Urgent!!! Need help!!! continue the question about etherboot

Hello,

   I still can't make PXE boot with etherboot.
   After some debug, I found that
   1) load.S has been called by BIOS. But after compare the header with 
"$PnP", the code just returned to BIOS and do nothing else.
   2)When BIOS get the control, it never call the etherboot anymore, The 
code start16.S has never been executed.

    Could somebody give me some idea about how to solve the problem?

  I feel very strange, according to the PXE data sheet, the EEPROM binary 
code should hook INT 18 or INT 19, but it seems the startup code of the 
etherboot hasn't done anything and just return to BIOS after a simple 
comparation. Could someone give me an idea about how etherboot work with 
device with PNP header?

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