SPEAr320 exception vector

Hi,
  I am working on porting ThreadX to SPEAr320 board. Now I'm stuck with 
exception vector table mapping. As per my study, ARM exception vectors 
are always mapped to 0x0 ( if low end vector mapping is used) or 
0xFFFF0000 ( if high end vector mapping is used).I tried copying 
exception vector table to 0x0 location, but it doesn't work and the 
location 0xFFFF0000 is ROM address, so I can't copy to this location. 
When referred with Linux BSP for SPEAr320, the exception vector table 
has been copied to 0xFFFF0000 and it is mentioned as virtual address. 
There is no virtual memory mapping technique in ThreadX. Now I don't 
know what to do, to handle ARM exceptions. If any body know the solution 
for this problem please let me know..
thanks in advance..