Now I may be way off here, but I though that perhaps the tab character  

in front of

VIRT_BASE here may cause it to not be recognized by xenelf. I joined  

it into one line,

and I am rewarded with a different error message:

"xc_dom_alloc_segment: segment start isn't page aligned".

I really don't know if this is better or worse. I'm just poking around  

at random trying

to figure all of this out :-)

sounds better.  what's $KTZERO?

- erik