Syslinux - Mar 2006 - About SYSLINUX stop starting kernel (linux 2.6.15.6)

Hello~

I have a embedded system:CPU=Intel PIII 850 ; RAM=256MB ; Hard Disk=64MB CF; 
original kernel=linux 2.4.21 ; new kernel=linux 2.6.15.6
syslinux.cfg:
SERIAL 0 19200
TIMEOUT 80
DEFAULT linux
PROMPT 1
LABEL linux
        KERNEL linux
        APPEND console=tty0 console=ttyS0,19200n8 root=/dev/ram0 
initrd=image.gz
LABEL linux26
        KERNEL linux26
        APPEND console=tty0 console=ttyS0,19200n8 root=/dev/ram0 
initrd=image.gz
When I select boot:linux  ...I can boot the machine and work fine...
But  if I select boot:linux26  ...my new kernel can not be start

SYSLINUX 3.11 2005-09-02  Copyright (C) 1994-2004 H. Peter Anvin
boot:linux26
Loading linux26....................
Loading
image.gz...................................................................................................
Ready.

I took the new kernel image to other PIII PC + lilo but I can boot it...
Anyone know how to resolve it?

Thanks,
   -Brian Lu