I am sending a lot of single-token packets and this would significantly improve the payload efficiency.
I assume link-booting is hardwired to expect 3-byte headers?
When a circuit is opened to a channel-end on a remote tile, the xCORE will create a
header and transmit this header to the switch prior to transmitting the first token.
The header comprises either a single byte or three bytes. The latter is the default
mode, the former is an optimized mode for small systems. In order to select 1-byte
mode, all nodes in the system should be set to generate and expect 1-byte headers
by writing to the Switch configuration register of the node on all nodes.