serial console no response after print "Transferring control to Linux (at address 00000000)" on PPC860

Dear All:
  I use ppcboot and ELDK 3.1.1 kernel 2.4.25 to boot a PPC860 board, I select the ttyS0, 9600, root=/de/ram during config the kernel.
   I select the SMC1,SMC2 device too. 
  But when bootm 180000, it print the "Transferring control to Linux (at address 00000000)"  then halt. 
  How can I do? Tell me the detail when config the kernel, thanks!