[ESI][BSP] Simple ToHost DMA engine #8207
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Instead of trying to shoehorn all of the engine records into one service record (for the ChannelEngineService), add the capability to emit individual engine records.
When an engine is unknown, throw the error when the user tries to connect rather than during manifest parsing.
Simple, non-performant DMA-based channel communication. Protocol: 1) Host sends address of buffer address via MMIO write. 2) Device writes data on channel with a byte '1' to said buffer address. 3) Host polls the last byte in buffer for '1'. 4) Data is copied out of buffer, last byte is set to '0', goto 1. Future improvement: support more than one buffer at once.
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Simple, non-performant DMA-based channel communication. Protocol:
Future improvement: support more than one buffer at once.