Serial communication between spartan-3 FPGA and mica2 mote over serial ports


can anybody help me with the procedure for connecting the spartan 3 board to a cricket mote through RS232. on the mote side (mica2), programmng to write/ read to/from the RS232 port is done. it is working fine when connected to the PC. i am usind xilinx EDK tool which already provides the UART code for it’s microblaze system. the functions provided work fine too for communication betweeen FPGA and PC (both read and write are working ) . but when i connect it to the mica2 mote. no transfer of data is taking place. Do i need to make some initial configurations other than the normal baud rate settings ???