help needed for bootstrap

["YU Tang" <squalls_tang at 263 dot net>]

hi,
i met some problems when i tried to make a simple PC
bootstrap program with gas,i believe someone here can help
me ;-)
and here is the code:

        .globl  start

start:  jmp     main
        .org    0x4,0x90

main:
        movb    $0x4c,%al       ; char 'L'
        movb    $0xe,%ah        ; vedio fucntion
        movb    $0x4c,%al       ; char 'L'
        movb    $0xe,%ah        ; vedio fucntion
        movw    $0x7,%bx        ; color
        int     $0x10           ; go
hang:
        jmp     hang            ; hang here

        .org    0x1FE,0x90      ; fill up
        .word   0xAA55          ; magic

[END OF FILE]

and run
#as hello.s -o hello.o
#ld -nostdlib -static -N -e start -Ttext 0x7C00 hello.o -o hello.out
#objcopy -S -O binary hello.out hello.bin
#dd if=./hello.bin of=/dev/fd0 bs=512 count=1

and reboot with floppy injected.
but it just hang here,and no output!!
(It should output 'L' first)
BTW, I did it under FreeBSD

Thanks!

Tang YU


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