[求助]在ise 7.1下载时出现一个时钟问题怎么解决? ise, 时钟, 下载, 求助, 解决

rabt

请问,我在下载时出现下警告,应怎么处理?换了以前能下载的工程下载也出现这问题,这是怎么的,谢谢!
WARNING:iMPACT:2257 - Startup Clock has been changed to 'JtagClk' in the bitstream stored in memory,
but the original bitstream file remains unchanged.
INFiMPACT:501 - '1': Added Device xc2s30 successfully.