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专家您好，8148dvr-rdk中spi发送只有IO方式的代码，因为此方式达不到性能要求，想采用DMA方式，请问有没有相关的文档和代码？
Utils_dmaCopy2D
DVRRDK_04.01.00.02\dvr_rdk\mcfw\src_bios6\utils\src\utils_dma.c.
