | 
|  | bool "Advanced detection options for DiskOnChip" | 
|  | depends on MTD_NAND_DISKONCHIP | 
|  | help | 
|  | This option allows you to specify nonstandard address at which to | 
|  | probe for a DiskOnChip, or to change the detection options.  You | 
|  | are unlikely to need any of this unless you are using LinuxBIOS. | 
|  | Say 'N'. | 
|  |  | 
|  | config MTD_NAND_DISKONCHIP_PROBE_ADDRESS | 
|  | hex "Physical address of DiskOnChip" if MTD_NAND_DISKONCHIP_PROBE_ADVANCED | 
|  | depends on MTD_NAND_DISKONCHIP | 
|  | default "0" | 
|  | help | 
|  | By default, the probe for DiskOnChip devices will look for a | 
|  | DiskOnChip at every multiple of 0x2000 between 0xC8000 and 0xEE000. | 
|  | This option allows you to specify a single address at which to probe | 
|  | for the device, which is useful if you have other devices in that | 
|  | range which get upset when they are probed. | 
|  |  | 
|  | (Note that on PowerPC, the normal probe will only check at | 
|  | 0xE4000000.) | 
|  |  | 
|  | Normally, you should leave this set to zero, to allow the probe at | 
|  | the normal addresses. | 
|  |  | 
|  | config MTD_NAND_DISKONCHIP_PROBE_HIGH | 
|  | bool "Probe high addresses" | 
|  | depends on MTD_NAND_DISKONCHIP_PROBE_ADVANCED | 
|  | help | 
|  | By default, the probe for DiskOnChip devices will look for a | 
|  | DiskOnChip at every multiple of 0x2000 between 0xC8000 and 0xEE000. | 
|  | This option changes to make it probe between 0xFFFC8000 and | 
|  | 0xFFFEE000.  Unless you are using LinuxBIOS, this is unlikely to be | 
|  | useful to you.  Say 'N'. | 
|  |  | 
|  | config MTD_NAND_DISKONCHIP_BBTWRITE | 
|  | bool "Allow BBT writes on DiskOnChip Millennium and 2000TSOP" | 
|  | depends on MTD_NAND_DISKONCHIP | 
|  | help | 
|  | On DiskOnChip devices shipped with the INFTL filesystem (Millennium | 
|  | and 2000 TSOP/Alon), Linux reserves some space at the end of the | 
|  | device for the Bad Block Table (BBT).  If you have existing INFTL | 
|  | data on your device (created by non-Linux tools such as M-Systems' | 
|  | DOS drivers), your data might overlap the area Linux wants to use for | 
|  | the BBT.  If this is a concern for you, leave this option disabled and | 
|  | Linux will not write BBT data into this area. | 
|  | The downside of leaving this option disabled is that if bad blocks | 
|  | are detected by Linux, they will not be recorded in the BBT, which | 
|  | could cause future problems. | 
|  | Once you enable this option, new filesystems (INFTL or others, created | 
|  | in Linux or other operating systems) will not use the reserved area. | 
|  | The only reason not to enable this option is to prevent damage to | 
|  | preexisting filesystems. | 
|  | Even if you leave this disabled, you can enable BBT writes at module | 
|  | load time (assuming you build diskonchip as a module) with the module | 
|  | parameter "inftl_bbt_write=1". | 
|  |  | 
|  | endif # MTD_RAW_NAND |