I would like to know whether you can debug Xen directly via a serial console 
(like Solaris) or if you need another debug machine (as with FreeBSD and 
Linux)? 

I have connected Xen to a serial console, through which I can see the menu of 
Xen commands (by typing 'h'). Now I want to debug Xen, and the menu says that I 
must type '%': 

(XEN)  key '%' (ascii '25') => Trap to xendbg

When I type '%' now, nothing happens -- I am guessing that's because my Xen is 
not compiled with debugging enabled. After I compile it with debugging enabled, 
will I be able to debug it via my existing serial console connection, after 
typing '%', or will I need to connect to Xen machine to another "debug" machine 
via another serial cable, and connect to gdb on that debug machine?

Thanks!
 
 
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