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1. About jz4740 DMA
JZ4740 has 2 groups of DMA, 4 channels in each group. The default prority is channel 0 has the highest priority and channel 7 has the loweset priority.
Channel 0 is used for SLCD and channel 2/3 are used for MMC TX/RX. Because the SLCD DMA is busy transmitting data from frame buffer [...]
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