In one embodiment, the present invention includes a method for receiving a memory request from a device coupled to an input/output (IO) interconnect, accessing a mapping table associated with the IO interconnect to determine if an address range including an address of the memory request is coherent, and if so, sending the memory request and a coherency indicator to indicate the coherent state of data at the address, otherwise sending the memory request and the coherency indicator to indicate a non-coherent state. Other embodiments are described and claimed.