Hi,
when I boot linux with UBoot on my custom board, nothing but it hangs there.
The following is the output infomation throught serial port.
What's the most probable cause of this problem?
Thank you for your advices.

regards
Hai gao

### main_loop: bootcmd="bootp 1000000; setenv bootargs root=ramfs console=ttyS00
,9600 ip=$(ipaddr):$(serverip):$(rootpath):$(gatewayip):$(netmask):$(hostname):e
th0:none; bootm"
=>
=> tftpboot 0x1000000 vmlinux.UBoot
Trying i82559#0
Using i82559#0 device
TFTP from server 10.71.58.94; our IP address is 10.71.58.110
Filename 'vmlinux.UBoot'.
Load address: 0x1000000
Loading: #################################################################
          #################################################################
done
Bytes transferred = 664908 (a254c hex)
=> printenv
bootcmd=bootp 1000000; setenv bootargs root=ramfs console=ttyS00,9600 ip=$(ipadd
r):$(serverip):$(rootpath):$(gatewayip):$(netmask):$(hostname):eth0:none; bootm
baudrate=38400
loads_echo=1
ethaddr=00:00:5b:ee:de:ad
ethact=i82559#0
bootdelay=-1
stdin=serial
stdout=serial
stderr=serial
filesize=a254c
fileaddr=1000000
ipaddr=10.71.58.110
serverip=10.71.58.94

Environment size: 357/16380 bytes
=> imi 0x1000000

## Checking Image at 01000000 ...
   Image Name:   Linux-2.4.24-pre2
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    664844 Bytes = 649.3 kB
   Load Address: 00000000
   Entry Point: 00000000
   Verifying Checksum ... OK
=> bootm 0x1000000

Booting progress->[0x1       ]## Booting image at 01000000 ...

Booting progress->[0x2       ]
Booting progress->[0x3       ]   Image Name:   Linux-2.4.24-pre2
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    664844 Bytes = 649.3 kB
   Load Address: 00000000
   Entry Point: 00000000
   Verifying Checksum ... OK

Booting progress->[0x4       ]
Booting progress->[0x5       ]
Booting progress->[0x6       ]   Uncompressing Kernel Image ... OK

Booting progress->[0x7       ]
Booting progress->[0x8       ]## Current stack ends at 0x0FFB1BB8 => set upper l
imit to 0x00800000
## cmdline at 0x007FFF00 ... 0x007FFF00
bd address = 0x0FFB1FC8
memstart    = 0x00000000
memsize     = 0x10000000
flashstart = 0xFF000000
flashsize   = 0x00800000
flashoffset = 0x00000000
sramstart   = 0x00000000
sramsize    = 0x00000000
bootflags   = 0x00000001
intfreq     = -165.-993 MHz
busfreq     =     99 MHz
ethaddr     = 00:00:5B:EE:DE:AD
IP addr     = 10.71.58.110
baudrate    = 38400 bps

Booting progress->[0xe       ]No initrd
## Transferring control to Linux (at address 00000000) ...

Booting progress->[0xf       ]