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求助,关于pru-icss和firmware

335x  ice的板子,要在linux下驱动pru实现ethercat_slave,看了几遍ti的processor   SDK.,大致了解了pru的工作原理,是相应的firmware在pru上运行,同时有好多问题,这个firmware是不是就是个驱动程序?那和ethercat_slave 相应的firmware在哪能找到?然后用户程序写在哪里?写在firmware里面吗?比如我根据接收到的信息来决定gpio的高低电平?那个在TI RTOS上跑的例程,能不能经过修改在linux下运行?望高人指点,跪了跪了!!