I suggest you use Bochs (http://bochs.sf.net), the i386/PC emulator. Bochs has a built-in debugger but you can also attach a GDB stub to it (see the user documentation). I haven't tried the GDB/Bochs/GRUB combo myself but you should be able to debug GRUB with symbols through GDB.
Thanks for advice. I'll try it.
I'm afraid I don't have time currently to work on this, but if you have questions on GRUB internals just ask, probably someone in the list will help.
I'd like to ask is there any size limit for stage1_5 and stage2?
Do you have any unfinished patches? If you do please send them to the list I'd like to have a look.
When they will be work even a little.
-- Sem.
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