[U-Boot] no kernel console output !

[tjzkzs]

I use at91sam9260ek board, forgot to mention this. last time I said:

hi all,
when i use u-boot 1.1.5 boot kernel 2.6.22, no kernel console output, development enviorment i use:
cross_compiler: arm-2007-eldk.iso
kernel: 2.6.22
patches: 2.6.22-at91.patch.gz  &  2.6.22-at91-exp.patch.gz
u-boot?u-boot-1.1.5
u-boot patch: u-boot-1.1.5_atmel_1.5.diff.bz2
i got u-boot and the kernel from www.linux4sam.org as well as all patches above. 
u-boot env:
bootdelay=3
baudrate=115200
ethaddr=00:13:20:dc:8b:2b
ipaddr=192.168.118.104
serverip=192.168.118.105
netmask=255.255.255.0
bootargs=mem=64M console=ttyS0 115200 root=/dev/mtdblock1 rootfstype=yaffs2 rw
stdin=serial
stdout=serial
stderr=serial
u-boot output:
U-Boot> bootm 20100000
## Booting image at 20100000 ...
   Image Name:   Linux-2.6.22
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    1394428 Bytes =  1.3 MB
   Load Address: 20008000
   Entry Point:  20008000
   Verifying Checksum ... OK
OK

Starting kernel ...

Uncompressing Linux........................................................................................... done, booting the kernel.
at here, no output anymore,  a problem according to console initialization? the code from atmel and i have checked, no need to change, then about the kernel i use? should i change another kernel version ?  any advise will be appreciated !
Best regards,
Tony Zheng