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AM623: 不支持SPI作为从机的原因

Part Number: AM623

3.2.2.14. SPI — Processor SDK AM64X Documentation按照该链接了解到AM6231的SPI不支持从机模式,请问是A核的spi不支持还是M核的spi不支持呢?是所有的spi都不支持作为从机吗?因为什么原因呢?是芯片本身不支持还是没有相关驱动和设备树呢?如果是软件问题能否提供相应的资料呢?