when i use a 2.6.13kernel, it can go though  finally mount rootfs and run busybox
but i try to use 2.6.22.12(without devfs) instead ,it comes those words

VIVI version 0.1.4 (root@vmwarelinux) (gcc version 2.95.3 20010315 (release)) #0.1.4 Mon May 14 15:46:54 CST 2007
MMU table base address = 0x33DFC000
Succeed memory mapping.
DIVN_UPLL0
MPLLVal [M:7fh,P:2h,S:1h]
CLKDIVN:5h


+-----------------------------------------------------+
|  FriendlyARM SBC2440/QQ2440  USB Downloader ver1.2  |
+-----------------------------------------------------+
USB: IN_ENDPOINT:1 OUT_ENDPOINT:3
FORMAT: <ADDR(DATA):4>+<SIZE(n+10):4>+<DATA:n>+<CS:2>
NOTE: Power off/on or press the reset button for 1 sec
      in order to get a valid USB device address.

NAND device: Manufacture ID: 0xec, Chip ID: 0x76 (Samsung K9D1208V0M)
Found saved vivi parameters.
Press Return to start the LINUX/Wince now, any other key for vivi
Copy linux kernel from 0x00050000 to 0x30008000, size = 0x00200000 ... done
zImage magic = 0x016f2818
Setup linux parameters at 0x30000100
linux command line is: "noinitrd root=31:2 init=/linuxrc console=ttySAC0"
MACH_TYPE = 782
NOW, Booting Linux......
Uncompressing Linux.................................................................. done, booting the kernel.
Linux version 2.6.22.12 (elzo@elzo-laptop) (gcc version 4.2.1 (CodeSourcery Sourcery G++ Lite 2007q3-51)) #1 PREEMPT Thu Nov 22 21:14:25 CST 2007
CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177
Machine: SMDK2440
ATAG_INITRD is deprecated; please update your bootloader.
Memory policy: ECC disabled, Data cache writeback
CPU S3C2440A (id 0x32440001)
S3C244X: core 405.000 MHz, memory 101.250 MHz, peripheral 50.625 MHz
S3C24XX Clocks, (c) 2004 Simtec Electronics
CLOCK: Slow mode (1.500 MHz), fast, MPLL on, UPLL on
CPU0: D VIVT write-back cache
CPU0: I cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets
CPU0: D cache: 16384 bytes, associativity 64, 32 byte lines, 8 sets
Built 1 zonelists.  Total pages: 16256
Kernel command line: noinitrd root=31:2 init=/linuxrc console=ttySAC0
irq: clearing pending ext status 00000200
irq: clearing subpending status 00000002
PID hash table entries: 256 (order: 8, 1024 bytes)
timer tcon=00000000, tcnt a4ca, tcfg 00000200,00000000, usec 00001e57
Console: colour dummy device 80x30
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 64MB = 64MB total
Memory: 62744KB available (1812K code, 193K data, 88K init)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
S3C2410 Power Management, (c) 2004 Simtec Electronics
S3C2440: Initialising architecture
S3C2440: IRQ Support
S3C2440: Clock Support, DVS off
S3C24XX DMA Driver, (c) 2003-2004,2006 Simtec Electronics
DMA channel 0 at c4800000, irq 33
DMA channel 1 at c4800040, irq 34
DMA channel 2 at c4800080, irq 35
DMA channel 3 at c48000c0, irq 36
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
NetWinder Floating Point Emulator V0.97 (double precision)
fuse init (API version 7.8)
yaffs Nov 22 2007 21:09:59 Installing.
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler deadline registered
io scheduler cfq registered
s3c2410-lcd s3c2410-lcd: invalid bpp 16
Console: switching to colour frame buffer device 30x40
fb0: s3c2410fb frame buffer device
lp: driver loaded but no devices found
ppdev: user-space parallel port driver
S3C2410 Watchdog Timer, (c) 2004 Simtec Electronics
Serial: 8250/16550 driver $Revision: 1.90 $ 4 ports, IRQ sharing enabled
s3c2440-uart.0: s3c2410_serial0 at MMIO 0x50000000 (irq = 70) is a S3C2440
s3c2440-uart.1: s3c2410_serial1 at MMIO 0x50004000 (irq = 73) is a S3C2440
s3c2440-uart.2: s3c2410_serial2 at MMIO 0x50008000 (irq = 76) is a S3C2440
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
loop: module loaded
S3C24XX NAND Driver, (c) 2004 Simtec Electronics
s3c2440-nand s3c2440-nand: Tacls=1, 9ns Twrph0=4 39ns, Twrph1=1 9ns
lxr,2440
NAND device: Manufacturer ID: 0xec, Chip ID: 0x76 (Samsung NAND 64MiB 3,3V 8-bit)
NAND_ECC_NONE selected by board driver. This is not recommended !!
Scanning device for bad blocks
Creating 3 MTD partitions on "NAND 64MiB 3,3V 8-bit":
0x00000000-0x00030000 : "bootloader"
mtd: Giving out device 0 to bootloader
0x00050000-0x00250000 : "kernel"
mtd: Giving out device 1 to kernel
0x00250000-0x03ffc000 : "root"
mtd: Giving out device 2 to root
lxr,initialised ok
s3c2410-ohci s3c2410-ohci: S3C24XX OHCI
s3c2410-ohci s3c2410-ohci: new USB bus registered, assigned bus number 1
s3c2410-ohci s3c2410-ohci: irq 42, io mem 0x49000000
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
mice: PS/2 mouse device common for all mice
S3C24XX RTC, (c) 2004,2006 Simtec Electronics
s3c2440-i2c s3c2440-i2c: slave address 0x10
s3c2440-i2c s3c2440-i2c: bus frequency set to 98 KHz
s3c2440-i2c s3c2440-i2c: i2c-0: S3C I2C adapter
drivers/rtc/hctosys.c: unable to open rtc device (rtc0)
yaffs: dev is 32505858 name is "mtdblock2"
yaffs: passed flags ""
yaffs_read_super: Using yaffs1
yaffs_read_super: block size 4096
yaffs: Attempting MTD mount on 31.2, "mtdblock2"
 erase c013cab0
 read c013ce4c
 write c013c8a0
 readoob c013cd88
 writeoob c013c950
 block_isbad c013ccc4
 block_markbad c013cd14
 writesize 512
 oobsize 16
 erasesize 16384
 size 64667648
yaffs: yaffs_GutsInitialise()
yaffs_Scan starts  intstartblk 1 intendblk 3947...
Block scanning block 1 state 3 seq 0
Block empty
Block scanning block 2 state 2 seq 0
Block scanning block 3 state 2 seq 0
Block scanning block 4 state 2 seq 0
Block scanning block 5 state 2 seq 0

.......

Block scanning block 826 state 2 seq 0
Block scanning block 827 state 2 seq 0
Block scanning block 828 state 3 seq 0
Block empty
Block scanning block 829 state 3 seq 0
Block empty

.......

Block scanning block 3947 state 3 seq 0
Block empty
yaffs_Scan ends
yaffs: yaffs_GutsInitialise() done.

yaffs_read_super: guts initialised OK
yaffs_read_super: got root inode
yaffs_read_super: d_alloc_root done
yaffs_read_super: done
VFS: Mounted root (yaffs filesystem).
Freeing init memory: 88K
Warning: unable to open an initial console.
Failed to execute /linuxrc.  Attempting defaults...
Kernel panic - not syncing: No init found.  Try passing init= option to kernel.

how can I mount the rootfs?

I configed sysfs and all the options under "pseudo file system"

configed "do own ecc" and make driver/mtd/nand/s3c2410.c: ecc.mode=nand_ecc_none

also mknod console zero null

but what's the problem?