XACTstep 5.2.1/6.0.1 can not perform readback with xchecker on 5202 devices.
ソリューション
Current XACTstep 5.2.1/6.0.1 does not support readback with xchecker for 5202. However, readback is supported in the rest of 5200 family. makebits program needs to run with following options:
Makebits -l -f readcapture:enable <design>
Users should understand this is not an architectural problem but a software limitation.