When I send data to uart, processor must wait UART finish the send. In other platform we can use DMA to reduce the cpu time on data send and receive. How to use DMA to reduce cpu time of powerpc.
The DUART block does not support DMA. Any mentioning about DMA is DUART block description means only "FIFO".
"220.127.116.11 DMA Status Registers (UDSR1 and UDSR2, USDR3 and USDR4)
The DMA status registers (UDSRs), shown in Figure 18-15, return transmitter and receiver FIFO status
and provide the ability to assist DMA data operations to and from the FIFOs." It comes from mpc8306 reference manual.
Any mentioning about DMA is DUART block description means only "FIFO".
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