| oh,the problem now resloved. i use "chainload" instead of "kernel" and write the menu.lst of grub as 
follwed: “title netbsd 4.0 root (hd0,2) chainloader +1 boot ” then it runs ok. but when i use the "makeactive" command as folllowed: "title netbsd 
4.0--1 rootnoverity (hd0,2) makeactive chainloader +1 boot" 
 it returns "invalid deviece command requested",i don't know why. 2008-01-07 
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