NAND boot failed, but ok with NORD

I install the lasted Qtopia 2.2.0 128 MB image.
But when I booting from NAND I've a blank screen, and no output to serial.
If I boot from NORD I've supervivi and I can press B for boot, and all are
ok.
Where is the problem, why the image can't boot directely from NAND ?

Thanks

I have the exact same problem, I've just installed a new kernel (zImage-
trying to active GPIO sys classes)with no change on bootloader and system
file image.
system boots correctly via serial port but dose not work manually...