how to boot hello.exe from floppy disk?

[rtems]

CPU=i386 bsp=pc386
i have built "hello.exe" and use GRUB to boot it from my hard disk successfully, but i can't boot it from one floppy disk.
i download GRUB-0.5.94 to generate stage1 and stage2, use "dd" copy it to one floppy disk, but when i use "root (fd0)", it tell me "unknown file system" ,so i can't copy "hello.exe" to this floppy disk, what should i do next?

thank you

Rick


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