[ixp1200] WorkBench in HARDWARE Mode?

Hi, Now, I meet problems in using WorkBench in HARDWARE mode. The microcodes have been successfully loaded and ran, but failed to get any packets from the ports. The same examples from Intel, if run out of WorkBench, it can receive packets from the ports; but if run in WorkBench, it fails. I've checked the correspondent registers, eg, RCV_RDY_LO. The value sounded abnormal in the later case. So, does it mean that ports or FBI and like stuffs are not properlly configured in WorkBench. Those honorable veterans, who can give me some hints? Thank in advance! Irvin