AN_SC1x3_Design_Guide_V10.PDF
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7. COM0/COM1 for prototype boards
If you don’t need any serial port, even though connect COM1 to a simple
minature connector. The connector has only be placed on the first few
prototype boards.
If the design has a bug and no ethernet connection can be established,
COM1 is a easy and simple way to watch some debug information (boot
message, etc.).
Better you use COM1 and COM0. Through COM0 you can always update
your RTOS Version.
You can choose the bootloader interface for the serial port (see HW Manual,
chapter Startup Configuration).