A new device path node is defined to declare flow control characteristics. UART Flow Control Messaging Device Path
Bitmap of supported flow control types. Bit 0 set indicates hardware flow control. Bit 1 set indicates Xon/Xoff flow control. All other bits are reserved and are clear.
DEVICE_PATH_MESSAGING_UART_FLOW_CONTROL GUID.
See Implementation
A new device path node is defined to declare flow control characteristics. UART Flow Control Messaging Device Path