求助文件系统启动问题

我的开发板是arm9200t，内核就采用了arm9200的默认配置，然后配置了BLocK_RAM_SIZE (819255)，ramdisk size设为 15360,command string: "mem=32M console=ttyS0,115200 initrd=0x21100000,6000000 root=/dev/ram rw"编译成功后，使用串口下载到flash中，ram大小为32Mflash16M，使用下面命令下载内核和文件系统，但是好像启动的不正常！
内核
Uboot> loadb 21000000
Uboot>protect off all
Uboot>erase 10020000 1013ffff  
Uboot>cp.b 21000000  10020000  11ffff
Uboot>protect on all
文件5, 烧写ramdisk(文件系统)
Uboot> loadb 21100000
Uboot>protect off all
Uboot>erase 10140000 1053ffff    
Uboot>cp.b 21100000 10140000 3fffff
Uboot>protect on all
环境变量
Uboot> setenv cpfltoker cp.b 10020000 21000000 11ffff
Uboot> setenv cpfltoram cp.b 10140000 21100000 3fffff
Uboot> setenv boot go 21000000
Uboot> setenv bootcmd run cpfltoker\;run cpfltoram\;run boot
Uboot> setenv bootargs root=/dev/ram rw initrd=0x21100000,6000000 ramdisk_size=20000 console=ttyS0,115200 mem=32M
Uboot> saveenv
下面是打印的调试信息各位大虾帮我看看吧
boot 1.0 (Jun 28 2005 - 10:55:27)
Uncompressing image...
U-Boot 1.1.1 (Aug  3 2005 - 14:31:02)

U-Boot code: 21F00000 -> 21F15C30  BSS: -> 21F19F84
RAM Configuration:
Bank #0: 20000000 32 MB
Flash: 16 MB
In:    serial
Out:   serial
Err:   serial
Hit any key to stop autoboot:  3  2  1  0
## Starting application at 0x21000000 ...
Uncompressing Linux.................................................................... done, booting the kernel.
Linux version 2.6.21.3 (root@lihongyu) (gcc version 3.4.1) #9 Wed Jul 25 17:16:19 CST 2007
CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177
Machine: Atmel AT91RM9200-DK
Warning: bad configuration page, trying to continue
Memory policy: ECC disabled, Data cache writeback
Clocks: CPU 179 MHz, master 59 MHz, main 18.432 MHz
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: 8128
Kernel command line: mem=32M console=ttyS0,115200 initrd=0x21100000,6000000 root=/dev/ram rw
AT91: 128 gpio irqs in 4 banks
PID hash table entries: 128 (order: 7, 512 bytes)
Console: colour dummy device 80x30
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
Memory: 32MB = 32MB total
Memory: 24424KB available (1872K code, 183K data, 100K init)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
NET: Registered protocol family 16
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 1024 (order: 1, 8192 bytes)
TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
TCP: Hash tables configured (established 1024 bind 1024)
TCP reno registered
checking if image is initramfs...it isn't (bad gzip magic numbers); looks like an initrd
Freeing initrd memory: 5859K
NetWinder Floating Point Emulator V0.97 (double precision)
io scheduler noop registered
io scheduler anticipatory registered (default)
at91_spi: Baud rate set to 5990400
AT91 SPI driver loaded
AT91 Watchdog Timer enabled (5 seconds, nowayout)
atmel_usart.0: ttyS0 at MMIO 0xfefff200 (irq = 1) is a ATMEL_SERIAL
atmel_usart.1: ttyS1 at MMIO 0xfffc4000 (irq = 7) is a ATMEL_SERIAL
RAMDISK: wrong blocksize 819255, reverting to defaults
RAMDISK driver initialized: 16 RAM disks of 15360K size 1024 blocksize
at91_ether: probe of at91_ether failed with error -1
physmap platform flash device: 00200000 at 10000000
physmap-flash.0: Found 1 x16 devices at 0x0 in 16-bit bank
NOR chip too large to fit in mapping. Attempting to cope...
Support for command set 0001 not present
gen_probe: No supported Vendor Command Set found
physmap-flash physmap-flash.0: map_probe failed
at91_cf: irqs det #64, io #0
usbmon: debugfs is not available
at91_ohci at91_ohci: AT91 OHCI
at91_ohci at91_ohci: new USB bus registered, assigned bus number 1
at91_ohci at91_ohci: irq 23, io mem 0x00300000
usb usb1: Product: AT91 OHCI
usb usb1: Manufacturer: Linux 2.6.21.3 ohci_hcd
usb usb1: SerialNumber: at91
usb usb1: configuration #1 chosen from 1 choice
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 2 ports detected
udc: at91_udc version 3 May 2006
mice: PS/2 mouse device common for all mice
at91_rtc at91_rtc: rtc core: registered at91_rtc as rtc0
i2c /dev entries driver
at91_i2c at91_i2c: AT91 i2c bus driver.
TCP cubic registered
NET: Registered protocol family 1
NET: Registered protocol family 17
at91_rtc at91_rtc: setting the system clock to 1998-01-01 00:00:28 (883612828)
RAMDISK: Couldn't find valid RAM disk image starting at 0.
No filesystem could mount root, tried:  ext2 cramfs
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(1,0)
希望各位大人指点迷津！

楼主问题解决了吗