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Bowen Wang
0d628cfc5b
Add documentation for RPMsg Port UART, a transport layer that enables RPMsg communication between SoCs via UART when shared memory is not available. The documentation covers: - Hardware requirements (UART with flow control) - Software architecture - Escape coding protocol for command/data separation - Connection establishment protocol - Data frame format - Low power support with ping-pong wake mechanism Signed-off-by: Bowen Wang <wangbowen6@xiaomi.com>