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6678PCIE调试问题

我在调试一块6678的板卡,和FPGA之间通过PCIE相连,FPGA是ALTERA的S4,DSP能够读到FPGA的配置空间信息,也能配置BAR的基址寄存器,但是访问存储区空间时感觉没有响应,FPGA端也看不到任何访问,DSP也没东西。参照例子对照过outbound的寄存器配置,没什么问题,不知道原因在哪。