stepping through a flat binary in qemu

[fpga <mgbg25171@blueyonder.co.uk>]

Hi. 
I'm trying to step through a tiny real-to-pmode os in qemu using gdb.

I'm using 
   nasm -f bin emakeimg.asm -o enth.fbin
to assemble the thing and then pasting the 16bit flat binary to a floppy
image
i.e. no debugging symbols.

I've booted the os in qemu with 
"qemu -s -S -fda boot.img -boot a" 
& also without "-s" (use gstabs)

In another terminal I debug the same image and connect to qemu via
"target remote localhost:1234".
If I type "cont" the OS starts to execute.

If I try to step by typing "break" gdb complains about no symbols.
Is it possible to step through this 16 bit bootloader code and into the OS
proper with no symbols & if not what's the easiest way of putting symbols
in.

I have a problem that if I try to assemble as elf, I have multiple [ORG
statements in the code] which only bin files recognise.

Any help much appreciated.

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