kernel can not detect flash device.

[zydla son]

Hi,
    
    My target platform is ForcePowerCore 6750 which has four userflash(AM29F016) and I choose the relative options according to the "Linux MTD, JFFS HOWTO",but kernel can not detect flash device.
    Some infos:
_______________________________________________________________________________
physmap flash device: 200000 at ffe00000   /* system address range is from ffe0.0000 to ffff.ffff */
Physically mapped flash: Found no CFI device at location zero

    My .config(about MTD)
_______________________________________________________________________________
#
# Memory Technology Devices (MTD)
#
CONFIG_MTD=y
CONFIG_MTD_DEBUG=y
CONFIG_MTD_DEBUG_VERBOSE=3
# CONFIG_MTD_PARTITIONS is not set
# CONFIG_MTD_REDBOOT_PARTS is not set
# CONFIG_MTD_BOOTLDR_PARTS is not set
# CONFIG_MTD_CHAR is not set
# CONFIG_MTD_BLOCK is not set
# CONFIG_MTD_BLOCK_RO is not set
# CONFIG_FTL is not set
# CONFIG_NFTL is not set

#
# RAM/ROM/Flash chip drivers
#
CONFIG_MTD_CFI=y
CONFIG_MTD_CFI_VIRTUAL_ER=y
CONFIG_MTD_CFI_ADV_OPTIONS=y
CONFIG_MTD_CFI_NOSWAP=y
# CONFIG_MTD_CFI_BE_BYTE_SWAP is not set
# CONFIG_MTD_CFI_LE_BYTE_SWAP is not set
# CONFIG_MTD_CFI_LART_BIT_SWAP is not set
CONFIG_MTD_CFI_GEOMETRY=y
CONFIG_MTD_CFI_B1=y
# CONFIG_MTD_CFI_B2 is not set
# CONFIG_MTD_CFI_B4 is not set
CONFIG_MTD_CFI_I1=y
# CONFIG_MTD_CFI_I2 is not set
CONFIG_MTD_CFI_I4=y
# CONFIG_MTD_CFI_INTELEXT is not set
CONFIG_MTD_CFI_AMDSTD=y
# CONFIG_MTD_AMDSTD is not set
# CONFIG_MTD_SHARP is not set
# CONFIG_MTD_RAM is not set
CONFIG_MTD_ROM=y
# CONFIG_MTD_JEDEC is not set

#
# Mapping drivers for chip access
#
CONFIG_MTD_PHYSMAP=y
CONFIG_MTD_PHYSMAP_START=ffe00000
CONFIG_MTD_PHYSMAP_LEN=200000
CONFIG_MTD_PHYSMAP_BUSWIDTH=4
# CONFIG_MTD_SUN_UFLASH is not set
# CONFIG_MTD_NORA is not set
# CONFIG_MTD_PNC2000 is not set
# CONFIG_MTD_RPXLITE is not set
# CONFIG_MTD_SC520CDP is not set
# CONFIG_MTD_NETSC520 is not set
# CONFIG_MTD_SBC_GXX is not set
# CONFIG_MTD_ELAN_104NC is not set
# CONFIG_MTD_SA1100 is not set
# CONFIG_MTD_SA1100_REDBOOT_PARTITIONS is not set
# CONFIG_MTD_SA1100_BOOTLDR_PARTITIONS is not set
# CONFIG_MTD_DC21285 is not set
# CONFIG_MTD_IQ80310 is not set
# CONFIG_MTD_DBOX2 is not set
# CONFIG_MTD_CSTM_MIPS_IXX is not set
# CONFIG_MTD_CFI_FLAGADM is not set
# CONFIG_MTD_MIXMEM is not set
# CONFIG_MTD_OCTAGON is not set
# CONFIG_MTD_VMAX is not set
# CONFIG_MTD_ARM is not set

#
# Self-contained MTD device drivers
#
# CONFIG_MTD_PMC551 is not set
# CONFIG_MTD_SLRAM is not set
# CONFIG_MTD_MTDRAM is not set
# CONFIG_MTD_DOC1000 is not set
# CONFIG_MTD_DOC2000 is not set
# CONFIG_MTD_DOC2001 is not set
# CONFIG_MTD_DOCPROBE is not set

#
# NAND Flash Device Drivers
#
# CONFIG_MTD_NAND is not set
# CONFIG_MTD_NAND_SPIA is not set

______________________________________________

Thanks a lot!
zydlason