[syslinux] About create usb-boot freedos with syslinux.

[heping]

About create usb-boot freedos with syslinux.

i want create a usb-boot disk, the os is freedos and the os loader is syslinux,i do it under debian, below is what i did:

1 mkdosfs /dev/sda1 (this is my usb card)
2 syslinux /dev/sda12
3 mount /dev/sda1 /tmpusb -t msdos
4 dd if=/dev/fd0 of=/dos.bss bs=512 count=1
5 cp /dos.bss /tmpusb
6 mount /dev/fd0 /tmpfd -t msdos
(the floppy disk is the freedos diskette,and i have created  
7 cp /tmpfd/{kernel.sys command.com} /tmpusb
8 cd /tmpusb
9 edit syslinux.cfg:
   default freedos
   prompt 1
   timeout 30
   label freedos
   kernel dos.bss

but when i boot it ,i get only two line of dot, such as 
.
.....

what is the problem?
who can help me? thanks in advance.

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