为什么u-boot启动内核会失败？

开发板很久没用了，用nandflash的U-boot启动内核失败，然后自动重启U-boot,串口打印如下内容，求大神帮忙看看是什么问题

Reading data from 0x25f800 -- 100% complete.
2097152 bytes read: OK
## Booting image at 30007fc0 ...
   Image Name:   Linux-2.6.22.6
   Created:      2013-08-23   7:33:38 UTC
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    1848668 Bytes =  1.8 MB
   Load Address: 30008000
   Entry Point:  30008000
   Verifying Checksum ... OK
   XIP Kernel Image ... OK

Starting kernel ...

Uncompressing Linux...................................................................................................................... done, booting the kernel.
Linux version 2.6.22.6 (book@book-desktop) (gcc version 3.4.5) #1 Fri Aug 23 15:33:35 CST 2013
CPU: ARM920T [41129200] revision 0 (ARMv4T), cr=c0007177
Machine: SMDK2440
Memory policy: ECC disabled, Data cache writeback
CPU S3C2440A (id 0x32440001)
S3C244X: core 400.000 MHz, memory 100.000 MHz, peripheral 50.000 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=/dev/mtdblock3 init=/linuxrc console=ttySAC0
irq: clearing pending ext status 00080000
irq: clearing subpending status 00000003
irq: clearing subpending status 00000002
PID hash table entries: 256 (order: 8, 1024 bytes)
timer tcon=00500000, tcnt a2c1, tcfg 00000200,00000000, usec 00001eb8
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: 60976KB available (3264K code, 458K data, 140K init)
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
NET: Registered protocol family 16
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
SCSI subsystem initialized
u***core: registered new interface driver u***fs
u***core: registered new interface driver hub
u***core: registered new device driver u***
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 2048 (order: 2, 16384 bytes)
TCP bind hash table entries: 2048 (order: 1, 8192 bytes)
TCP: Hash tables configured (established 2048 bind 2048)
TCP reno registered
NetWinder Floating Point Emulator V0.97 (double precision)
Registering GDB sysrq handler
JFFS2 version 2.2. (NAND) 漏 2001-2006 Red Hat, Inc.
yaffs Aug 23 2013 15:33:07 Installing.
io scheduler noop registered
io scheduler anticipatory registered (default)
io scheduler deadline registered
io scheduler cfq registered


U-Boot 1.1.6 (Nov 26 2010 - 08:49:16)

DRAM:  64 MB
Flash:  0 kB
NAND:  256 MiB
In:    serial
Out:   serial
Err:   serial
UPLLVal [M:38h,P:2h,S:2h]
MPLLVal [M:5ch,P:1h,S:1h]
CLKDIVN:5h