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关于TCI6638的SRIO的两种模式的一个问题



根据手册上说,SRIO可以选择direct io模式和message passing两种模式,direct io是否不需要CPPI的参与?但是我看direct io的例程中有很大一部分是在配置CPPI,不知道为什么需要配置CPPI呢?