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accessing csp0 thru /dev/mem

I am trying to access csp0 in my user mode app.  I found an example in this mailing list that does open("mem", O_RDWR) (http://mhonarc.axis.se/dev-etrax/msg00930.html).  The problem I am having is that the 'mem' device in not enabled in my developer_lx board.  I would like to know how I can enable it so that I can access the physical memory in the user mode app.
on my developer board I installed software R1_90 with linux version 2.4.20. 
thanks in advance.