=> R0 = 0
R2 = DeviceFS stream handle
R3 = flags: bit 0 clear for RX, else TX
R4 = FileSwitch stream handle [OS 4.00+]
R6 = pointer to "special field control block"
<= R2 = device driver stream handle
This entry point is called when DeviceFS opens a stream onto the device driver. The stream handle it supplies must be stored, as you need it for DeviceFS SWIs such as DeviceFS_ReceivedCharacter. Your stream handle will be passed to other entry points - 0 is a reserved value, so you may not use this as your handle. The block in R6 will remain intact until the stream closes.
See PRM 2, page 599.
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