Hi Dan,
         Thank
you for help! 
 I have build the xen/ia64
from bk://xen.bkbits.net/xeno-unstable.bk and xenlinux from bk://xen.bkbits.net/xenlinux-ia64-2.6.11.bk
successfully on HP rx5670, RHEL4.
   But still have several “implicit function
declaration” errors when build xen. This is for my gcc version 3.4.3.
    
   cd xeno-unstable-ia64.bk/tools/
   make
 
   When I build xen tools, I encounter some compile
errors. 
   I found no mb(), rmb(), wmb() definition for
__ia64__ in xeno-unstable-ia64.bk/tools/libxc/xc.h.
I copy the definition from ../xen/include/asm-ia64/system.h
   Is it feasible ?
   Next, still error when compile tools/libxc/xc_linux_build.c.
I guess this is for no content of struct vcpu_guest_context in xeno-unstable-ia64.bk/xen/include/public/arch-ia64.h
   Is
it right ?
   
   Is any mistakes I have made or still some
work to do for the xen tools for ia64? 
   I am new to xen, can you show me some detail
steps which I have to take to run multi-domain on my ia64 server.
   Any suggestions is welcome.
 
                                                               Shen
Yuliang
Best Regards