c674x DMA writes code to L2 SRAM that is then executed by the CPU

在DSPC674X上有这么一段：DMA writes code to L2 SRAM that is then executed by the CPU (this case is supported by the hardware protocol on C621x/C671x and C64x DSPs, but is not supported on C674x DSPs).
在以往的C64X平台， 我们是用DMA利用PING-PONG操作将数据读入L2RAM，然后CPU处理来节省数据读入Cache的时间，但是现在C674X平台不支持DMA拷入L2RAM，然后CPU再处理，该如何处理可以使用DMA传递数据然后CPU操作来像在C64X平台那样操作来达到从而节省数据读入Cache的时间呢？