Uboot nand 错误。急需请教！！！！！！！

あほ↘緈鍢僾

通过DNW + USB, 将uboot下载到RAM，后启动暂时的uboot.
无论是输入nand scurb 还是在 fastboot下 向ROM中再次烧写uboot.
都提示  no devices available.

为什么NAND  显示 0 MB

DNW输出信息如下：
1.
U-Boot 1.3.4-dirty (Nov 15 2012 - 16:29:10) for x210



CPU:  S5PV210@1000MHz(OK)

        APLL = 1000MHz, HclkMsys = 200MHz, PclkMsys = 100MHz

        MPLL = 667MHz, EPLL = 96MHz

                       HclkDsys = 166MHz, PclkDsys = 83MHz

                       HclkPsys = 133MHz, PclkPsys = 66MHz

                       SCLKA2M  = 200MHz

Serial = CLKUART

Board:   X210

DRAM:    512 MB

Flash:   8 MB

SD/MMC: 3800MB

NAND:    0 MB

*** Warning - using default environment


In:      serial

Out:     serial

Err:     serial

Enter into Normal mode

Hit any key to stop autoboot:  0

x210 # nand scrub


no devices available


2.
x210 # fastboot

Fastboot: employ default partition information

[Partition table on NAND]

ptn 0 name='bootloader' start=0x0 len=0x100000(~1024KB)

ptn 1 name='recovery' start=0x100000 len=0x500000(~5120KB)

ptn 2 name='kernel' start=0x600000 len=0x500000(~5120KB)

ptn 3 name='ramdisk' start=0xB00000 len=0x300000(~3072KB)

ptn 4 name='system' start=0xE00000 len=0x8200000(~133120KB) (Yaffs)

ptn 5 name='cache' start=0x9000000 len=0x3C00000(~61440KB) (Yaffs)

ptn 6 name='userdata' start=0xCC00000 len=N/A (Yaffs)

Received 17 bytes: download:00070000

Starting download of 458752 bytes


downloading of 458752 bytes finished

Received 16 bytes: flash:bootloader

flashing 'bootloader'


no devices available


no devices available

flashing 'bootloader' failed