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[Xen-devel] Issue about interrupt in i8259

Dear all,
    When I start Gos(winxp or vista), I find sometimes a1 and 21 port in
8259 receive data  "FF" and sometimes not. Somebody can help me to explain
this, and also, why Gos(winxp or vista) will send "FF" to a1 or 21 port.
Thanks all!
Best Regards
 宋 伟 ( James.Song)                                           
 Senior Develop Enigneer songweia@xxxxxxxxxx                   
 Trusted Computing Lab   +86-10-58866632/1066                  
 Lenovo Corporate R&D                                          
 Post Code 100085                                              
 Post Office Box 8688                                          
 No. 6 Shangdi Di West                                         
 Haidian District,                                             
 Beijing, China                                                
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