AVR-Chat

Dear all ,
   I use IAR-EW write mega64 Bootloader¡C 

one.) How cloud I set the function address in program memory ?
      like assembly 
        .org bootloader_start ...
         .... 
         [code]
        
two.) If I want write more assembly use IAR-EW compiler how can i do ?
      
  
thanks all.

Luke.