boot A6T stopped at jmp 0x8000:0000

[zhu shi song]

Hi, 
  (1)A6T MB is based on via chipset vt8601/686b
  (2)IPL can successfully copy linuxbios into
0x8000:0000(I have read them out to test this point)
  (3)The first line of linuxbios is to output %al to
port 0x80
  (4)When IPL jumped to 0x8000:0000, the first line of
linuxbios couldn't be executed.  Halted.
   who have met such problem? please help.

tks
   zhu

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