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8168中Chains_createBuf创建的buf在a8和dsp之间传递数据大小有限制吗



8168中Chains_createBuf创建的buf在a8和dsp之间传递数据大小有限制吗,

Chains_createBuf(&frames_PhyPtr, &gp_comm, \
&frames_SrPtr, sizeof(comm1), SYSTEM_IPC_SR_NON_CACHED_DEFAULT);位于comm1结构体中数据只有前半部分可以传递成功,后半部分不行,SYSTEM_IPC_SR_NON_CACHED_DEFAULT和SYSTEM_IPC_SR_CACHED分别在什么时候用,求教!!!