linux kernel does not bring up!!

["lily" <lichanjuan04@st.lzu.edu.cn>]

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hi,everybody:
     I am a new to embeded linux,my work is to port linux on powerpc , the board i uses is  octobusHPPC405EP .when I power on the board it prints the boot message in minicom as follows :
     U-Boot 1.1.2 (Jun  3 2005 - 12:05:48)

CPU:   IBM PowerPC 405EP Rev. B at 133.333 MHz (PLB=133, OPB=66, EBC=33 MHz)
       IIC Boot EEPROM disabled
       PCI async ext clock used, internal PCI arbiter enabled
       16 kB I-Cache 16 kB D-Cache
OCTOBUS Board: ### No HW ID - assuming OCTOBUS HPPC405
I2C:   ready
DRAM:  32 MB
FLASH:  4 MB
Hit any key to stop autoboot:  0 
## Booting image at ffc00000 ...
   Image Name:   Linux-2.4.21-pre5
   Created:      2005-06-09  13:24:37 UTC
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    550124 Bytes = 537.2 kB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
   Uncompressing Kernel Image ... OK
## Loading RAMDisk Image at ffd00000 ...
   Image Name:   PPCLinux Ramdisk Image
   Created:      2005-06-16   9:15:17 UTC
   Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
   Data Size:    1732209 Bytes =  1.7 MB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
   Loading Ramdisk to 01def000, end 01f95e71 ... OK
id mach(): done
MMU:enter
MMU:hw init
MMU:mapin
MMU:mapin_ram done
MMU:setio
MMU:exit
setup_arch: enter
setup_arch: bootmem
arch:exit

then the system hang .one time the message have difference like:

U-Boot 1.1.2 (Jun  3 2005 - 12:05:48)

CPU:   IBM PowerPC 405EP Rev. B at 133.333 MHz (PLB=133, OPB=66, EBC=33 MHz)
       IIC Boot EEPROM disabled
       PCI async ext clock used, internal PCI arbiter enabled
       16 kB I-Cache 16 kB D-Cache
OCTOBUS Board: ### No HW ID - assuming OCTOBUS HPPC405
I2C:   ready
DRAM:  32 MB
FLASH:  4 MB
Hit any key to stop autoboot:  0 
## Booting image at ffc00000 ...
   Image Name:   Linux-2.4.21-pre5
   Created:      2005-06-09  13:24:37 UTC
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    550124 Bytes = 537.2 kB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
   Uncompressing Kernel Image ... OK
## Loading RAMDisk Image at ffd00000 ...
   Image Name:   PPCLinux Ramdisk Image
   Created:      2005-06-16   9:15:17 UTC
   Image Type:   PowerPC Linux RAMDisk Image (gzip compressed)
   Data Size:    1732209 Bytes =  1.7 MB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
   Loading Ramdisk to 01def000, end 01f95e71 ... OK
id mach(): done
MMU:enter
MMU:hw init
MMU:mapin
MMU:mapin_ram done
MMU:setio
MMU:exit
setup_arch: enter
setup_arch: bootmem
arch:exit
Linux version 2.4.21-pre5 (tzn@linux-tzn) (gcc version 3.2.2 20030217 (Yellow Dog Linux 3.0 3.2.2-2a_1)) #1 Do Jun 9 15:21:40 CEST 2005
DAVE Srl PPChameleonEVB port (C) 2003 DAVE Srl (info@wawnet.biz)
On node 0 totalpages: 8192
zone(0): 8192 pages.
zone(1): 0 pages.
zone(2): 0 pages.
Kernel command line: root=/dev/ram rw ip=192.168.1.2:::255.255.255.0::eth0:off console=ttyS0,115200
Calibrating delay loop... 133.12 BogoMIPS
Memory: 29264k available (1004k kernel code, 324k data, 76k init, 0k highmem)
Dentry cache hash table entries: 4096 (order: 3, 32768 bytes)
Inode cache hash table entries: 2048 (order: 2, 16384 bytes)
Mount cache hash table entries: 512 (order: 0, 4096 bytes)
Buffer-cache hash table entries: 1024 (order: 0, 4096 bytes)
Page-cache hash table entries: 8192 (order: 3, 32768 bytes)
POSIX conformance testing by UNIFIX
PCI: Probing PCI hardware

Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
OCP uart ver 1.6.2 init complete
Starting kswapd
i2c-core.o: i2c core module
pty: 256 Unix98 ptys configured
Serial driver version 5.05c (2001-07-08) with MANY_PORTS SHARE_IRQ SERIAL_PCI enabled
ttyS00 at 0xef600300 (irq = 0) is a 16550A
ttyS01 at 0xef600400 (irq = 1) is a 16550A
PPC 405 watchdog driver v0.6
IBM gpio driver version 07.25.02
GPIO #0 at 0xc3000700
RAMDISK driver initialized: 16 RAM disks of 4096K size 1024 blocksize
loop: loaded (max 8 devices)
eth0: Phy @ 0x1, type STE100P (0x1c040011)
Reset ethernet interfaces
eth1: No PHY device found.
removing net dev
IBM IIC driver
i2c-core.o: adapter IBM IIC adapter registered as adapter 0.
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 2048 bind 4096)
eth0: IBM EMAC: link up, 100 Mbps Half Duplex.
eth0: IBM EMAC: MAC 00:50:c2:1e:af:fe.
eth0: IBM EMAC: open completed

IP-Config: Complete:
      device=eth0, addr=192.168.1.2, mask=255.255.255.0, gw=255.255.255.255,
     host=192.168.1.2, domain=, nis-domain=(none),
     bootserver=255.255.255.255, rootserver=255.255.255.255, rootpath=
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
RAMDISK: Compressed image found at block 0
Freeing initrd memory: 1691k freed
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel memory: 76k init
init started:  BusyBox v0.60.5 (2005.06.06-14:19+0000) multi-call binary
rm: cannot remove `/www/log/seriald_started.log': No such file or directory

but this message just print once ,what's the problem with the board ,does it destroy？
there is somebody give me some suggestion what i do next.Thanks !!

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