watchpoint question

[Sinbad]

hi, 
 I want to break whenever the value of a memory location changes. 
 For example there is a variable var @ location 0x102030. 
 i want to break whenever the value at 0x102030 changes, 
 how can i do this, the fact is that 'var' can be accessed 
 at several random locations in my code. I tired using the watchpoint, 
 But I am getting the following error,

"Can't clear hardware watchpoints without the 'Z2' (write-watchpoint)
packet."

By the way I am doing remote debugging.

Am i missing something here.

thanks 
 sinbad