=> R0 = 6 (TX buffer) or 7 (RX buffer)
R2 = device driver stream handle
R3 = suggested buffer flags
R4 = suggested buffer size (non-zero)
R5 = suggested buffer handle, or -1 to generate unique handle
R6 = suggested buffer threshold (when halt event is called)
<= R3-R6 modified to driver's requirements
This entry point is called just before the buffer is created, to allow the driver to modify parameters as desired. The suggested buffer flags are those given when the device was registered. R5 will default to -1 (generate unique handle) but you may specify the number of a buffer to link to.
See PRM 2, page 602.
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